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The Marshall Star for June 26, 2024


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The Marshall Star for June 26, 2024

NASA Marshall Space Flight Center Director Joseph Pelfrey, second from left, presented Huntsville Mayor Tommy Battle, third from left, with an Artemis I Certificate of Appreciation during NASA in the Park on June 22 at Huntsville’s Big Spring Park East. They are joined by Larry Leopard, Marshall associate director, technical, far left, and Rae Ann Meyer, Marshall deputy director.

Blasting into Summer: Thousands Enjoy NASA in the Park

By Wayne Smith

It was a super Saturday in the park to celebrate space and the Rocket City.

NASA’s Marshall Space Flight Center joined Downtown Huntsville Inc. and other community partners to host NASA in the Park, a public outreach event that attracted thousands to Big Spring Park East in Huntsville on June 22.

NASA Marshall Space Flight Center Director Joseph Pelfrey, second from left, presented Huntsville Mayor Tommy Battle, third from left, with an Artemis I Certificate of Appreciation during NASA in the Park on June 22 at Huntsville’s Big Spring Park East. They are joined by Larry Leopard, Marshall associate director, technical, far left, and Rae Ann Meyer, Marshall deputy director.
NASA Marshall Space Flight Center Director Joseph Pelfrey, second from left, presented Huntsville Mayor Tommy Battle, third from left, with an Artemis I Certificate of Appreciation during NASA in the Park on June 22 at Huntsville’s Big Spring Park East. They are joined by Larry Leopard, Marshall associate director, technical, far left, and Rae Ann Meyer, Marshall deputy director.
NASA/Charles Beason

And the reach of the event may go far beyond North Alabama in the years ahead, according to Huntsville Mayor Tommy Battle.

“Marshall Space Flight Center is the soul of space exploration,” said Battle, who was presented with an Artemis I Certificate of Appreciation by Marshall Director Joseph Pelfrey at the event. “Huntsville is proud of NASA’s leadership in space, and it was exciting for locals to see all of Marshall’s cool projects on display at NASA in the Park. Seeing thousands of people, particularly young people, engaged at the event shows the enthusiasm for space and science. This event may have inspired a future astronaut or scientist who will take man back to the Moon, and one day to Mars.”

Visitors to NASA in the Park get some relief from the heat underneath shade trees surrounding the canal that runs through Big Spring Park.
Visitors to NASA in the Park get some relief from the heat underneath shade trees surrounding the canal that runs through Big Spring Park.
NASA/Charles Beason

Attendees of all ages packed the park to enjoy NASA exhibits and science demonstrations, giveaways, food vendors, and live music at the event, which was from 10–2 p.m. About 14,000 people attended, according to official estimates. The greenspace in the heart of Huntsville offered a welcome respite from temperatures that reached the upper 90s on the first Saturday of summer.

An RS-25 engine display attracts visitors during NASA in the Park. The display was one of several exhibits at Big Spring Park East highlighting NASA missions.
An RS-25 engine display attracts visitors during NASA in the Park. The display was one of several exhibits at Big Spring Park East highlighting NASA missions.
NASA/Charles Beason

“Thank you to all our Marshall team members who helped make this year’s NASA in the Park a huge success,” said Marshall Director Joseph Pelfrey. “It was truly incredible to see the overwhelming support and participation we received from our partners in government, industry, academia, and the community.”

Marshall Director Joseph Pelfrey, left, interviews NFL quarterback Joshua Dobbs at NASA in the Park. In addition to his football career, Dobbs has an aerospace engineering degree and is engaged in STEM outreach through his foundation, ASTROrdinary.
Marshall Director Joseph Pelfrey, left, interviews NFL quarterback Joshua Dobbs at NASA in the Park. In addition to his football career, Dobbs has an aerospace engineering degree and is engaged in STEM outreach through his foundation, ASTROrdinary.
NASA/Charles Beason

The exhibits at the park included NASA’s SLS (Space Launch System) Program, which is managed by Marshall, the RS-25 engine that will power the rocket, and the Human Landing System, which is also managed by Marshall.

Visitors to NASA in the Park participate in a game of cornhole in front of a display featuring Artemis and NASA’s SLS (Space Launch System).
Visitors to NASA in the Park participate in a game of cornhole in front of a display featuring Artemis and NASA’s SLS (Space Launch System).
NASA/Charles Beason

Smith, a Media Fusion employee and the Marshall Star editor, supports the Marshall Office of Communications.

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SLS Spotlight: Getting Ready for the First Crewed SLS Flights for Artemis

The featured business unit for June at NASA’s Marshall Space Flight Center is SLS. Building off the legacies of the Mercury-Redstone rocket, mighty Saturn V, and the space shuttle, teams at Marshall are preparing for the first crewed missions under the agency’s Artemis campaign with NASA’s SLS (Space Launch System) rocket. Marshall manages the SLS Program.

Marshall teams are finishing outfitting and integration work on the major adapters for the SLS Block 1 configuration that will launch Artemis II and Artemis III. Beginning with Artemis IV, SLS will evolve into a larger, more powerful configuration called Block 1B. Already, development, test, manufacturing, and operation teams across Marshall – and across the country – are readying for its debut flight.

Learn more about SLS.

Below, meet some of the Marshall teammates who are working on the mega rocket.

Lauren Fisher stands in front of the launch vehicle stage adapter for NASA’s SLS (Space Launch System) rocket.

Structural materials engineer Lauren Fisher stands in front of the launch vehicle stage adapter for the SLS rocket. The hardware will be used for the agency’s Artemis III mission that will land astronauts on the lunar surface. Being part of the Artemis Generation is incredibly inspiring for Fisher, who takes pride in her work supporting the first three Artemis missions, including Artemis II, the first crewed mission under Artemis, in 2025. “I’m literally building the hardware that will send the first woman to deep space,” Fisher said. “Watching our rocket take shape, I’m like ‘you see that thing? I did that; that’s mine. See that one? My team did that one. We did that, and see this?’” She beams with pride. “You can do that, too. Just being a part of the generation that’s changing the workforce and changing the space program – it gives me goosebumps.” (NASA/Sam Lott)

Bruce Askins

Bruce Askins desire to explore other worlds always made him want to be an astronaut. Though he did not become an astronaut, Askins has built a 42-year career at NASA, and, as the infrastructure management lead for NASA’s SLS Program at Marshall, Askins is an integral part for the next generation of explorers. Askins and his team are the gatekeepers and protectors of data and responsible for both cybersecurity and physical security for the SLS Program. Under Askins’ leadership, his team ensures all data is stored properly, that information about the rocket shared outside NASA is done with proper data markings, and access is given to those that need it. (NASA/Sam Lott)

Casey Wolfe.
Casey Wolfe.

Casey Wolfe, a Huntsville native, joined Marshall first as a Pathways intern in 2012. Now the assistant branch chief of the advanced manufacturing branch within the Materials and Processing Laboratory at Marshall, Wolfe and her branch support Artemis through composites and additive manufacturing work for the key elements of both the Block 1 and Block 1B SLS configurations. Wolfe led the manufacturing efforts on the composite payload adapter that will be housed inside the universal stage adapter as part of the Block 1B configuration, beginning with Artemis IV. The engineering development unit is currently undergoing structural testing in the West Test Area. “It’s an incredible feeling knowing that you are part of an effort that helps to inspire so many people,” Wolfe said. “My work has helped move the Artemis campaign forward in many different, directly helping to build and lay the foundation for the materials, processes, and manufacturing efforts that are assisting the advancement of humankind in space exploration.” (NASA/Sam Lott)

NASA’s Josh Whitehead has a passion for systems engineering. He now helps lead the team developing the rocket that will fly the first crew to deep space since the Saturn V. The campaign name of Artemis, the Greek goddess of the Moon, also has special meaning for Whitehead. “I have a twin sister, and Artemis is the twin sister of Apollo. I'm like, hey, I'm a twin! How cool is that?”

Launching a rocket to the Moon takes perseverance and diligence. Josh Whitehead – a world-class engineer, race-winning long-distance runner, and father – knows that it also takes a good attitude. “Positive energies are vital, particularly when working through challenges,” Whitehead said. “Challenges are opportunities to learn and grow. There’s always more than one way; always more than one solution.” Whitehead’s job as the associate manager for the SLS Stages Office supports design, development, certification, and operation of the 212-foot-tall SLS core stage. The massive core stage with two propellant tanks that collectively hold more than 733,000 gallons of super-cold propellant is one of the largest cryogenic propulsion rocket stages. Whitehead and his team are currently preparing to deliver the core stage that will power Artemis II and send a crew of four around the Moon to NASA’s Kennedy Space Center. (NASA/Sam Lott)

Mat Bevill, the associate chief engineer for NASA’s SLS (Space Launch System) Program, plays a crucial role in the development and flight of the SLS mega rocket. His NASA journey started as an intern, led him to have hands-on experience with solid rocket boosters, and landed him in the position of supporting the SLS Chief Engineer’s Office.

