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NASA Celebrates Hispanic Heritage Month 2024


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In honor of Hispanic Heritage Month, we recognize Hispanic astronauts who have flown in space. The table below lists these individuals of various nationalities who have made significant contributions to their space programs. The first Hispanic astronauts completed short flights to a Soviet space station and aboard the space shuttle. In the past 23 years, many more have completed flights to the International Space Station and contributed to its assembly, operations, and research activities.  

Table of Hispanic astronauts who have flown in space
Table of Hispanic astronauts who have flown in space.

Arnaldo Tamayo Méndez of Cuba holds the title of the first person of Hispanic heritage to fly in space. He spent eight days aboard the Salyut-6 space station in September 1980 as part of the Soviet Union’s Interkosmos program to fly cosmonauts from friendly socialist countries. The first Hispanic to fly on the space shuttle, Payload Specialist Rodolfo Neri Vela of Mexico, also introduced tortillas to astronauts’ on board menus during his flight on STS-61B in November 1985. Tortillas continue to be a staple on the space station today, for everything from breakfast tacos, to burgers, sandwiches, and pizzas. Selected as an astronaut in 1980, Costa Rican-born Franklin R. Chang-Díaz holds the honor as the first Hispanic American in space. He flew in space a record-tying seven times, including one visit to the Russian space station Mir and one to the International Space Station.

Cuban cosmonaut Arnaldo Tamayo Méndez Rodolfo Neri Vela enjoys a trend-setting tortilla during the STS-61B mission NASA astronaut Franklin R. Chang-Díaz
Left: Portrait of Cuban cosmonaut Arnaldo Tamayo Méndez. Middle: Mexican payload specialist Rodolfo Neri Vela enjoys a trend-setting tortilla during the STS-61B mission. Right: Portrait of NASA astronaut Franklin R. Chang-Díaz.

Franklin R. Chang-Díaz

Chang-Díaz’s first flight, STS-61C aboard space shuttle Columbia, took place in January 1986, a six-day flight to deploy a communications satellite and to remotely observe Halley’s comet. The crew included two future NASA administrators, NASA astronauts Charles F. Bolden and U.S. Senator (D-FL) C. William “Bill” Nelson. The flight landed just 10 days before the tragic loss of space shuttle Challenger. His next mission, STS 34 aboard Atlantis, in October 1989 saw the deployment of the Galileo spacecraft to explore Jupiter with an orbiter and an atmospheric probe. Chang-Díaz launched on his third mission, STS 46 in July 1992, an eight-day flight aboard Atlantis to test fly the first Tethered Satellite System (TSS-1).

Franklin R. Chang-Díaz, center, the first Hispanic American astronaut, with his fellow STS-61C crew members Chang-Díaz, and the STS-34 crew Chang-Díaz, with the STS-46 crew
Left: Franklin R. Chang-Díaz, center, the first Hispanic American astronaut, with his fellow STS-61C crew members. Middle: Chang-Díaz, center, and the STS-34 crew. Right: Chang-Díaz, upper right, with the STS-46 crew.

Chang-Díaz returned to space for his fourth mission in January 1994 aboard Discovery. The eight-day STS-60 flight comprised the first flight in the Shuttle-Mir program, with Russian cosmonaut Sergey K. Krikalev a member of the crew. Chang-Díaz launched on his fifth flight in February 1996, the 16-day STS-75 mission aboard Columbia to refly the TSS. On his sixth mission in June 1998, the STS-91 crew docked Discovery with the Russian space station Mir and returned astronaut Andrew S.W. Thomas to earth, the final Shuttle-Mir mission.

Franklin R. Chang-Díaz, with the STS-60 crew Chang-Díaz with his STS-75 crew mates Chang-Díaz, with the STS-91 and Mir 25 crews
Left: Franklin R. Chang-Díaz, lower left, with the STS-60 crew. Middle: Chang-Díaz, left, with his STS-75 crew mates. Right: Chang-Díaz, with the STS-91 and Mir 25 crews.

During his record-tying seventh trip into space, Chang-Díaz made his only visit to the space station. The main goals of Endeavour’s STS-111 mission in June 2002 included the exchange of the Expedition 4 and 5 crews and the resupply of the station using the Leonardo Multi-Purpose Logistics Module (MPLM). Two new research facilities rode in the MPLM, the fifth Expedite the Processing of Experiments to the Space Station (EXPRESS) rack and the Microgravity Sciences Glovebox. Chang-Díaz completed three spacewalks with his fellow mission specialist, French astronaut Philippe Perrin, to install the Mobile Base System portion of the Canadarm2’s remote manipulator system and perform maintenance tasks on the station.

