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By NASA
4 min read
NASA Satellites Reveal Abrupt Drop in Global Freshwater Levels
Earth (ESD) Earth Home Explore Climate Change Science in Action Multimedia Data For Researchers GRACE satellites measure gravity as they orbit the planet to reveal shifting levels of water on the Earth (artist’s concept). NASA/JPL-Caltech An international team of scientists using observations from NASA-German satellites found evidence that Earth’s total amount of freshwater dropped abruptly starting in May 2014 and has remained low ever since. Reporting in Surveys in Geophysics, the researchers suggested the shift could indicate Earth’s continents have entered a persistently drier phase.
From 2015 through 2023, satellite measurements showed that the average amount of freshwater stored on land — that includes liquid surface water like lakes and rivers, plus water in aquifers underground — was 290 cubic miles (1,200 cubic km) lower than the average levels from 2002 through 2014, said Matthew Rodell, one of the study authors and a hydrologist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “That’s two and a half times the volume of Lake Erie lost.”
During times of drought, along with the modern expansion of irrigated agriculture, farms and cities must rely more heavily on groundwater, which can lead to a cycle of declining underground water supplies: freshwater supplies become depleted, rain and snow fail to replenish them, and more groundwater is pumped. The reduction in available water puts a strain on farmers and communities, potentially leading to famine, conflicts, poverty, and an increased risk of disease when people turn to contaminated water sources, according to a UN report on water stress published in 2024.
The team of researchers identified this abrupt, global decrease in freshwater using observations from the Gravity Recovery and Climate Experiment (GRACE) satellites, operated by the German Aerospace Center, German Research Centre for Geosciences, and NASA. GRACE satellites measure fluctuations in Earth’s gravity on monthly scales that reveal changes in the mass of water on and under the ground. The original GRACE satellites flew from March 2002 to October 2017. The successor GRACE–Follow On (GRACE–FO) satellites launched in May 2018.
This map shows the years that terrestrial water storage hit a 22-year minimum (i.e., the land was driest) at each location, based on data from the GRACE and GRACE/FO satellites. A significantly large portion of the global land surface reached this minimum in the nine years since 2015, which happen to be the nine warmest years in the modern temperature record. Image by NASA Earth Observatory/Wanmei Liang with data courtesy of Mary Michael O’Neill The decline in global freshwater reported in the study began with a massive drought in northern and central Brazil, and was followed shortly by a series of major droughts in Australasia, South America, North America, Europe, and Africa. Warmer ocean temperatures in the tropical Pacific from late 2014 into 2016, culminating in one of the most significant El Niño events since 1950, led to shifts in atmospheric jet streams that altered weather and rainfall patterns around the world. However, even after El Niño subsided, global freshwater failed to rebound. In fact, Rodell and team report that 13 of the world’s 30 most intense droughts observed by GRACE occurred since January 2015. Rodell and colleagues suspect that global warming might be contributing to the enduring freshwater depletion.
Global warming leads the atmosphere to hold more water vapor, which results in more extreme precipitation, said NASA Goddard meteorologist Michael Bosilovich. While total annual rain and snowfall levels may not change dramatically, long periods between intense precipitation events allow the soil to dry and become more compact. That decreases the amount of water the ground can absorb when it does rain.
“The problem when you have extreme precipitation,” Bosilovich said, “is the water ends up running off,” instead of soaking in and replenishing groundwater stores. Globally, freshwater levels have stayed consistently low since the 2014-2016 El Niño, while more water remains trapped in the atmosphere as water vapor. “Warming temperatures increase both the evaporation of water from the surface to the atmosphere, and the water-holding capacity of the atmosphere, increasing the frequency and intensity of drought conditions,” he noted.
While there are reasons to suspect that the abrupt drop in freshwater is largely due to global warming, it can be difficult to definitively link the two, said Susanna Werth, a hydrologist and remote sensing scientist at Virginia Tech, who was not affiliated with the study. “There are uncertainties in climate predictions,” Werth said. “Measurements and models always come with errors.”
It remains to be seen whether global freshwater will rebound to pre-2015 values, hold steady, or resume its decline. Considering that the nine warmest years in the modern temperature record coincided with the abrupt freshwater decline, Rodell said, “We don’t think this is a coincidence, and it could be a harbinger of what’s to come.”