Mat Bevill, the associate chief engineer for NASA’s SLS Program, stands in front of a four-segment solid rocket booster that powered the space shuttle at Marshall. As the associate chief engineer for the SLS Program, Bevill assists the program chief engineer by interfacing with each of the element chief engineers and helping make critical decisions for the development and flight of the SLS mega rocket that will power NASA’s Artemis campaign. With the launch of Artemis II, the first crewed test flight of SLS and the Orion spacecraft, Bevill’s technical leadership and support for the SLS Chief Engineer’s Office will place him, once again, at a notable moment in time. “Think of me as the assistant coach,” Bevill said. “While the head coach is on the front line leading the team, I’m on the sidelines providing feedback and advising those efforts.” As a jack-of-all-trades, he enables progress in any way that he can, something he’s familiar with after 37 years with NASA. (NASA/Brandon Hancock)

Brent Gaddes.

Brent Gaddes got his start at Marshall supporting the Space Shuttle Program as it made history in low Earth orbit. Now, his work is taking human deep space exploration to the Moon and beyond with NASA’s SLS rocket. As the lead for the Orion stage adapter and payload adapter in the SLS Spacecraft/Payload Integration & Evolution Office, Gaddes is responsible for managing the teams that design, test, and build the Orion stage adapter for the first three Artemis flights, as well as the payload adapter for the future SLS Block 1B configuration. It means having his eye on a lot of moving parts: the Artemis II Orion stage adapter is awaiting shipment to NASA Kennedy later this year, while the major structure for the Artemis III Orion stage adapter is complete with installations of its avionics unit and diaphragm to come as Marshall test teams continue testing and analysis on an engineering development unit of the Artemis IV payload adapter. Gaddes was born in Decatur, Alabama, but grew up a few hours away in Brentwood, Tennessee. His love of space has stayed with him most of his life: “Seeing the Apollo missions on TV as a child led to a fascination with one of humankind’s most remarkable achievements,” Gaddes said. “To work for NASA has fulfilled a dream of mine, and now to be involved with sending humans back to the Moon is truly an incredible privilege and blessing!” (NASA/Sam Lott)

Gwen Artis.

Gwen Artis started her career at NASA as one of the first high school summer interns at Marshall. Although she briefly relocated to Houston to work with retired astronaut Mae Jemison – the first woman of color to go to space – the majority of Artis’ 40-year career has centered at Marshall, where she has worked on a variety of programs including Spacelab, the Chandra X-Ray Observatory, in-space propulsion, SERVIR, and SLS. As systems engineer professional expert for Jacobs with the Jacobs Space Exploration Group ESSCA contract, Artis assists with the management and oversite of the production for each of the launch vehicle stage adapters for the first three SLS flights for Artemis I, II, and III. The cone-shaped adapter partially encloses the rocket’s interim cryogenic propulsion stage and serves as a key connector to the core stage below it and the upper stage above it. “Marshall has made and led countless contributions in technology advancement and human space exploration and to be a small part of that legacy, and particularly a part of the Artemis Generation, is inconceivable,” Artis said. “I constantly share with great enthusiasm how blessed I am to endeavor into this next great era of human space exploration in hopes that my experiences, my personal story, will embolden others and encourage future engineers, scientists, astronauts, technologists, and all other contributors of space exploration.” (NASA/Sam Lott)

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Marshall Juneteenth Festival Honors Black History, Accomplishments

Black Employees and Allies at Marshall (BEAM), NASA Marshall Space Flight Center’s Office of Diversity and Equal Opportunity, and Harambee hosted a Juneteenth Festival on June 17. The event was in Activities Building 4316 for Marshall team members.

NASA MSFC Juneteenth 2025 Celebration in the 4316 Activities Building
From left, Marshall’s Tawnya Laughinghouse and Alix Martin, and Joseph Price from Jacobs participate in a panel discussion June 17 during the Juneteenth Festival at NASA’s Marshall Space Flight Center. The festival’s theme was “Their Wildest Dreams.”
NASA/Charles Beason

The theme for Juneteenth 2024 was “Their Wildest Dreams,” in honor of Black history and the present accomplishments of African American employees. The festival featured panelists, vendors, food trucks, and more.

“The Juneteenth Festival has become an event that BEAM looks forward to planning for Marshall team members, and we have enjoyed seeing the growth in attendance over the past four years,” said Amanda Otieno, an equal employment specialist in the Office of Diversity & Equal Opportunity and a BEAM member. “Inclusion and cultural awareness are vital for creating a safe and supporting workforce and it’s great to see the center come together to celebrate the significance of the day, but also to learn about and appreciate different cultures. Together we are building a workforce that not only respects but thrives on diversity.”

NASA MSFC Juneteenth 2025 Celebration in the 4316 Activities Building
Marshall team member Andrea Brown sings with her daughter, Jaya Brown, at the Juneteenth Festival.
NASA/Charles Beason

Juneteenth is the oldest nationally celebrated event marking the end of slavery in the United States. BEAM is an employee resource group at Marshall, and Harambee is an employee resource group for Jacobs. To learn more or join BEAM, Marshall team members can email Otieno.

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Black Space Week 2024: A Conversation with the ‘Passtronaut’ – NFL quarterback Joshua Dobbs

As part of Black Space Week (June 16-22), NASA had a conversation with NFL quarterback Joshua Dobbs, also known as the “Passtronaut.” In addition to his football career, Dobbs holds an aerospace engineering degree, and has a passion for space and STEM education. NASA’s Gary Willis sat down for a conversation about Dobbs’ life on and off the field, and how his interests guide his professional and personal journey. Dobbs also attended the NASA in the Park event June 22 at Huntsville’s Big Spring Park East. The event was hosted by NASA’s Marshall Space Flight Center and Downtown Huntsville Inc. (NASA)

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Take 5 with Andrew Schnell

By Wayne Smith

Andrew Schnell grew up in Murfreesboro, Tennessee, just a two-hour trip from the U.S. Space & Rocket Center in Huntsville.

Being nearby, the museum was an obvious attraction because of Schnell’s interest in space exploration as a child. So, too, was a journey toward a long career with NASA’s Marshall Space Flight Center.

Andrew Schnell is the acting manager of NASA’s Chandra X-ray Observatory at the agency’s Marshall Space Flight Center.
Andrew Schnell is the acting manager of NASA’s Chandra X-ray Observatory at the agency’s Marshall Space Flight Center.
NASA/Charles Beason

“I remember being fascinated with NASA and the Space Shuttle Program from the beginning, and my parents were happy to foster my interest,” said Schnell, the acting manager of NASA’s Chandra X-ray Observatory at Marshall. “We probably visited the Space & Rocket Center once a year, and we toured Kennedy Space Center when I was young. So, when I decided to pursue engineering, NASA was just the obvious place for me.”  

As Chandra’s acting project manager today, Schnell and his team monitor the observatory’s operations, “making sure it continues to meet its obligations to the international community of astronomers and astrophysicists that we serve.”

Launched July 23, 1999, NASA is celebrating 25 years of Chandra helping to unravel the secrets of the universe. The observatory is a telescope specially designed to detect X-ray emission from very hot regions of the universe such as exploded stars, clusters of galaxies, and matter around black holes. Marshall has served as home for the Chandra Program Office since its inception.

NASA’s flagship mission for X-ray astronomy, Chandra continues to make contributions to astronomers and astrophysicists. Schnell said what he impresses him most about the observatory is Chandra’s ability to actively contribute to other science missions.

“Over the past year, more than 50 Chandra observations were coordinated with observatories like the James Webb Space Telescope, Hubble, and Marshall’s own IXPE  (Imaging X-ray Polarimetry Explorer),” Schnell said. “Our team can respond to a request in a few days, giving astronomers the unique opportunity to observe the same phenomena in multiple wavelengths.”

And 15 years into his NASA career, Schnell said the entire Chandra team continues to motivate him.

“Every one of them is a world-class scientist or engineer,” Schnell said. “Many of them have spent their entire careers keeping Chandra thriving for almost 25 years now with no servicing missions. They know the observatory inside and out, down to the wiring. It’s amazing watching them troubleshoot a problem in real time. They motivate me to do the best job I can do. I don’t want to let such an amazing team down.”

Question: What excites you most about the future of human space exploration, or your NASA work, and your team’s role it?

Schnell: The thing that excites me the most about working with Chandra is that not only are we helping scientists rewrite our understanding of the universe today, but the data we collect with Chandra now will answer questions that scientists haven’t even asked yet. Years from now, an astrophysicist, maybe one who hasn’t been born yet, is going to have a theory about how some aspect of the universe works, and they’re going to use the data we’re collecting right now to test their theory.