NASA astronaut Franklin R. Chang-Díaz with his STS-111 crewmates and the Expedition 4 and 5 crews Chang-Díaz during the first STS-111 spacewalk Chang-Díaz in Endeavour’s middeck following undocking from the space station
Left: NASA astronaut Franklin R. Chang-Díaz, left of center, with his STS-111 crewmates and the Expedition 4 and 5 crews. Middle: Chang-Díaz during the first STS-111 spacewalk. Right: Chang-Díaz in Endeavour’s middeck following undocking from the space station.

Sidney M. Gutierrez

NASA selected New Mexico native Sidney M. Gutierrez as an astronaut in 1984. On his first mission in June 1991, he served as the pilot of Columbia on the STS-40 Spacelab Life Sciences-1 mission, a nine-day flight dedicated to investigating the responses of the human body to weightlessness. He also served as a test subject for several of the experiments. During his second mission in April 1994, Gutierrez served as the commander of STS-59, the Space Radar Laboratory-1 flight, an 11-day mission aboard Endeavour. The payload included a synthetic aperture imaging radar.

NASA astronaut Sidney M. Gutierrez with his STS-40 crew mates Gutierrez with the STS-59 crew.
Left: NASA astronaut Sidney M. Gutierrez, center, with his STS-40 crew mates. Right: Gutierrez, center, with the STS-59 crew.

Ellen Ochoa

Selected as the first female Hispanic astronaut in 1990, Ellen Ochoa completed four spaceflights and then served as the first Hispanic director of NASA’s Johnson Space Center in Houston. On her first mission in April 1993, she served as a mission specialist on the nine-day STS-56 flight, the second Atmospheric Laboratory for Applications and Science (ATLAS) mission aboard Discovery. An accomplished flautist, she played her flute during the flight. On her second flight, STS-66 in March 1994, Ochoa flew aboard Atlantis and operated the experiments of the ATLAS-3 payload during the 11-day mission.

Ellen Ochoa and the rest of the STS-56 crew Ochoa plays the flute on Discovery’s flight deck Ochoa and the rest of the STS-66 crew
Left: Ellen Ochoa, top left, and the rest of the STS-56 crew. Middle: Ochoa plays the flute on Discovery’s flight deck. Right: Ochoa, top left, and the rest of the STS-66 crew.

Ochoa holds the distinction as the first Hispanic astronaut to visit the space station, making her first visit in May 1999 as a mission specialist aboard Discovery’s 10-day STS-96 mission. The goals of the mission – only the second shuttle flight to the station that, at the time, comprised only two modules – included the transfer of two tons of logistics to the station, launched inside a Spacehab double module, and the delivery of the Russian Strela cargo crane.

The space station as seen from STS-96 NASA astronaut Ellen Ochoa with the STS-96 crew in the Unity Node 1 Ochoa with fellow STS-96 crewmembers Julie Payette of the Canadian Space Agency in the Zarya module.
Left: The space station as seen from STS-96. Middle: NASA astronaut Ellen Ochoa, lower right, with the STS-96 crew in the Unity Node 1. Right: Ochoa, bottom, with fellow STS-96 crewmembers Julie Payette of the Canadian Space Agency in the Zarya module.

Ochoa returned to a much-enlarged space station aboard space shuttle Atlantis in April 2002 during the STS-110 mission that delivered the 13-ton S0 truss – the center segment section to which future truss segments were later attached. Ochoa operated the Space Station Remote Manipulator System (SSRMS), also known as Canadarm2, to lift the S0 truss from the shuttle’s payload bay and attach it atop the Destiny module. The S0 truss also contained the Mobile Transporter to allow the SSRMS to translate up and down the trusses. Ochoa was named as JSC’s deputy director in 2007, then as JSC’s first Hispanic director in 2013. She served in that position until her retirement from NASA in 2018.

 NASA astronaut Ellen Ochoa operating Canadarm2 The space station as seen from the departing STS-110, showing the S0 truss mounted on Destiny Portrait of Ellen Ochoa as director of NASA’s Johnson Space Center in Houston
Left: NASA astronaut Ellen Ochoa operating Canadarm2 in the Destiny module. Middle: The space station as seen from the departing STS-110, showing the S0 truss mounted on Destiny. Right: Portrait of Ochoa as director of NASA’s Johnson Space Center in Houston.

Michael E. Lopez-Alegria

NASA selected Michael E. “LA” Lopez-Alegria, born in Madrid, Spain, as an astronaut in 1992. On his first spaceflight, he served as a mission specialist on STS-73, the second flight of the United States Microgravity Laboratory. The 16-day mission aboard Columbia in October 1995 included 37 investigations supported by 11 facilities, with the seven-member crew working around the clock in two shifts in a Spacelab module.