By James R. Riordon
NASA’s Earth Science News Team
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Last Updated Nov 15, 2024 Editor James Riordon Contact James Riordon james.r.riordon@nasa.gov Location NASA Goddard Space Flight Center Related Terms
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4 min read NASA Satellites Find Snow Didn’t Offset Southwest US Groundwater Loss
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How Earth’s Surface and Interior are Connected to Freshwater Availability
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By NASA
NASA The Apollo 12 spacecraft launches from NASA’s Kennedy Space Center in Florida in this image from Nov. 14, 1969, with astronauts Charles Conrad Jr., Richard F. Gordon Jr., and Alan L. Bean aboard. During liftoff, the Saturn V rocket which carried the Apollo capsule was struck twice by lightning.
On Nov. 19, 1969, the lunar module landed on the Moon. About three hours after landing, Conrad emerged from the lunar module, becoming the third person to step on the Moon. He was followed by Bean.
Image credit: NASA
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By NASA
Twelve-year-old, Aadya Karthik of Seattle, Washington; nine-year-old, Rainie Lin of Lexington, Kentucky; and eighteen-year-old, Thomas Lui, winners of the 2023-2024 Power to Explore Student Writing Challenge observe testing at a NASA Glenn cleanroom during their prize trip to Cleveland. Credit: NASA NASA’s fourth annual Power to Explore Student Challenge kicked off November 7, 2024. The science, engineering, technology, and mathematics (STEM) writing challenge invites kindergarten through 12th grade students in the United States to learn about radioisotope power systems, a type of nuclear battery integral to many of NASA’s far-reaching space missions.
Students are invited to write an essay about a new nuclear-powered mission to any moon in the solar system they choose. Submissions are due Jan. 31, 2025.
With freezing temperatures, long nights, and deep craters that never see sunlight on many of these moons, including our own, missions to them could use a special kind of power: radioisotope power systems. These power systems have helped NASA explore the harshest, darkest, and dustiest parts of our solar system and enabled spacecraft to study its many moons.
“Sending spacecraft into space is hard, and it’s even harder sending them to the extreme environments surrounding the diverse moons in our solar system,” said Nicola Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “NASA’s Power to Explore Student Challenge provides the incredible opportunity for our next generation – our future explorers – to design their own daring missions using science, technology, engineering, and mathematics to explore space and discover new science for the benefit of all, while also revealing incredible creative power within themselves. We cannot wait to see what the students dream up!”
Entries should detail where students would go, what they would explore, and how they would use radioisotope power systems to achieve mission success in a dusty, dark, or far away moon destination.
Judges will review entries in three grade-level categories: K-4, 5-8, and 9-12. Student entries are limited to 275 words and should address the mission destination, mission goals, and describe one of the student’s unique powers that will help the mission.
One grand prize winner from each grade category will receive a trip for two to NASA’s Glenn Research Center in Cleveland to learn about the people and technologies that enable NASA missions. Every student who submits an entry will receive a digital certificate and an invitation to a virtual event with NASA experts where they’ll learn about what powers the NASA workforce to dream big and explore.
Judges Needed
NASA and Future Engineers are seeking volunteers to help judge the thousands of contest entries anticipated submitted from around the country. Interested U.S. residents older than 18 can offer to volunteer approximately three hours to review submissions should register to judge at the Future Engineers website.
The Power to Explore Student Challenge is funded by the NASA Science Mission Directorate’s Radioisotope Power Systems Program Office and managed and administered by Future Engineers under the direction of the NASA Tournament Lab, a part of the Prizes, Challenges, and Crowdsourcing Program in NASA’s Space Technology Mission Directorate.
To learn more about the challenge, visit:
https://www.nasa.gov/power-to-explore
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Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
Kristin Jansen
Glenn Research Center, Cleveland
216-296-2203
kristin.m.jansen@nasa.gov
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Last Updated Nov 07, 2024 LocationNASA Headquarters Related Terms
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By European Space Agency
Torrential rainfall causing deadly flash floods has hit southern and eastern Spain in regions including the Costa del Sol, where the city of Malaga is located, and Valencia in the east. As these areas struggle to cope with the aftermath, satellite technology has played a crucial role in assessing the damages of the affected areas.
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
In Punakha, Bhutan, Dr. Aparna Phalke (left) from SERVIR works with a translator to converse with a local chili farmer (center) about his experiences cultivating these fields for over 30 years– including agricultural management practices, market prices, and farming challenges Sarah Cox/SERVIR NASA and the Kingdom of Bhutan have been actively learning from each other and growing together since 2019. The seeds planted over those years have ripened into improved environmental conservation, community-based natural resource management, and new remote sensing tools.