Schnell smiles during a visit to NASA’s Kennedy Space Center in 1984.
Schnell smiles during a visit to NASA’s Kennedy Space Center in 1984.
Photo courtesy of Andrew Schnell

Chandra is the only X-ray observatory of its caliber flying today, and its replacement isn’t even on the drawing board. It’s really important that we continue to keep it operating, pulling in every bit of data we can for tomorrow’s astrophysicists.

Question: What has been the proudest moment of your career and why?

Schnell: A few years ago, I coached a team of summer interns as they built a CubeSat-scale pulsed plasma thruster and tested it in a vacuum chamber. They won one of the research awards at the expo that summer, with a big check and everything. It was one of the coolest things I’ve ever been a part of.

Question: Who or what inspired you to pursue an education/career that led you to NASA and Marshall?

Schnell: I was a summer intern at Marshall in 2001 and 2002, working with Mike Tinker, who was a structural engineer here in the Engineering Directorate. Mike would mentor several interns every summer, pushing us to write conference papers based on our projects. I will never forget his kindness and his willingness to work with interns every summer, all while managing his other tasks. He inspired me, not only to pursue a career at NASA, but to seek out opportunities to serve as a mentor for interns, co-ops, and younger engineers.

Question: What advice do you have for employees early in their NASA career or those in new leadership roles?

Schnell: I’ve seen how easy it is for younger engineers to lose some confidence when they start working here. They’ll measure themselves against their coworkers and think they’ll never be that good, that they’re imposters, that it’s a fluke that they’re working here. I would tell them that no one becomes a NASA employee or a NASA contractor by accident. You are meant to be here. Be kind to yourself, bring your full self to work every day, and you’ll be an expert in your discipline before you realize it.

Question: What do you enjoy doing with your time while away from work?

Schnell: I enjoy drawing and making comics. And as a native of Cincinnati, Ohio, I try to watch as many Cincinnati Reds games as I can during baseball season.

Smith, a Media Fusion employee and the Marshall Star editor, supports the Marshall Office of Communications.

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Chandra Peers into Densest, Weirdest Stars

The supernova remnant 3C 58 contains a spinning neutron star, known as PSR J0205+6449, at its center. Astronomers studied this neutron star and others like it to probe the nature of matter inside these very dense objects. A new study, made using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton, reveals that the interiors of neutron stars may contain a type of ultra-dense matter not found anywhere else in the Universe.

This is an image of the leftovers from an exploded star called 3C 58, shown in X-ray and optical light. At the center of the remnant is a rapidly spinning neutron star, called a pulsar, that presents itself as a bright white object that's somewhat elongated in shape.
In this image of 3C 58, low-energy X-rays are colored red, medium-energy X-rays are green, and the high-energy band of X-rays is shown in blue. The X-ray data have been combined with an optical image in yellow from the Digitized Sky Survey. The Chandra data show that the rapidly rotating neutron star (also known as a “pulsar”) at the center is surrounded by a torus of X-ray emission and a jet that extends for several light-years.
X-ray: NASA/CXC/ICE-CSIC/A. Marino et al.; Optical: SDSS; Image Processing: NASA/CXC/SAO/J. Major

In this image of 3C 58, low-energy X-rays are colored red, medium-energy X-rays are green, and the high-energy band of X-rays is shown in blue. The X-ray data have been combined with an optical image in yellow from the Digitized Sky Survey. The Chandra data show that the rapidly rotating neutron star (also known as a “pulsar”) at the center is surrounded by a torus of X-ray emission and a jet that extends for several light-years. The optical data shows stars in the field.

The team in this new study analyzed previously released data from neutron stars to determine the so-called equation of state. This refers to the basic properties of the neutron stars including the pressures and temperatures in different parts of their interiors.

The authors used machine learning, a type of artificial intelligence, to compare the data to different equations of state. Their results imply that a significant fraction of the equations of state – the ones that do not include the capability for rapid cooling at higher masses – can be ruled out.

The researchers capitalized on some neutron stars in the study being located in supernova remnants, including 3C 58. Since astronomers have age estimates of the supernova remnants, they also have the ages of the neutron stars that were created during the explosions that created both the remnants and the neutron stars. The astronomers found that the neutron star in 3C 58 and two others were much cooler than the rest of the neutron stars in the study.

The team thinks that part of the explanation for the rapid cooling is that these neutron stars are more massive than most of the rest. Because more massive neutron stars have more particles, special processes that cause neutron stars to cool more rapidly might be triggered.

One possibility for what is inside these neutron stars is a type of radioactive decay near their centers where neutrinos – low mass particles that easily travel through matter – carry away much of the energy and heat, causing rapid cooling.

Another possibility is that there are types of exotic matter found in the centers of these more rapidly cooling neutron stars.

The Nature Astronomy paper describing these results is available here. The authors of the paper are Alessio Marino (Institute of Space Sciences (ICE) in Barcelona, Spain), Clara Dehman (ICE), Konstantinos Kovlakas (ICE), Nanda Rea (ICE), J. A. Pons (University of Alicante in Spain), and Daniele Viganò (ICE).

NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science from Cambridge Massachusetts and flight operations from Burlington, Massachusetts.

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Growing Interest: Marshall Hosts Pollinator Week Event

NASA MSFC Pollinator week event in Butterfly Garden at the 4315 walking trail.

Team members at NASA’s Marshall Space Flight Center learn about the center’s pollinator garden from Joni Melson, left, and Kristen Wagner during a Pollinator Week event June 17. The Pollinator Club at Marshall hosted the event, showing the benefits of cultivating a healthy biosphere of flowering plants and other greenery to support local populations of bees, butterflies, and other pollinating insects. Attendees also received free native plants and seeds. The event was part of Pollinator Week, the annual nationwide environmental activity held this year from June 17-23. The center’s pollinator garden is situated between Building 4315 and the Redstone Arsenal walking trail. The garden is a volunteer-maintained collection of more than 160 plants, mostly drought-tolerant perennials which will draw pollinating insects. The habitat, a registered Monarch Waystation, is certified with the North American Butterfly Association.​​​​​​​ Marshall team members can learn more about the Pollinator Club on Inside Marshall. (NASA/Charles Beason)

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NASA, Partners Conduct Fifth Asteroid Impact Exercise, Release Summary

For the benefit of all, NASA released a summary June 20 of the fifth biennial Planetary Defense Interagency Tabletop Exercise. NASA’s Planetary Defense Coordination Office, in partnership with FEMA (Federal Emergency Management Agency) and with the assistance of the U.S. Department of State Office of Space Affairs, convened the tabletop exercise to inform and assess our ability as a nation to respond effectively to the threat of a potentially hazardous asteroid or comet.

planetary-defense-meeting.jpg?w=1634
Representatives from NASA, FEMA, and the planetary defense community participate in the 5th Planetary Defense Interagency Tabletop Exercise to inform and assess our ability as a nation to respond effectively to the threat of a potentially hazardous asteroid or comet.
NASA/JHU-APL/Ed Whitman

Although there are no known significant asteroid impact threats for the foreseeable future, hypothetical exercises provide valuable insights by exploring the risks, response options, and opportunities for collaboration posed by varying scenarios, from minor regional damage with little warning to potential global catastrophes predicted years or even decades in the future.

“The uncertainties in these initial conditions for the exercise allowed participants to consider a particularly challenging set of circumstances,” said Lindley Johnson, planetary defense officer emeritus NASA Headquarters. “A large asteroid impact is potentially the only natural disaster humanity has the technology to predict years in advance and take action to prevent.”

During the exercise, participants considered potential national and global responses to a hypothetical scenario in which a never-before-detected asteroid was identified that had, according to initial calculations, a 72% chance of hitting Earth in approximately 14 years. The preliminary observations described in the exercise, however, were not sufficient to precisely determine the asteroid’s size, composition, and long-term trajectory. To complicate this year’s hypothetical scenario, essential follow-up observations would have to be delayed for at least seven months – a critical loss of time – as the asteroid passed behind the Sun as seen from Earth’s vantage point in space.

Conducting exercises enable government stakeholders to identify and resolve potential issues as part of preparation for any real-world situation. It was held in April at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, and brought together nearly 100 representatives from across U.S. government agencies and, for the first time, international collaborators on planetary defense.

“Our mission is helping people before, during, and after disasters,” said Leviticus “L.A.” Lewis, FEMA detailee to NASA’s Planetary Defense Coordination Office. “We work across the country every day before disasters happen to help people and communities understand and prepare for possible risks. In the event of a potential asteroid impact, FEMA would be a leading player in interagency coordination.” 

This exercise was the first to use data from NASA’s DART (Double Asteroid Redirection Test) mission, the first in-space demonstration of a technology for defending Earth against potential asteroid impacts. The DART spacecraft, which impacted the asteroid moonlet Dimorphos on Sept. 26, 2022, confirmed a kinetic impactor could change the trajectory of an asteroid. Applying this or any type of technology to an actual impact threat would require many years of advance planning.