Michael E. Lopez-Alegria with the rest of the STS-73 crew inside the Spacelab module. Lopez-Alegria working on biological experiment in the Spacelab module
Left: Michael E. Lopez-Alegria, center, with the rest of the STS-73 crew inside the Spacelab module. Right: Lopez-Alegria working on biological experiment in the Spacelab module.

Lopez-Alegria served as a mission specialist on STS-92 during his first visit to the space station. He and his six crewmates launched aboard Discovery in  October 2000, the 100th launch of the program and the last to visit an unoccupied station. At the time, the station comprised just three modules. During the mission, the STS-92 crew installed the Z1 truss atop the Unity module, four Control Moment Gyros, and the third Pressurized Mating Adaptor. The Z1 truss  enabled the addition of solar arrays and radiators on the subsequent assembly flight and also contained high-rate communications equipment including the first Space-to-Ground antenna. Lopez-Alegria participated in two of the mission’s four spacewalks with Peter J. “Jeff” Wisoff to complete the assembly tasks. During their last spacewalk, the two conducted the first flight evaluation at the station of the Simplified Aid for EVA Rescue (SAFER), a propulsive backpack to be used by astronauts should they become detached from the spacecraft. The STS-92 crew left the station ready for its first inhabitants, and indeed less than two weeks later, the first Expedition crew arrived to begin permanent residency in low Earth orbit.

NASA astronaut Michael E. Lopez-Alegria working outside the space station during STS-92 Lopez-Alegria tests the Simplified Aid for EVA Rescue as fellow NASA astronaut Peter J. “Jeff” Wisoff looks on The space station as seen from Discovery shortly after undocking, showing the Z1 Truss with the Space-to-Ground Antenna at top and the third Pressurized Mating Adaptor at bottom.
Left: NASA astronaut Michael E. Lopez-Alegria working outside the space station during STS-92. Middle: Lopez-Alegria, left, tests the Simplified Aid for EVA Rescue as fellow NASA astronaut Peter J. “Jeff” Wisoff looks on. Right: The space station as seen from Discovery shortly after undocking, showing the Z1 Truss with the Space-to-Ground Antenna at top and the third Pressurized Mating Adaptor at bottom.

For his third flight into space, Lopez-Alegria returned to the station in November 2002 during the STS-113 mission, the facility now permanently occupied and having grown significantly in the intervening two years. The primary tasks for the STS-113 crew included adding the P1 truss on the station’s port side, installing the Crew Equipment Translation Aid (CETA) cart, and assisting in the exchange between the Expedition 5 and 6 crews. Lopez-Alegria and fellow STS-113 mission specialist John B. Harrington conducted three spacewalks to complete the installation of the P1 truss and the CETA cart. After STS-113, assembly of the station came to a temporary halt following the Feb. 1, 2003, Columbia accident, and the subsequent grounding of the space shuttle fleet. Flights did not resume until September 2006.

NASA astronaut Michael E. Lopez-Alegria during the first STS-113 spacewalk. Lopez-Alegria, second from right in the middle row, posing in the Destiny module with his STS-113 crewmates, as well as the Expedition 5 and 6 crews The space station as seen by the departing STS-113 crew, with the newly installed P1 truss visible at right
Left: NASA astronaut Michael E. Lopez-Alegria during the first STS-113 spacewalk.  Middle: Lopez-Alegria, second from right in the middle row, posing in the Destiny module with his STS-113 crewmates, as well as the Expedition 5 and 6 crews. Right: The space station as seen by the departing STS-113 crew, with the newly installed P1 truss visible at right.

Lopez-Alegria returned to the space station again shortly after assembly resumed. For his fourth spaceflight, he launched aboard Soyuz TMA9 in September 2006, from the Baikonur Cosmodrome in Kazakhstan,. Mikhail V. Tyurin of Roscosmos accompanied him during the 215-day mission, to that time the longest space station expedition, was Mikhail V. Tyurin of Roscosmos. European Space Agency (ESA) astronaut Thomas A. Reiter, onboard the station since July 2006, became part of the Expedition 14 crew. As Commander of Expedition 14, Lopez-Alegria oversaw one of the most complex set of activities in the assembly of the station – the reconfiguration of its power and cooling systems. A week before his arrival, the STS-115 mission had delivered the second set of solar arrays to the station as part of the P3/P4 truss segment, positioning them outboard of the P1 segment. As part of the reconfiguration, the port side P6 array mounted atop the Z1 truss needed to be retracted to prevent interference with the rotation of the new arrays, a task that was completed during the visiting STS-116 mission in December that also added the P5 short spacer to the port side truss. That mission brought NASA astronaut Sunita L. “Suni” Williams to the station as a new addition to Expedition 14 and returned Reiter back to Earth. During Expedition 14, Lopez-Alegria took part in five spacewalks, two in Orlan spacesuits with Tyurin to conduct work on the outside of the Russian segment and three in American spacesuits, with Williams to reconfigure the cooling system of the U.S. segment. He accumulated a total of 67 hours and 40 minutes over 10 spacewalks – still the record among American astronauts. Lopez-Alegria also conducted a variety of scientific experiments.