Known for its governing philosophy of “gross national happiness,” and has a constitutional mandate to maintain at least 60% forest cover. The government’s goals include achieving nationwide food security by 2030.
Bhutan first approached the U.S. State Department to partner on science, technology, engineering, and mathematics (STEM) opportunities for the country, and NASA was invited to help lead these opportunities. In 2019, Bhutan’s King Jigme Khesar Namgyel Wangchuck visited NASA’s Ames Research Center in Silicon Valley, California, and was introduced to several NASA programs.
NASA’s Earth scientists and research staff from several complementary programs have helped support Bhutan’s goals by providing data resources and training to make satellite data more useful to communities and decision makers. Bhutan now uses NASA satellite data in its national land management decisions and plans to foster more geospatial jobs to help address environmental issues.
Supporting Bhutan’s Environmental Decision Makers
Bhutan’s National Land Commission offers tax breaks to farmers to support food security and economic resilience. However, finding and reaching eligible farmers on the ground can be expensive and time consuming, which means small farmers in remote areas can be missed.
A team from SERVIR – a joint NASA-U.S. Agency for International Development initiative – worked with Bhutanese experts to create decision-making tools like the Farm Action Toolkit (FAcT). The tool uses imagery from the NASA-U.S. Geological Survey Landsat satellites to identify and measure the country’s farmland. SERVIR researchers met with agricultural organizations – including Bhutan’s Ministry of Agriculture and Livestock, National Statistics Bureau, and National Center for Organic Agriculture – to adjust the tool for the country’s unique geography and farming practices. The Land Commission now uses FAcT to identify small farms and bring support to more of the country.
NASA also develops local capacity to use Earth data through efforts like the Applied Remote Sensing Training Program (ARSET). In early 2024, ARSET staff worked with SERVIR and Druk Holdings and Investments (DHI) to host a workshop with 46 Bhutanese government personnel. Using tailored local case studies, the teams worked to find ways to better manage natural resources, assist land use planning, and monitor disasters.
“We look forward to continuing this collaboration, as there are still many areas where NASA’s expertise can significantly impact Bhutan’s development goals,” said Manish Rai, an analyst with DHI who helped coordinate the workshop. “This collaboration is a two-way street. While Bhutan has benefited greatly from NASA’s support, we believe there are also unique insights and experiences that Bhutan can share with NASA, particularly in areas like environmental conservation and community-based natural resource management.”
Dr. Aparna Phalke gives a presentation on NASA technology and the SERVIR program to a group of 100 students at the Royal University of Bhutan College of Natural Resources. Sarah Cox/SERVIR Encouraging Bhutan’s Future Environmental Leaders
By working with students and educators from primary schools to the university level, Bhutan and NASA have been investing in the country’s future environmental leadership. Supporting educators and “training trainers” have been pillars of this collaboration.
NASA and Bhutan have worked together to boost the skills of early-career Earth scientists. For example, NASA’s DEVELOP program for undergraduates worked directly with local institutions to create several applied science internships for Bhutanese students studying in the U.S.
Tenzin Wangmo, a high school biology teacher in Bhutan, participated in DEVELOP projects focusing on agriculture and water resources. According to Wangmo, the lessons learned from those projects have been helpful in connecting with her students about STEM opportunities and environmental issues. “Most people only think of NASA as going to space, rather than Earth science,” she said. “It was encouraging to my students that there are lots of opportunities for you if you try.”
NASA is also supporting Bhutan’s future environmental leadership through the GLOBE (Global Learning and Observations to Benefit the Environment) Program. The GLOBE program is a U.S. interagency outreach program that works with teachers to support STEM literacy through hands-on environmental learning. Since 2020, GLOBE has worked through the U.S. State Department and organizations like the Ugyen Wangchuck Institute for Forest Research and Training to support educators at two dozen schools in Bhutan. The program reached more than 650 students with activities like estimating their school’s carbon footprint.
This focus on STEM education enables students and professionals to contribute to Bhutan’s specific development goals now and in the future.
Sonam Tshering, a student who completed two DEVELOP projects on Bhutanese agriculture while studying at the University of Texas at El Paso, was able to share the value of these efforts at the 2023 United Nations Climate Conference. “By applying satellite data from NASA, we aimed to create actionable insights for our local farmers and our policymakers back in Bhutan,” she said.
News Media Contact
Lane Figueroa
Marshall Space Flight Center, Huntsville, Ala.
256.544.0034
lane.e.figueroa@nasa.gov
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Last Updated Nov 04, 2024 Related Terms
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