To help ensure humanity will have the time needed to evaluate and respond to a potentially hazardous asteroid or comet, NASA continues the development of its NEO Surveyor (Near-Earth Object Surveyor), an infrared space telescope designed specifically to expedite our ability to discover and characterize most of the potentially hazardous near-Earth objects many years before they could become an impact threat. The agency’s NEO Surveyor’s proposed launch date is set for June 2028.

NASA will publish a complete after-action report for the tabletop exercise later, which will include strengths and gaps identified from analysis of the response, other discussions during the exercise, and recommendations for improvement.

“These outcomes will help to shape future exercises and studies to ensure NASA and other government agencies continue improving planetary defense preparedness,” said Johnson.

NASA established the Planetary Defense Coordination Office in 2016 to manage the agency’s ongoing planetary-defense efforts. Johns Hopkins APL managed the DART mission for NASA as a project of the agency’s Planetary Missions Program Office, which is at NASA’s Marshall Space Flight Center.

Learn more about planetary defense at NASA.

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      Quantifying the changing structure and extent of benthic coral communities is essential for informing restoration efforts and identifying stressed regions of coral. Accurate classification of shallow-water benthic coral communities requires high spectral and spatial resolution, currently not available on spaceborne sensors, to observe the seafloor through an optically complex seawater column. Here we create a shallow water benthic cover type map of Kaneohe Bay, Oahu, Hawaii using the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) without requiring in-situ data as inputs. We first run the AVIRIS data through a semi-analytical inversion model to derive color dissolved organic matter, chlorophyll concentration, bottom albedo, suspended sediment, and depth parameters for each pixel, which are then matched to a Hydrolight simulated water column. Pure reflectance for coral, algae, and sand are then projected through each water column to create spectral endmembers for each pixel. Multiple Endmember Spectral Mixture Analysis (MESMA) provides fractional cover of each benthic class on a per-pixel basis. We demonstrate the efficacy of using simulated water columns to create surface reflectance spectral endmembers as Hydrolight-derived in-situ endmember spectra strongly match AVIRIS surface reflectance for corresponding locations (average R = 0.96). This study highlights the capabilities of using medium-fine resolution hyperspectral imagery to identify fractional cover type of localized coral communities and lays the groundwork for future spaceborne hyperspectral monitoring of global coral communities.

      Atticus Cummings
      Quantifying Uncertainty In Kelp Canopy Remote Sensing Using the Harmonized Landsat Sentinel-2 Dataset
      Atticus Cummings
      California’s giant kelp forests serve as a major foundation for the region’s rich marine biodiversity and provide recreational and economic value to the State of California. With the rising frequency of marine heatwaves and extreme weather onset by climate change, it has become increasingly important to study these vital ecosystems. Kelp forests are highly dynamic, changing across several timescales; seasonally due to nutrient concentrations, waves, and predator populations, weekly with typical growth and decay, and hourly with the tides and currents. Previous remote sensing of kelp canopies has relied on Landsat imagery taken with a eight-day interval, limiting the ability to quantify more rapid changes. This project aims to address uncertainty in kelp canopy detection using the Harmonized Landsat and Sentinel-2 (HLS) dataset’s zero to five-day revisit period. A random forest classifier was used to identify pixels that contain kelp, on which Multiple Endmember Spectral Mixture Analysis (MESMA) was then run to quantify intrapixel kelp density. Processed multispectral satellite images taken within 3 days of one another were paired for comparison. The relationship between fluctuations in kelp canopy density with tides and currents was assessed using in situ data from an acoustic doppler current profiler (ADCP) at the Santa Barbara Long Term Ecological Research site (LTER) and a NOAA tidal buoy. Preliminary results show that current and tidal trends cannot be accurately correlated with canopy detection due to other sources of error. We found that under cloud-free conditions, canopy detection between paired images varied on average by 42%. Standardized image processing suggests that this uncertainty is not created within the image processing step, but likely arises due to exterior factors such as sensor signal noise, atmospheric conditions, and sea state. Ultimately, these errors could lead to misinterpretation of remotely sensed kelp ecosystems, highlighting the need for further research to identify and account for uncertainties in remote sensing of kelp canopies.

      Jasmine Sirvent
      Kelp Us!: A Methods Analysis for Predicting Kelp Pigment Concentrations from Hyperspectral Reflectance
      Jasmine Sirvent
      Ocean color remote sensing enables researchers to assess the quantity and physiology of life in the ocean, which is imperative to understanding ecosystem health and formulating accurate predictions. However, without proper methods to analyze hyperspectral data, correlations between spectral reflectance and physiological traits cannot be accurately derived. In this study, I explored different methods—single variable regression, partial least squares regressions (PLSR), and derivatives—in analyzing in situ Macrocystis pyrifera (giant kelp) off the coast of Santa Barbara, California in order to predict pigment concentrations from AVIRIS hyperspectral reflectance. With derivatives as a spectral diagnostic tool, there is evidence suggesting high versus low pigment concentrations could be diagnosed; however, the fluctuations were within 10 nm of resolution, thus AVIRIS would be unable to reliably detect them. Exploring a different method, I plotted in situ pigment measurements — chlorophyll a, fucoxanthin, and the ratio of fucoxanthin to chlorophyll a—against hyperspectral reflectance that was resampled to AVIRIS bands. PLSR proved to be a more successful model because of its hyperdimensional analysis capabilities in accounting for multiple wavelength bands, reaching R2 values of 0.67. Using this information, I constructed a model that predicts kelp pigments from simulated AVIRIS reflectance using a spatial time series of laboratory spectral measurements and photosynthetic pigment concentrations. These results have implications, not only for kelp, but many other photosynthetic organisms detectable by hyperspectral airborne or satellite sensors. With these findings, airborne optical data could possibly predict a plethora of other biogeochemical traits. Potentially, this research would permit scientists to acquire data analogous to in situ measurements about floating matters that cannot financially and pragmatically be accessed by anything other than a remote sensor.

      Isabelle Cobb
      Correlations Between SSHa and Chl-a Concentrations in the Northern South China Sea
      Isabelle Cobb
      Sea surface height anomalies (SSHa)–variations in sea surface height from climatological averages–occur on seasonal timescales due to coastal upwelling and El Niño-Southern Oscillation (ENSO) cycles. These anomalies are heightened when upwelling plumes bring cold, nutrient-rich water to the surface, and are particularly strong along continental shelves in the Northern South China Sea (NSCS). This linkage between SSHa and nutrient availability has interesting implications for changing chlorophyll-a (chl-a) concentrations, a prominent indicator of phytoplankton biomass that is essential to the health of marine ecosystems. Here, we evaluate the long-term (15 years) relationship between SSHa and chl-a, in both satellite remote sensing data and in situ measurements. Level 3 SSHa data from Jason 1/2/3 satellites and chl-a data from MODIS Aqua were acquired and binned to monthly resolution. We found a significant inverse correlation between SSHa and chl-a during upwelling months in both the remote sensing (Spearman’s R=-0.57) and in situ data, with higher resolution in situ data from ORAS4 (an assimilation of buoy observations from 2003-2017) showing stronger correlations (Spearman’s R=-0.75). In addition, the data reveal that the magnitude of SSH increases with time during instances of high correlation, possibly indicating a trend of increased SSH associated with reduced seasonal chl-a concentrations. Thus, this relationship may inform future work predicting nutrient availability and threats to marine ecosystems as climate change continues to affect coastal sea surface heights.

      Alyssa Tou
      Exploring Coastal Sea Surface Temperature Anomalies and their effect on Coastal Fog through analyzing Plant Phenology
      Alyssa Tou
      Marine heat waves (MHW) have been increasing in frequency, duration and intensity, giving them substantial potential to influence ecosystems. Do these MHWs sufficiently enhance coastal precipitation such that plant growth is impacted? Recently, the Northeast Pacific experienced a long, intense MHW in 2014/2015, and another short, less intense MHW in 2019/2020. Here we investigate how the intensity and duration of MHWs influence the intensity and seasonal cycle of three different land cover types (‘grass’, ‘trees’, and a combination of both ‘combined’’) to analyze plant phenology trends in Big Sur, California. We hypothesize that longer intense MHWs decrease the ocean’s evaporative capacity, decreasing fog, thus lowering plant productivity, as measured by Normalized Difference Vegetation Index (NDVI). Sea surface temperature (SST) and NDVI data were collected from the NOAA Coral Reef Watch, and NASA MODIS/Terra Vegetation Indices 16-Day L3 Global 250m products respectively. Preliminary results show no correlation (R2=0.02) between SSTa and combined NDVI values and no correlation (R2=0.01) between SST and NDVI. This suggests that years with anomalously high SST do not significantly impact plant phenology. During the intense and long 2014/2015 MHW, peak NDVI values for ‘grass’ and ‘combined’ pixels were 2.0 and 1.7 standard deviations above the climatological average, while the shorter 2019/2020 MHW saw higher peaks of 3.2 and 2.4 standard deviations. However, the ‘grass’, ‘tree’ and ‘combined’ NDVI anomalies were statistically insignificant during both MHWs, showing that although NDVI appeared to increase during the shorter and less intense MHW, these values may be attributed to other factors. The data qualitatively suggest that MHW’s don’t impact the peak NDVI date, but more data at higher temporal resolution are necessary. Further research will involve analyzing fog indices and exploring confounding variables impacting NDVI, such as plant physiology, anthropogenic disturbance, and wildfires. In addition, it’s important to understand to what extent changes in NDVI are attributed to the driving factors of MHWs or the MHWs themselves. Ultimately, mechanistically understanding the impacts MHW intensity and duration have on terrestrial ecosystems will better inform coastal community resilience.