Space station configuration when NASA astronaut Michael E. Lopez-Alegria arrived in September 2006 Lopez-Alegria, back row middle, with STS-116 and Expedition 14 crew members Celebrating the holidays aboard the space station
Left: Space station configuration when NASA astronaut Michael E. Lopez-Alegria arrived in September 2006. Middle: Lopez-Alegria, back row middle, with STS-116 and Expedition 14 crew members. Right: Celebrating the holidays aboard the space station.

NASA astronaut Michael E. Lopez-Alegria conducting a session of the Canadian TRAC experiment in the Destiny module Michael E. Lopez-Alegria conducts maintenance on the exterior of the Russian segment The space station’s configuration at the end of Lopez-Alegria’s mission
Left: NASA astronaut Michael E. Lopez-Alegria conducting a session of the Canadian TRAC experiment in the Destiny module. Middle: In an Orlan suit, Lopez-Alegria conducts maintenance on the exterior of the Russian segment. Right: The space station’s configuration at the end of Lopez-Alegria’s mission – note the retracted P6 solar array.

Lopez-Alegria retired from NASA in 2012, joining Axiom Space shortly thereafter. In April 2022, he commanded the Ax-1 mission, the first commercial astronaut mission to the space station. He and his three crewmates spent 17 days aboard, conducting a variety of experiments. Lopez-Alegria returned to space as commander of the Ax-3 mission in January 2024. He and his three multi-national crewmates spent 22 days aboard the space station conducting numerous experiments. Across his six missions, Lopez-Alegria accumulated a total of 297 days in space.

Axiom astronaut Michael E. Lopez-Alegria floats into the space station during the Ax-1 mission Lopez-Alegria and the rest of the Ax-1 crew. The 11 crew members aboard the space station during the Ax-1 mission, with Lopez-Alegria at far right.
Left: Axiom Space astronaut Michael E. Lopez-Alegria floats into the space station during the Ax-1 mission.
Middle: Lopez-Alegria, second from right, and the rest of the Ax-1 crew. Right: The 11 crew members
aboard the space station during the Ax-1 mission, with Lopez-Alegria at far right.

Axiom Space astronaut Michael E. Lopez-Alegria answers questions from the space station’s Cupola during the Ax-3 mission Lopez-Alegria, second from left, and the rest of the Ax-3 crew The 11 members of the Expedition 70 and Ax-3 crews, with Lopez-Alegria at far left
Left: Axiom Space astronaut Michael E. Lopez-Alegria answers questions from the space station’s Cupola during the Ax-3 mission. Middle: Lopez-Alegria, second from left, and the rest of the Ax-3 crew. Right: The 11 members of the Expedition 70 and Ax-3 crews, with Lopez-Alegria at far left.

Carlos I. Noriega

In 1994, NASA selected Carlos I. Noriega as the first Peruvian-born astronaut. On his first spaceflight in May 1997, he served as a mission specialist aboard STS-84, the sixth Shuttle-Mir docking mission. During the nine-day flight, the crew resupplied the Mir space station, brought NASA astronaut C. Michael Foale to the Russian outpost, and returned Jerry M. Linenger to Earth.

Carlos I. Noriega sets up an experiment during the STS-84 mission Noriega working on an experiment in the Spacehab module The 10 members of the STS-84 and Mir resident crew, with Noriega
Left: Carlos I. Noriega sets up an experiment during the STS-84 mission. Middle: Noriega working on an experiment in the Spacecab module. Right: The 10 members of the STS-84 and Mir resident crew, with Noriega at upper right.