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      Last Updated Nov 22, 2024 Related Terms
      General Explore More
      10 min read SARP East 2024 Atmospheric Science Group
      Article 21 mins ago 10 min read SARP East 2024 Hydroecology Group
      Article 21 mins ago 11 min read SARP East 2024 Terrestrial Fluxes Group
      Article 22 mins ago View the full article
    • By NASA
      10 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Return to 2024 SARP Closeout Faculty Advisors:
      Dr. Guanyu Huang, Stony Brook University
      Graduate Mentor:
      Ryan Schmedding, McGill University

      Ryan Schmedding, Graduate Mentor
      Ryan Schmedding, graduate mentor for the 2024 SARP Atmospheric Science group, provides an introduction for each of the group members and shares behind-the scenes moments from the internship.
      Danielle Jones
      Remote sensing of poor air quality in mountains: A case study in Kathmandu, Nepal
      Danielle Jones
      Urban activity produces particulate matter in the atmosphere known as aerosol particles. These aerosols can negatively affect human health and cause changes to the climate system. Measures for aerosols include surface level PM2.5 concentration and aerosol optical depth (AOD). Kathmandu, Nepal is an urban area that rests in a valley on the edge of the Himalayas and is home to over three million people. Despite the prevailing easterly winds, local aerosols are mostly concentrated in the valley from the residential burning of coal followed by industry. Exposure to PM2.5 has caused an estimated ≥8.6% of deaths annually in Nepal. We paired NASA satellite AOD and elevation data, model  meteorological data, and local AirNow PM2.5 and air quality index (AQI) data to determine causes of variation in pollutant measurement during 2023, with increased emphasis on the post-monsoon season (Oct. 1 – Dec. 31). We see the seasonality of meteorological data related to PM2.5 and AQI. During periods of low temperature, low wind speed, and high pressure, PM2.5 and AQI data slightly diverge. This may indicate that temperature inversions increase surface level concentrations of aerosols but have little effect on the total air column. The individual measurements of surface pressure, surface temperature, and wind speed had no observable correlation to AOD (which was less variable than PM2.5 and AQI over the entire year). Elevation was found to have no observable effect on AOD during the period of study. Future research should focus on the relative contributions of different pollutants to the AQI to test if little atmospheric mixing causes the formation of low-altitude secondary pollutants in addition to PM2.5 leading to the observed divergence in AQI and PM2.5.

      Madison Holland
      Analyzing the Transport and Impact of June 2023 Canadian Wildfire Smoke on Surface PM2.5 Levels in Allentown, Pennsylvania
      Madison Holland
      The 2023 wildfire season in Canada was unparalleled in its severity. Over 17 million hectares burned, the largest area ever burned in a single season. The smoke from these wildfires spread thousands of kilometers, causing a large population to be exposed to air pollution. Wildfires can release a variety of air pollutants, including fine particulate matter (PM2.5). PM2.5 directly affects human health – exposure to wildfire-related PM2.5 has been associated with respiratory issues such as the exacerbation of asthma and chronic obstructive pulmonary disease. In June 2023, smoke from the Canadian wildfires drifted southward into the United States. The northeastern United States reported unhealthy levels of air quality due to the transportation of the smoke. In particular, Pennsylvania reported that Canadian wildfires caused portions of the state to have “Hazardous” air quality. Our research focused on how Allentown, PA experienced hazardous levels of air quality from this event. To analyze the concentrations of PM2.5 at the surface level, NASA’s Hazardous Air Quality Ensemble System (HAQES) and the EPA’s Air Quality System (AQS) ground-based site data were utilized. By comparing HAQES’s forecast of hazardous air quality events with recorded daily average PM2.5 with the EPA’s AQS, we were able to compare how well the ensemble system was at predicting total PM2.5 during unhealthy air quality days. NOAA’s Hybrid Single-Particle Lagrangian Integrated Trajectory model, pyrsig, and the Canadian National Fire Database were used. These datasets revealed the trajectory of aerosols from the wildfires to Allentown, Pennsylvania, identified the densest regions of the smoke plumes, and provided a map of wildfire locations in southeastern Canada. By integrating these datasets, we traced how wildfire smoke transported aerosols from the source at the ground level.

      Michele Iraci
      Trends and Transport of Tropospheric Ozone From New York City to Connecticut in the Summer of 2023
      Michele Iraci
      Tropospheric Ozone, or O₃, is a criteria pollutant contributing to most of Connecticut and New York City’s poor air quality days. It has adverse effects on human health, particularly for high-risk individuals. Ozone is produced by nitrogen oxides and volatile organic compounds from fuel combustion reacting with sunlight. The Ozone Transport Region (OTR) is a collection of states in the Northeast and Mid-Atlantic United States that experience cross-state pollution of O₃. Connecticut has multiple days a year where O₃ values exceed the National Ambient Air Quality Standards requiring the implementation of additional monitoring and standards because it falls in the OTR. Partially due to upstream transport from New York City, Connecticut experiences increases in O₃ concentrations in the summer months. Connecticut has seen declines in poor air quality days from O₃ every year due to the regulations on ozone and its precursors. We use ground-based Lidar, Air Quality System data, and a back-trajectory model to examine a case of ozone enhancement in Connecticut caused by air pollutants from New York between June and August 2023. In this time period, Connecticut’s ozone enhancement was caused by air pollutants from New York City. As a result, New York City and Connecticut saw similar O₃ spikes and decline trends. High-temperature days increase O₃ in both places, and wind out of the southwest may transport O₃ to Connecticut. Production and transport of O₃ from New York City help contribute to Connecticut’s poor air quality days, resulting in the need for interstate agreements on pollution management.

      Stefan Sundin
      Correlations Between the Planetary Boundary Layer Height and the Lifting Condensation Level
      Stefan Sundin
      The Planetary Boundary Layer (PBL) characterizes the lowest layer in the atmosphere that is coupled with diurnal heating at the surface. The PBL grows during the day as solar heating causes pockets of air near the surface to rise and mix with cooler air above. Depending on the type of terrain and surface albedo that receives solar heating, the depth of the PBL can vary to a great extent. This makes PBL height (PBLH) a difficult variable to quantify spatially and temporally. While several methods have been used to obtain the PBLH such as wind profilers and lidar techniques, there is still a level of uncertainty associated with PBLH. One method of predicting seasonal PBLH fluctuation and potentially lessening uncertainty that will be discussed in this study is recognizing a correlation in PBLH with the lifting condensation level (LCL). Like the PBL, the LCL is used as a convective parameter when analyzing upper air data, and classifies the height in the atmosphere at which a parcel becomes saturated when lifted by a forcing mechanism, such as a frontal boundary, localized convergence, or orographic lifting. A reason to believe that PBLH and LCL are interconnected is their dependency on both the amount of surface heating and moisture that is present in the environment. These thermodynamic properties are of interest in heavily populated metropolitan areas within the Great Plains, as they are more susceptible to severe weather outbreaks and associated economic losses. Correlations between PBLH and LCL over the Minneapolis-St. Paul metropolitan statistical area during the summer months of 2019-2023 will be discussed.