In December 2000, Noriega launched on his second mission, aboard Endeavour with his four crewmates on STS-97, their primary goal to install the P6 truss segment with the first set of solar arrays and radiators atop the Z1 truss. STS-97 marked the first time a shuttle visited the station after its occupancy began, but given the busy spacewalk schedule, the hatches between the two vehicles were only open for 24 hours. Noriega and fellow mission specialist Joseph R. Tanner conducted three spacewalks to complete the P6 installation and other assembly tasks. The new solar arrays generated enough power for the arrival of the U.S. laboratory module Destiny early in 2001 and the start of intensive research aboard the space station.

NASA astronaut Carlos I. Noriega waves to the camera as he installs the P6 truss and solar arrays. Noriega with the STS-97 and Expedition 1 crews in the Zarya Service Module. The space station as seen from the departing STS-97 showing the newly deployed P6 solar arrays.
Left: NASA astronaut Carlos I. Noriega waves to the camera as he installs the P6 truss and solar arrays. Middle: Noriega, center, with the STS-97 and Expedition 1 crews in the Zarya Service Module. Right: The space station as seen from the departing STS-97 showing the newly deployed P6 solar arrays.

Pedro Duque

The European Space Agency (ESA) selected Pedro Duque, born in Madrid, Spain, as an astronaut in 1992. Four years later, he joined NASA’s astronaut class of 1996 in training and two years later certified as a mission specialist. His first launch into space took place in October 1998 on Discovery’s STS-95 mission, the nine-day flight that saw astronaut John H. Glenn’s return to space. Duque returned to space in October 2003 aboard Soyuz TMA3, conducting experiments aboard the space station as part of his Cervantes visiting mission. He returned to Earth 10 days later aboard Soyuz TMA2.

Spanish astronaut Pedro Duque, lower left, representing the European Space Agency, with his STS-95 crewmates Duque conducting an experiment in the Microgravity Science Glovebox aboard the space station Duque with his Expedition 7 and 8 crewmates
Left: Spanish astronaut Pedro Duque, lower left, representing the European Space Agency, with his STS-95 crewmates. Middle: Duque conducting an experiment in the Microgravity Science Glovebox aboard the space station. Right: Duque, center, with his Expedition 7 and 8 crewmates.

Marcos C. Pontes

The Brazilian Space Agency selected Marcos C. Pontes as an astronaut in 1998. He trained with NASA’s astronaut class of 1998 and certified as a mission specialist two years later. Pontes made his one and only spaceflight in March 2006 aboard Soyuz TMA8, carrying out eight experiments. He returned to Earth 10 days later aboard Soyuz TMA7.

Brazilian astronaut Marcos Pontes, center at rear, with his Expedition 12 and 13 crewmates Pontes works on an experiment in the Destiny Laboratory Module Pontes at work on an experiment in the Russian Zvezda module.
Left: Brazilian astronaut Marcos Pontes, center at rear, with his Expedition 12 and 13 crewmates. Middle: Pontes works on an experiment in the Destiny Laboratory Module. Right: Pontes at work on an experiment in the Russian Zvezda module.

John D. “Danny” Olivas

Selected as a member of NASA’s Astronaut Class of 1998, John D. “Danny” Olivas visited the space station on two occasions as a shuttle mission specialist. His first visit took place aboard Atlantis during the STS-117 mission in June 2007. During the flight, Olivas and fellow mission specialist James F. Reilly conducted two of the four spacewalks to install the S3/S4 truss segment that included the third set of solar arrays. To prevent interfering with the rotation of the new arrays, the crew retracted the starboard P6 array mounted atop the Z1 truss. The STS-117 mission also served as a crew exchange flight, with NASA astronaut Clayton C. Anderson replacing Suni Williams as a member of Expedition 15.

NASA astronaut John D. “Danny” Olivas during an STS-117 spacewalk working on the S3/S4 truss installation. Olivas, back row at right, with the STS-117 and Expedition 15 crews The space station as seen by the departing STS-117 crew, showing the new set of starboard solar arrays at right.
Left: NASA astronaut John D. “Danny” Olivas during an STS-117 spacewalk working on the S3/S4 truss installation. Middle: Olivas, back row at right, with the STS-117 and Expedition 15 crews. Right: The space station as seen by the departing STS-117 crew, showing the new set of starboard solar arrays at right.

On his return to the station, Olivas found it a bit more crowded – three months earlier, the permanent crew aboard the station had expanded from three to six. He and his crewmates launched aboard Discovery on the STS-128 mission in August 2009. The shuttle’s payload bay contained the Leonardo MPLM bringing supplies to help maintain a 6-person crew on the space station, including three systems racks: a crew quarters, an Air Revitalization System  rack, and the Combined Operational Load Bearing External Resistance Treadmill (COLBERT) for crew exercise – as well as three research racks – the Fluid Integrated Rack , the Materials Science Research Rack, and the second Minus Eighty-degree Laboratory Freezer for ISS (MELFI). Olivas participated in three spacewalks to replace the Ammonia Tank Assembly  on the P1 truss and to retrieve two experiments from the European Columbus module’s External Payload Facility. STS-128 also completed the final shuttle-based crew exchange, with NASA astronauts Nicole P. Stott and Timothy L. Kopra exchanging places as Expedition 20 crewmembers.

NASA astronaut John D. “Danny” Olivas poses during spacewalk work on the Ammonia Tank Assembly. NASA astronaut John D. “Danny” Olivas eating a chocolate and peanut butter snack NASA astronaut John D. “Danny” Olivas, at center, with the STS-128 and Expedition 20 crews
Left:NASA astronaut John D. “Danny” Olivas poses during spacewalk work on the Ammonia Tank Assembly. Middle: Olivas eating a chocolate and peanut butter snack. Right: Olivas, at center, with the STS-128 and Expedition 20 crews.

George D. Zamka

Selected as a NASA astronaut in 1998, George D. Zamka completed his first space flight as pilot on Discovery’s STS-120 mission. Launching in October 2007, Zamka and his crewmates brought the Harmony Node 2 module to the station, temporarily berthing it on the Unity Node 1’s port side until the Expedition 16 crew relocated it to Destiny’s forward hatch. In its final location, Harmony enabled the later installation of the European and Japanese elements. The crew also relocated the P6 truss segment from atop Z1 to the outboard port truss. During the redeployment of the P6 solar arrays, one of the arrays developed a tear that required repair using a cufflink-like device to sew up the gap in the panel. STS-120 also conducted a crew exchange, with NASA astronauts Daniel M. Tani and Clay Anderson exchanging places as members of Expedition 16. As the STS-120 pilot, Zamka completed the undocking from the station and the departure fly-around maneuver.

NASA astronaut George D. Zamka holding the cufflink device used to repair the torn solar array Zamka, lower right, with the STS-120 and Expedition 16 crews The space station as seen from STS-120 departing, showing the newly delivered Harmony Node 2 module
Left: NASA astronaut George D. Zamka holding the cufflink device used to repair the torn solar array. Middle: Zamka, lower right, with the STS-120 and Expedition 16 crews. Right: The space station as seen from STS-120 departing, showing the newly delivered Harmony Node 2 module temporarily berthed at the Unity Node 1 and the relocated and redeployed P6 truss segment and solar arrays at left.

When he returned to the orbiting lab in February 2010, Zamka did so as commander of space shuttle Endeavour’s STS-130 mission. After guiding the shuttle to a successful docking with the station, Zamka and his crewmates, along with the Expedition 22 crew, installed the Tranquility Node 3 module to Unity’s port side and activated the new element. The new module provided accommodations for life support and habitation facilities for the station’s six-person crew. The crew removed the Cupola from its launch position at the end of Tranquility and relocated it to the module’s Earth-facing port. The Cupola’s six trapezoidal and one circular center window provide crews not only visibility for approaching visiting vehicles, but also spectacular views of their home planet passing by below. 

NASA astronaut George D. Zamka peering through one of the Cupola’s windows Zamka with the STS-130 and Expedition 22 crews. The space station as seen from the departing STS-130, showing the Tranquility Node 3 and Cupola berthed at the Unity Node 1, left of center.
Left: NASA astronaut George D. Zamka peering through one of the Cupola’s windows. Middle: Zamka, front row second from right, with the STS-130 and Expedition 22 crews. Right: The space station as seem from the departing STS-130, showing the Tranquility Node 3 and Cupola berthed at the Unity Node 1, left of center.

Joseph M. “Joe” Acaba

Joseph M. “Joe” Acaba was selected in 2004 as part of NASA’s Educator Astronaut Program and qualified as a mission specialist. His first flight into space was aboard STS-119 in March 2009. Discovery brought up the S6 final truss segment with the fourth and final set of solar arrays, bringing the U.S. segment of the station’s useable power generating capability between 42 and 60 kilowatts. Acaba completed two of the mission’s three spacewalks, one with fellow mission specialist Steven R. Swanson and the other with fellow educator-astronaut and mission specialist Richard R. “Ricky” Arnold. During the STS-119 mission, Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) replaced NASA astronaut Sandra H. Magnus as a member of the Expedition 18 crew.

NASA astronaut Joseph M. Acaba during the third STS-119 spacewalk Acaba with the STS-119 and Expedition 18 crews The space station as seen from the departing STS-119, with the newly added S6 truss segment and solar arrays
Left: NASA astronaut Joseph M. Acaba during the third STS-119 spacewalk. Middle: Acaba, front row at right, with the STS-119 and Expedition 18 crews. Right: The space station as seen from the departing STS-119, with the newly added S6 truss segment and solar arrays, at right.