      Angelica Kusen
      Coupling of Chlorophyll-a Concentrations and Aerosol Optical Depth in the Subantarctic Southern Ocean and South China Sea (2019-2021)
      Angelica Kusen
      Air-sea interactions form a complex feedback mechanism, whereby aerosols impact physical and biogeochemical processes in marine environments, which, in turn, alter aerosol properties. One key indicator of these interactions is chlorophyll-a (Chl-a), a pigment common to all phytoplankton and a widely used proxy for primary productivity in marine ecosystems. Phytoplankton require soluble nutrients and trace metals for growth, which typically come from oceanic processes such as upwelling. These nutrients can also be supplied via wet and dry deposition, where atmospheric aerosols are removed from the atmosphere and deposited into the ocean. To explore this interaction, we analyze the spatial and temporal variations of satellite-derived chl-a and AOD, their correlations, and their relationship with wind patterns in the Subantarctic Southern Ocean and the South China Sea from 2019 to 2021, two regions with contrasting environmental conditions.
      In the Subantarctic Southern Ocean, a positive correlation (r²= 0.26) between AOD and Chl-a was found, likely due to dust storms following Austrian wildfires. Winds deposit dust aerosols rich in nutrients, such as iron, to the iron-limited ocean, enhancing phytoplankton photosynthesis and increasing chl-a. In contrast, the South China Sea showed no notable correlation (r² = -0.02) between AOD and chl-a. Decreased emissions due to COVID-19 and stricter pollution controls likely reduced the total AOD load and shifted the composition of aerosols from anthropogenic to more natural sources.
      These findings highlight the complex interrelationship between oceanic biological activity and the chemical composition of the atmosphere, emphasizing that atmospheric delivery of essential nutrients, such as iron and phosphorus, promotes phytoplankton growth. Finally, NASA’s recently launched PACE mission will contribute observations of phytoplankton community composition at unprecedented scale, possibly enabling attribution of AOD levels to particular groups of phytoplankton.

      Chris Hautman
      Estimating CO₂ Emission from Rocket Plumes Using in Situ Data from Low Earth Atmosphere
      Chris Hautman
      Rocket emissions in the lower atmosphere are becoming an increasing environmental concern as space exploration and commercial satellite launches have increased exponentially in recent years. Rocket plumes are one of the few known sources of anthropogenic emissions directly into the upper atmosphere. Emissions in the lower atmosphere may also be of interest due to their impacts on human health and the environment, in particular, ground level pollutants transported over wildlife protected zones, such as the Everglades, or population centers near launch sites. While rockets are a known source of atmospheric pollution, the study of rocket exhaust is an ongoing task. Rocket exhaust can have a variety of compositions depending on the type of engine, the propellants used, including fuels, oxidizers, and monopropellants, the stoichiometry of the combustion itself also plays a role. In addition, there has been increasing research into compounds being vaporized in atmospheric reentry. These emissions, while relatively minimal compared to other methods of travel, pose an increasing threat to atmospheric stability and environmental health with the increase in human space activity. This study attempts to create a method for estimating the total amount of carbon dioxide released by the first stage of a rocket launch relative to the mass flow of RP-1, a highly refined kerosene (C₁₂H₂₆)), and liquid oxygen (LOX) propellants. Particularly, this study will focus on relating in situ CO₂ emission data from a Delta II rocket launch from Vandenberg Air Force Base on April 15, 1999, to CO₂ emissions from popular modern rockets, such as the Falcon 9 (SpaceX) and Soyuz variants (Russia). The findings indicate that the CO₂ density of any RP-1/LOX rocket is 6.9E-7 times the mass flow of the sum of all engines on the first stage. The total mass of CO₂ emitted can be further estimated by modeling the volume of the plume as cylindrical. Therefore, the total mass can be calculated as a function of mass flow and first stage main engine cutoff. Future CO₂ emissions on an annual basis are calculated based on these estimations and anticipated increases in launch frequency.


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      Last Updated Nov 22, 2024 Related Terms
      General Explore More
      8 min read SARP East 2024 Ocean Remote Sensing Group
      Article 21 mins ago 10 min read SARP East 2024 Hydroecology Group
      Article 21 mins ago 11 min read SARP East 2024 Terrestrial Fluxes Group
      Article 22 mins ago View the full article
    • By NASA
      10 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Return to 2024 SARP Closeout Faculty Advisors:
      Dr. Dom Ciruzzi, College of William & Mary
      Graduate Mentor:
      Marley Majetic, Pennsylvania State University

      Marley Majetic, Graduate Mentor
      Marley Majetic, graduate mentor for the 2024 SARP Hydroecology group, provides an introduction for each of the group members and shares behind-the scenes moments from the internship.
      Jordan DiPrima
      How are different land cover types affected by land subsidence on the U.S. Atlantic Coast?
      Jordan DiPrima
      Land subsidence is a frequently overlooked geologic hazard that is caused by natural processes and, more recently, anthropogenic stressors. The goal of this study is to observe subsidence trends and hotspots among land cover types on Virginia’s Eastern Shore and Long Island, New York. This study utilizes interferometric synthetic aperture radar, or InSAR, satellite data from Sentinel-1 to map vertical land motion from 2017 to 2023. Land cover data were sourced from Landsat 8 satellite imagery. Subsidence was mapped within the following land cover types on the Eastern Shore: urban, wetland, cropland, temperate or sub-polar grassland, temperate or sub-polar shrubland, mixed forest, and temperate or subpolar needleleaf forest. These land cover types have mean vertical velocities ranging from -0.2 mm/yr to -5.2 mm/yr. Results suggest that land subsidence is most severe in cropland areas on the Eastern Shore, with a mean vertical velocity of -5.2 mm/yr. In contrast, wetlands display the most subsidence on Long Island with a mean vertical velocity of -2.1 mm/yr. Long Island lacked distinct trends among land cover types and instead showed evidence of subsidence hotspots. These hotspots exist in the following land cover types: temperate or sub-polar grassland, barren lands, wetland, cropland, and temperate or sub-polar broadleaf deciduous forest. Overall, Eastern Shore croplands and Long Island wetlands were determined to be the most susceptible land cover types. These findings highlight regions at risk of sea level rise, flooding, and coastal erosion as a result of subsidence. With further research, we can map subsiding landscapes on a global scale to improve resource allocation and mitigation techniques.

      Isabelle Peterson
      Total Thermokarst Lake Changes on the Seward Peninsula, Alaska: 2016 to 2024
      Isabelle Peterson
      Thermokarst landscapes have and will continue to change as the arctic landscape warms due to climate change. Permafrost underlies much of these arctic landscapes, and as it melts, thermokarst landscapes are left behind. The Seward Peninsula in Alaska has an abundance of these landscapes, and thermokarst lakes are present in the northernmost portion. Several lakes have come and gone, but with increasing climate instability and warming of the area, there is a possibility of more permafrost melting, creating more of these lakes. To capture these changes, Harmonized Landsat Sentinel-2 (HLS) imagery were used to create annual lake maps of the northern portion of the Seward Peninsula from 2016 to 2024. Much of the methodology was informed from Jones et al. (2011); however, their study used eCognition, while the present study used ArcGIS Pro. This caused some differences in results likely due to the differences in software, satellite imagery, and the proposed study area. Lake number changes were observed annually. From this annual change, several 10 to 40 ha lakes disappeared and reappeared within the study period, along with smaller lakes filling in where larger lakes once were. Thermokarst lake drainage is a process described by Jones and Arp (2015) which has devastating geomorphological impacts on the surrounding area, creating large drainage troughs which diminish surrounding permafrost in a quick time frame. To capture these events and overall changes, satellite imagery is essential. This is especially true in remote regions which are hard to reach by foot and require flight missions to be scheduled over the area for aerial photography. However, LVIS and other higher resolution aerial instruments would provide higher accuracy when identifying smaller lakes, as satellite imagery does not accurately capture lakes below 1 ha in the study area. This assertion is made due to conflicting results compared to Jones et al (2011). While the methodologies of this study have been executed manually, Qin, Zhang, and Lu (2023) have proposed the idea of using Sentinel-2 imagery to map thermokarst lakes through automatic methods. While automatization has not yet been perfected, the potential is there and can be used to analyze thermokarst areas effectively. With more satellite imagery, annual, monthly, and potentially daily changes can be captured in favorable months to monitor changing landscapes in arctic regions. Thermokarst lakes have been changing, and monitoring them can help in the process of understanding the changing climate in arctic areas, especially through the lens melting permafrost.

      Emmanelle Cuasay
      Finding Refuge in Climate Crisis: Analyzing the Differences between Refugia and Non-Refugia in the Northern Philippines Using Remote Sensing
      Emmanelle Cuasay
      Refugia are areas that are characterized by stable environmental conditions that can act as a refuge for species as Earth’s climate warms. In this study, fourteen Harmonized Landsat Sentinel-2 images from February 2014 – March 2024 of the northern Philippines region were used. The region of interest is the terrestrial biome by Lake Taal. Normalized Difference Vegetation Index (NDVI) maps were created from all fourteen images to determine the NDVI 25th highest quartiles of the long-term average NDVI images and of a dry and wet year NDVI image. These values were then used to create refugia and non-refugia maps using ArcGIS Pro. Land cover data from Sentinel-2 and a digital elevation model (DEM), using the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), were plotted in ArcGIS Pro to determine the slope and aspect of the area. Global Ecosystems Dynamics Investigation (GEDI) data were used to look at forest height of the study area, and the distribution of forest height, slope, aspect, and elevation were plotted to determine their probability densities in refugia and non-refugia areas. Results of this study show increased biomass in refugia areas. This suggests that conservation practices are crucial to aid in the preservation of biodiversity and biomass within these refugia areas.