For his second visit to the station, Acaba stayed for 125 days as part of Expeditions 31 and 32, launching in May 2012 from Kazakhstan aboard Soyuz TMA-04M. A week after arriving, Acaba and his crewmates welcomed the first commercial vehicle to dock with the space station, the SpaceX Dragon cargo resupply vehicle on its Demo-2 mission carrying food, water, scientific experiments and other supplies. The Expedition 31 crew loaded the Dragon spacecraft with cargo and experiment samples for return to Earth. The crew observed and photographed a rare celestial event, a transit of Venus across the Sun on June 5. In addition to conducting numerous science experiments, Acaba helped fire prevention icon Smokey the Bear celebrate his 68th birthday.

NASA astronaut Joseph M. Acaba with his Expedition 31 crewmates inside the SpaceX Dragon resupply vehicle NASA astronaut Joseph M. Acaba running on the COLBERT treadmill. NASA astronaut Joseph M. Acaba refracted in a globule of water.
Left: NASA astronaut Joseph M. Acaba, top right, with his Expedition 31 crewmates inside the SpaceX Dragon resupply vehicle. Middle: Acaba running on the COLBERT treadmill. Right: Acaba refracted in a globule of water.

NASA astronaut Joseph M. Acaba drawing a blood sample from Akihiko Hoshide of the Japan Aerospace Exploration Agency NASA astronaut Joseph M. Acaba with a toy Smokey the Bear in the Cupola to help celebrate the forest fire prevention icon’s 68th birthday NASA astronaut Joseph M. Acaba, lower right, with this Expedition 32 crewmates.
Left: NASA astronaut Joseph M. Acaba, right, drawing a blood sample from Akihiko Hoshide of the Japan Aerospace Exploration Agency. Middle: Acaba with a toy Smokey the Bear in the Cupola to help celebrate the forest fire prevention icon’s 68th birthday. Right: Acaba, lower right, with this Expedition 32 crewmates.

Acaba returned to the space station five years later as a member of Expedition 53 and 54, launching in September 2017, aboard Soyuz MS-06 Acaba joined NASA astronaut Randolph J. “Randy” Bresnik for a nearly seven-hour spacewalk to lubricate the newly installed replacement Latching End Effector on the SSRMS. Acaba continued with the research program and celebrated his Puerto Rican heritage with several events. He returned to Earth after a 168-day flight. Over his three missions, Acaba accumulated 306 days in space and nearly 20 hours in spacewalk time. Since February 2023, he has served as the chief of the astronaut office.

NASA astronaut Joseph M. Acaba conducting an experiment in the Microgravity Sciences Glovebox. Acaba showing Puerto Rico pride During a spacewalk, Acaba is lubricating the Candarm2 Latching End Effector Acaba with his Expedition 53 crewmates.
Left: NASA astronaut Joseph M. Acaba conducting an experiment in the Microgravity Sciences Glovebox. Middle left: In the Cupola, Acaba showing Puerto Rico pride. Middle right: During a spacewalk, Acaba is lubricating the Candarm2 Latching End Effector. Right: Acaba, left, with his Expedition 53 crewmates.

NASA astronaut Joseph M. Acaba working with the Biological Research in Canisters experiment. Acaba speaking with the Puerto Rico Institute of Robotics. During the holidays, Acaba participating in a parranda by video hhm-2023-82-acaba-exp-54-crew-photo-iss0
Left: NASA astronaut Joseph M. Acaba working with the Biological Research in Canisters experiment. Middle left: Acaba speaking with the Puerto Rico Institute of Robotics. Middle right: During the holidays, Acaba participating in a parranda by video. Right: Acaba, upper left, with his Expedition 54 crewmates.

José M. Hernández

Selected in 2004 as a NASA astronaut, José M. Hernández made his single visit to the space station during the STS-128 mission. Launched aboard space shuttle Discovery in August 2009, Hernández operated both the shuttle and station robotic arms to move the Leonardo MPLM back and forth and translate astronauts during the mission’s three spacewalks. He participated in the transfer and installation of the three systems racks and the three research racks aboard the orbiting laboratory. STS-128 also completed the final shuttle-based crew exchange, with Stott replacing Kopra as an Expedition 20 crew member. In collaboration with Amazon Studios, NASA is helping chronicle Hernández’ life and career through the film “A Million Miles Away,” telling the story of his journey from migrant farmer to NASA space explorer.

NASA astronaut José M. Hernández operating the shuttle’s robotic arm to transfer the Leonardo Multipurpose Logistics Module (MPLM) to the station. NASA astronaut José M. Hernández operating the station’s robotic arm to return the MPLM to the shuttle’s payload bay. NASA astronaut José M. Hernández with the STS-128 and Expedition 20 crews
Left:  NASA astronaut José M. Hernández operating the shuttle’s robotic arm to transfer the Leonardo Multipurpose Logistics Module (MPLM) to the station. Middle: Hernández operating the station’s robotic arm to return the MPLM to the shuttle’s payload bay. Right: Hernández, front row center, with the STS-128 and Expedition 20 crews.

Serena M. Auñón-Chancellor

Serena M. Auñón-Chancellor was selected as a member of NASA’s Astronaut Class of 2009 and made her first spaceflight nine years later. She launched aboard Soyuz MS-09 in June 2018and began work on the more than 300 research investigations she carried out during her stay aboard the orbiting laboratory. Auñón-Chancellor returned to Earth after completing a 197-day flight.

NASA astronaut Serena M. Auñón-Chancellor conducting the AngieX Cancer Therapy experiment in the Microgravity Sciences Glovebox. NASA astronaut Serena M. Auñón-Chancellor completing a session of the Eye Exam NASA astronaut Serena M. Auñón-Chancellor posing with her Expedition 56 crewmates in the Harmony Node 2 module.
Left: NASA astronaut Serena M. Auñón-Chancellor conducting the AngieX Cancer Therapy experiment in the Microgravity Sciences Glovebox. Middle: Auñón-Chancellor completing a session of the Eye Exam – Fundoscope experiment to help understand vision changes in microgravity. Right: Auñón-Chancellor, top, posing with her Expedition 56 crewmates in the Harmony Node 2 module.

NASA astronaut Serena M. Auñón-Chancellor working on the BioServe Protein Crystalography-1 experiment Expedition 57 crew members in their best Halloween outfits NASA astronaut Serena M. Auñón-Chancellor and her Expedition 57 crewmates in the Destiny module
Left: NASA astronaut Serena M. Auñón-Chancellor working on the BioServe Protein Crystalography-1 experiment. Middle: Expedition 57 crew members in their best Halloween outfits – Sergei V. Prokopiev of Roscosmos, left, as Elvis, ESA astronaut Alexander Gerst as Darth Vader, and Auñón-Chancellor as a mad scientist. Right: Auñón-Chancellor and her Expedition 57 crewmates in the Destiny module.

Francisco “Frank” C. Rubio

Selected as an astronaut by NASA in 2017, Dr. Francisco “Frank” C. Rubio began his first trip to space in September 2022, with Russian cosmonauts Sergei V. Prokopyev and Dmitri A. Petelin aboard Soyuz MS-22, for a planned six-month stay aboard the space station. A leak aboard their Soyuz MS-22 spacecraft in December resulted in the loss of its coolant, and they could no longer rely on it to return to Earth. Roscosmos sent the replacement Soyuz MS-23 to the station in February 2023. The incident extended their mission to over one year. On Sept. 11, Rubio broke the record of 355 days for the longest single flight by an American astronaut, set by Mark T. Vande Hei in March 2022. Prokopyev, Petelin, and Rubio landed on Sept. 27 after a 371-day flight, the longest aboard the space station up to that time.

NASA astronaut Francisco “Frank” C. Rubio receives his gold astronaut pin from Japan Aerospace Exploration Agency astronaut and fellow Expedition 68 crew member Koichi Wakata hhm-2023-93-rubio-exp-68-nov-15-2022-iss NASA astronaut Francisco “Frank” C. Rubio with Russian cosmonauts Sergey V. Prokopyev and Dmitri A. Petelin with a cake with “356” written on it to signify they surpassed the previous record
of 355 days as the longest flight aboard the space station.
Left: Shortly after arriving at the space station, NASA astronaut Francisco “Frank” C. Rubio receives his gold astronaut pin from Japan Aerospace Exploration Agency astronaut and fellow Expedition 68 crew member Koichi Wakata. Middle: Rubio during one of his two spacewalks. Right: Rubio, left, with Russian cosmonauts Sergey V. Prokopyev and Dmitri A. Petelin with a cake with “356” written on it to signify they surpassed the previous record of 355 days as the longest flight aboard the space station up to that time.

To be continued…

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      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.

      Return to 2024 SARP Closeout Share
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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 10 min read SARP East 2024 Hydroecology Group
      Article 21 mins ago View the full article
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