      Jayce Crayne
      Site-Based Observations of a Saharan Dust Storm’s Impacts on Evapotranspiration in North-Central Florida
      Jayce Crayne
      Saharan dust storms serve an important role in the western Atlantic’s climate in their contribution to Earth’s radiation budget, modulating sea surface temperatures (SSTs), fertilizing ecosystems, and suppressing cloud and precipitation patterns (Yuan et al., 2020). However, Saharan dust storms are expected to become less frequent in this region as SSTs continue to rise (Yuan et al., 2020). Predicting the climate response to this change requires a keen understanding of how the presence of these storms affect evapotranspiration (ET) and its indicators. This study utilizes site-based observational data from an AmeriFlux tower near Gainesville, FL recorded during a large dust storm in late June 2020. The storm’s progression was documented using satellite imagery from Aqua and Terra and aerosol optical depth (AOD) measurements from an Aerosol Robotic Network (AERONET) station co-located with the AmeriFlux tower. Indicators of ET such as surface air temperature, vapor pressure deficit, photosynthetic photon flux density, and net radiation were analyzed. Findings were compared to modeled ET and latent energy flux reanalysis data provided by the Global Land Data Assimilation System (GLDAS). Both model simulations and on-site observations support that ET decreased during the days dust concentrations were heaviest and for a short time thereafter. Cloud cover data adopted from meteorological aerodrome reports (METARs) provided by an automated surface observing system (ASOS) located in Gainesville showed that clouds were not a major contributor in decreasing ET during the days of heaviest dust. The results of this study show a considerable decrease in ET as a result of dust aerosols. Further research is necessary to determine whether changes in ET due to Saharan dust storms are significant enough to alter climates in the western Atlantic and, if so, what the climate response will be if the frequency of storms decreases.

      Brandon Wilson
      Predicting 2025 and 2028 dNBR and dNDIV for Csarf Smith River Complex / Evaluating the Effects of 2019 California Wildfire Fund
      Brandon Wilson
      Biodiverse regions across California remain vulnerable to harmful wildfires year round. Quantifying and measuring these regions’ wildfire resilience is necessary for understanding where/how to allocate environmental resources. Several ecological wildfire studies have been conducted utilizing artificial intelligence and remote sensing to analyze and predict biodiversity damage across wildfire prone regions, including Northern Algeria and Arkansas, USA. The current case study aims to analyze biodiversity damage from the 2023 Csarf Smith River Complex Fire in Six Rivers National Forest, California and predict the difference in Normalized Burn Ratio (dNBR) and difference in Normalized Difference Vegetation Index (dNDVI) for 2025 and 2028 using remote-sensing-based random forest (RF) regression. Furthermore, to observe, holistically, a practical method California has implemented to address state-wide wildfire damage, the 2019 California Wildfire Fund (AB 1054 and AB 111) was evaluated using the synthetic control method (SCM). For this case study, remote sensing data from the United States Geological Survey (USGS) and NASA (Landsat 9 Satellite C2 L2, TerraClimate and the Land Data Assimilation System) were utilized for processing relevant spectral indexes for the RF. Data from NOAA, Energy Information Agency, International Monetary Fund and Bureau of Economic Analysis were utilized as synthetic control datasets to evaluate the effects of the 2019 California Wildfire Fund. Elevated topography in this study area is susceptible to high severity burn effects, while less elevated topography burns less. This result affected dNBR and dNDVI predictions as elevated areas seemingly did not have strong resilience to rampant burns. This demonstrates a direct correlation to potential lower transpiration rates for elevated areas, warranting further analysis. Results of low variance, post-treatment, between the treated unit and the synthetic control unit, poses concern for the positive effect of the 2019 Wildfire Fund.

      Carrie Hashimoto
      Describing changes in evapotranspiration following the 2020 Creek Fire in the southern Sierra Nevada
      Carrie Hashimoto
      Climatic warming and high tree density have caused larger and more severe wildfires to occur in western United States forests over time. Wildfires affect both the hydrology and ecology of forests via alterations to the water balance (e.g., evapotranspiration, streamflow, infiltration, and more) and could shift vegetation communities and subsequent ecosystem structure and function. This project explores ecological characteristics of a landscape that predict the extent to which the Creek Fire in the southern Sierra Nevada has affected evapotranspiration. Strides in understanding of consequential evapotranspiration changes can create pathways to address emerging forest health challenges posed by similar western fires. For analysis, various remote sensing and modeled data were collected from OpenET, the North American Land Data Assimilation System, TerraClimate, Harmonized LandSat Sentinel-2 data, and the Shuttle Radar Topography Mission. Multiple linear regression and generalized additive models were constructed. Relative change in evapotranspiration served as the response variable. Model covariates included average temperature, total precipitation in the preceding months, average soil moisture, elevation, slope, aspect, northness, latitude, pre-fire normalized difference vegetation index (NDVI), and post-fire change in normalized burn ratio (dNBR). Best subset selection with cross validation demonstrated minimization of cross-validation error with a 7-covariate model. This reduced model yields lower complexity and more interpretability while sustaining an adjusted R2 of 0.626, compared to the full model’s adjusted R2 of 0.663. A reduced generalized additive model (GAM) with interaction terms drawn from the linear model variable selection demonstrated an adjusted R2 of 0.695, indicating a better fit that comes at the cost of reduced interpretability and higher computational requirements than the linear models. The goal of this work is to disentangle environmental indicators of post-fire evapotranspiration change, such that predictive modeling of future wildfire impacts on evapotranspiration can be achieved.


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      Last Updated Nov 22, 2024 Related Terms
      General Explore More
      8 min read SARP East 2024 Ocean Remote Sensing Group
      Article 21 mins ago 10 min read SARP East 2024 Atmospheric Science Group
      Article 21 mins ago 11 min read SARP East 2024 Terrestrial Fluxes Group
      Article 22 mins ago View the full article
    • By NASA
      11 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Return to 2024 SARP Closeout Faculty Advisors:
      Dr. Lisa Haber, Virginia Commonwealth University
      Dr. Brandon Alveshere, Virginia Commonwealth University
      Dr. Chris Gough, Virginia Commonwealth University
      Graduate Mentor:
      Mindy Priddy, Virginia Commonwealth University

      Mindy Priddy, Graduate Mentor
      Mindy Priddy, graduate mentor for the 2024 SARP Terrestrial Fluxes group, provides an introduction for each of the group members and shares behind-the scenes moments from the internship.

      Angelina De La Torre
      Using NDVI as a Proxy for GPP to Predict Carbon Dioxide Fluxes
      Angelina De La Torre
      Climate change, driven primarily by greenhouse gases, poses a threat to the future of our planet. Among these gases is carbon dioxide (CO₂), which has a much longer atmospheric residence time compared to other greenhouse gases. One potential factor in reducing atmospheric CO₂ enrichment is plant productivity. Gross Primary Productivity (GPP) estimates the amount of CO₂ fixed during photosynthesis. The Normalized Difference Vegetation Index (NDVI) provides insight into the health of an ecosystem by measuring the density and greenness of vegetation. Therefore, it can be inferred that there is a relationship between NDVI and GPP, as greener plants are likely more productive. In this study, we used NDVI as a proxy for GPP and analyzed the effect NDVI had on CO₂ fluxes during California’s wet season between January and March 2023 in a restored tidal freshwater wetland. GPP and CO₂ flux data were obtained from the Dutch Slough AmeriFlux tower in Oakley, California. Landsat data were used to calculate the average NDVI. The influence of NDVI on GPP was assessed using linear regression. A second linear regression was then performed using NDVI and CO₂ flux, of which GPP is one component. We anticipate that wetlands with greater vegetation density will have lower CO₂ emissions.

      Because Landsat data scans in 16-day intervals, daily variation in NDVI could not be observed. This translates to a frequency discrepancy between the Landsat and AmeriFlux data, as AmeriFlux towers measure in half-hour intervals. Additionally, the wet season represented was limited by data availability, as the data before 2023 were unavailable. Despite data limitations in this study, the outlined process could be repeated in various wetland and climate classifications for further analysis of a larger sample size. This study could assist in developing strategies to increase CO₂ sequestration in an attempt to slow the effects of climate change.

      Samarth Jayadev
      Using Machine Learning to Assess Relationships between NDVI and Net Carbon Exchange During the COVID-19 Pandemic
      Samarth Jayadev
      Understanding the movement of carbon between Earth’s land surface and atmosphere is essential for ecosystem monitoring, creating climate change mitigation strategies, and assessing the carbon budget on national to global scales. Measures of greenness serve as indicators of processes such as photosynthesis that control carbon exchange and are vital in modeling of carbon fluxes. NASA’s Orbiting Carbon Observatory (OCO-2) provides high quality measurements of column-averaged CO₂ concentrations that can be used to derive net carbon exchange (NCE), a measure of CO₂ flux between terrestrial ecosystems and the atmosphere.
      From OCO-2, NCE data collected at the land nadir, land glint satellite position combined with in situ sampling can provide accurate measurements on a 1°x1° scale suitable for carbon flux characterization across the contiguous United States (CONUS). Normalized difference vegetation index (NDVI), which ranges from -1 to +1, measures the greenness of vegetation, serving as an indicator of plant density and health. This can help to understand ecosystem to carbon-cycle interactions and be leveraged for determining patterns with NCE. We examined the relationship between NDVI and NCE across CONUS during 2020 using Gradient Boosting Decision Trees (GBDT) which specialize in classifying and predicting non-linear relationships. This algorithm takes multiple weak learners (decision trees) and combines their predictions in an iterative ensemble method to improve prediction accuracy. Feature and permutation importance tests found that January and August (trough and peak NDVI, respectively) were the highest weighted predictor variables related to NCE. The dataset was split in a 90% training 10% test ratio across latitude/longitude grid cells to assess and verify model performance. Using the mean squared error loss function and hyperparameters with optimal estimators, tree depth, sample split, and learning rate the algorithm was able to converge the test predictions to match the deviance of the training data. The gradient boosting model can be applied to different months and years of NDVI/NCE to further explore these relationships or a multitude of research questions. Further studies should consider integrating land use and land cover change variables such as bare land and urbanization to improve predictions of NCE.

      Makai Ogoshi
      Deep-learning Derived Spaceborne Canopy Structural Metrics Predict Forest Carbon Fluxes
      Makai Ogoshi
      Terrestrial and airborne lidar data products describing canopy structure are potent predictors of forest carbon fluxes, but whether satellite data products produce similarly robust indicators of canopy structure is not known. The assessment of contemporary spaceborne lidar and other remote sensing data products as predictors of carbon fluxes is crucial to next generation instrument and data product design and large-spatial scale modeling. We investigated relationships between deciduous broadleaf forest canopy structure, derived from deep-learning models created with lidar data from GEDI and optical imagery from Sentinel-2, and forest carbon exchange. These included comparisons to in-situ continuous net ecosystem exchange (NEE), gross primary production (GPP), and net primary production (NPP). We find that the mean  canopy height from the gridded spaceborne product has a strong correlation with forest NPP, similar to prior analysis with ground-based lidar (portable canopy lidar; PCL). For comparison to NPP, heights taken from the gridded spaceborne product were compared by overlapping the product with nine terrestrial forest sites from the National Ecological Observatory Network (NEON). We used standard deviation of canopy height as a measure of canopy structural complexity. Complexity derived from the gridded spaceborne product does not show the same strong correlation with NPP as found when using PCL. Mean annual GPP and NEE across five years were compared to the gridded spaceborne product at six Fluxnet2015-tower sites with continuous, gap-filled carbon flux data. When compared to in-situ flux tower data, neither mean canopy height nor structural complexity strongly correlate to annual NEE or GPP. Primarily, the finding that derived spaceborne products exhibit a strong correlation between forest canopy height and NPP will advance global-scale application of forest-carbon flux predictions. Secondarily, a variety of limitations highlight shortcomings in the current terrestrial flux data network. A small number of available study sites, both spatially and temporally, and lack of resolution in vertical complexity of canopy structure both contribute to uncertainty in assessing the relationships to NEE and GPP.

      Sebastian Reed
      Porewater Methane Concentrations Vary Significantly Across A Freshwater Tidal Wetland
      Sebastian Reed
      Methane is a potent greenhouse gas that is over 80 times more powerful than CO₂ at trapping heat and accounts for an estimated 30% of global temperature rise associated with climate change. The largest natural source of methane worldwide is wetlands. Despite the role of methane in driving climate change, the magnitude of global annual wetland methane flux remains highly uncertain. This study analyzes the effects of greenness (assessed using Normalized Difference Vegetation Index; NDVI), plant species composition, rooting depth, atmospheric methane concentration, and plant longevity on porewater methane concentration at the Kimages Rice Rivers Center tidal freshwater wetland. Samples for atmospheric and porewater concentrations were conducted in situ in June 2024. For each sampling location (n = 23) we collected whole air samples (WAS) 2m above the marsh surface and porewater samples 5cm below the marsh surface. We visually assessed species composition at each sample location, with 12 species of wetland plants present overall. We used the TRY plant database to find the rooting depth, leaf nitrogen content, and lifespan of each species. Drone multispectral data from 2023 was used to estimate NDVI values. These variables were compared to the pore water methane concentration via stepwise linear regression. Leaf N content, NDVI, plant species, and WAS sampling did not show statistically significant correlation to porewater methane concentration. Rooting depth showed a slight positive correlation with porewater methane (alpha = 0.1, p = 0.08, R^2 = 0.1). Samples with only perennial plants (as opposed to annual plants) had a higher mean value of porewater methane (p = 0.1). Analyzing porewater methane provides insight as to what wetland components affect methanogenesis and methane release, which aids in assessing which plant functional traits are most responsible for driving or mitigating climate change. Results from this study and future research in this area has the potential to more accurately assess how methane cycles through wetlands to the atmosphere.

      Nohemi Rodarte
      Understanding the vertical profile of CO₂ concentration: How carbon dioxide levels change with altitude
      Nohemi Rodarte
      Carbon dioxide (CO₂) is one of the main greenhouse gasses that contribute to global warming.While the relationship between CO₂ concentrations and land cover types, such as forests and urban areas, is well documented, there is limited knowledge of how CO₂ concentrations vary with altitude at fine spatial scales. Guided by our hypothesis that CO₂ levels vary with altitude and increase with elevation, we used airborne data collected from the B200 aircraft, which flew at different altitudes (400 to 1200 feet) above the urban area of Hopewell, Virginia, between 9:40 AM and 10:40 AM. We analyzed the CO₂ concentrations recorded by the flight to obtain the median and range for each 100 feet of altitude. Our results reveal that carbon dioxide concentrations varied significantly across the range of altitudes investigated. Within the area studied, CO₂ concentrations were found to range between 410 and 470 ppm. The distribution of these concentrations along the altitude gradient shows a bimodal pattern, with notable peaks at altitudes of 700 to 800 feet and 1100 to 1200 feet. Although CO₂ levels were present at all measured altitudes, there was a noticeable drop in the mean concentration at 800 feet,which then stabilized until reaching 1,000 feet before rising again. This pattern indicates that the concentrations of this greenhouse gas are not uniformly distributed with altitude, but rather vary significantly, showing higher concentrations at certain elevations and lower concentrations at others. The CO₂ distribution fluctuates with altitude, showing higher or lower levels at specific heights rather than a smooth gradient, indicating that altitude impacts CO₂ concentrations. While we did not identify the drivers of this change, future studies could evaluate how factors such as surface emissions, atmospheric mixing, and local conditions may contribute to vertical CO₂ profiles, since the altitudes we considered in this research are within the troposphere.

      Camille Shaw
      Linking NDVI with CO₂ and CH₄ Fluxes: Insights into Vegetation and Urban Source-Sink Dynamics in the Great Dismal Swamp
      Camille Shaw
      In recent years, carbon dioxide, methane, and other greenhouse gases have gained attention because of their contribution to the rise in Earth’s global mean temperature. Methane and carbon dioxide have various sources and sinks, but an expanding array of sources have created a need to assess ongoing change in carbon balance. This study aims to quantify the relationship between Normalized Difference Vegetation Index, or NDVI, and methane and carbon dioxide fluxes. We measured carbon dioxide and methane concentrations within the boundary layer using the PICARRO instrument, focusing on the Great Dismal Swamp, a forested wetland, and surrounding areas in the Eastern Mid-Atlantic Region. Data collection occurred at various times of day and along different flight paths in 2016, 2017, and 2024, with each year representing data from a single season, either spring or fall, for temporal analysis. We calculated methane and carbon dioxide fluxes along the flight paths using airborne eddy covariance, a method for capturing accurate flux measurements while accounting for the mixing of gases in the boundary layer caused by heat. Additionally, we calculated NDVI for this area using NASA’s Landsat 8 and 9 satellite imagery. Analysis of the afternoon flight data revealed a negative linear correlation between NDVI and carbon dioxide flux. Urban areas, characterized by low NDVI, exhibit a positive carbon dioxide flux as a consequence of emissions from vehicles, while forested areas, with high NDVI, show a negative carbon dioxide flux because of photosynthesis. In contrast, methane flux shows minimal correlation with NDVI. The lack of correlation arises because forested wetlands, with high NDVI, emit substantial amounts of methane, while urban areas, despite having low NDVI, still produce significant methane emissions from landfills and industrial activities. Future research could further investigate how seasonal and diurnal variations influence the correlations between NDVI and greenhouse gases by collecting comprehensive data across all seasons within a given year and at various times of the day.

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