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Antarctic glacier named Glasgow to mark COP26
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By NASA
Dr. Compton J. Tucker – a senior researcher at NASA’s Goddard Space Flight Center (GSFC) – joins 149 newly elected members to the National Academy of Sciences (NAS) – see Photo. NAS is one of the highest honors in American science. Compton gave a virtual presentation at GSFC on July 21, 2025, in which he showed highlights from his 50 years of research and reflected on the honor of being selected as an NAS fellow. He admitted that he was surprised upon learning of his election in April 2025 – despite his prestigious career.
Photo 1. Compton Tucker uses satellites to address global environmental challenges. Photo credit: Colorado State University In some ways this award brings Compton’s career full circle. He first came to GSFC as a NAS postdoc in 1975 after having earned his Bachelor’s of Science degree at Colorado State University (CSU) in 1969. He followed with his Master’s of Science degree and Ph.D. from CSU’s College of Forestry in 1973 and 1975 respectively. Two years later, he joined NASA as a civil servant. After a prestigious 48 years of public service, Compton has decided to retire in March 2025.
Compton is a well-known pioneer in the field of satellite-based environmental analysis, using data from various U.S. Geological Survey–NASA Landsat missions and from the National Oceanographic and Atmospheric Administration’s (NOAA) Advanced Very High Resolution Radiometer (AVHRR) instrument, the prototype of which launched aboard the Television Infrared Observation Satellite–N (TIROS-N) in 1978, with launches continuing on NOAA and European polar orbiting satellites throughout the next 40 years. The last two AVHRR instruments, which launched on the European Organisation for the Exploitation of Meteorological Satellites’ (EUMETSAT) Meteorological Operational satellites (METOP–B and -C) in 2012 and 2018 respectively, are still operational today.
Photo 2. Earth scientist Compton Tucker, who has studied remote sensing of vegetation at NASA Goddard for 50 years, has been elected to the National Academy of Sciences. Photo credit: Compton Tucker In his GSFC presentation, Compton described how, in the course of doing their research, he and his colleague(s) realized the original plans for AVHRR resulted in Channel 1 and 2 overlapping one another. In short, he explained that his input helped persuade NOAA management to change the design for Channel 1 of AVHRR – beginning with NOAA-7. It is fair to say that this change had a lasting impact, with 16 more AVHRR instruments (with slight modifications over time) launched over the next four decades.
Compton’s research has focused on global photosynthesis on land (e.g., grass-dominated savannas), determined land cover (i.e., forest fragmentation, deforestation, and forest condition), monitored droughts and food security, and evaluated ecologically coupled disease outbreaks. From 2005 to 2010, he was the co-chair of two Interagency Working Groups for Observations and Land Use and Land Cover Change. Compton was active in NASA’s Space Archaeology Program, participating in ground-based radar and magnetic surveys in Turkey, particularly at Troy, the Granicus River Valley, and Gordion. Over the course of his 50-year career, he has authored or co-authored more than 400 scholarly articles that have appeared in scientific journals – and in his presentation he hinted that more might be in store after retirement.
Compton has received numerous scientific awards and honors. He was elected to a fellow of the American Geophysical Union in 2009 and to the American Association for the Advancement of Science in 2015. He received the Senior Executive Service Presidential Rank Award for Meritorious Service (2017), the Vega Medal from the Swedish Society of Anthropology and Geography (2014), the Galathea Medal from the Royal Danish Geographical Society (2004), the William T. Pecora Award from the U.S. Geological Survey (1997), the Michael Collins Trophy for Current Achievement from the National Air and Space Museum (1993), the Henry Shaw Medal from the Missouri Botanical Garden (1992), and the Exceptional Scientific Achievement Medal from NASA (1987).
Compton enjoyed sharing his knowledge with the next generation of scientists. He served as an adjunct professor at the University of Maryland (1994–2024) and a consulting scholar at the University of Pennsylvania Museum of Archeology and Anthropology (2005–2024).
Congratulations to Compton on earning this prestigious – and well-earned – recognition from NAS. Best wishes to him in whatever is next on his journey.
The National Academy of Sciences is a private, nonprofit institution that was established under a congressional charter signed by President Abraham Lincoln in 1863. It recognizes achievement in science by election to membership, and – with the National Academy of Engineering and the National Academy of Medicine – provides science, engineering, and health policy advice to the federal government and other organizations.
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By European Space Agency
Combining 25 years of space-based data with ocean sampling, scientists have uncovered a change in the microscopic organisms that underpin the Southern Ocean’s food chain and carbon storage.
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Ocean currents swirl around North America (center left) and Greenland (upper right) in this data visualization created using NASA’s ECCO model. Advanced computing is helping oceanographers decipher hot spots of phytoplankton growth.NASA’s Scientific Visualization Studio As Greenland’s ice retreats, it’s fueling tiny ocean organisms. To test why, scientists turned to a computer model out of JPL and MIT that’s been called a laboratory in itself.
Runoff from Greenland’s ice sheet is kicking nutrients up from the ocean depths and boosting phytoplankton growth, a new NASA-supported study has found. Reporting in Nature Communications: Earth & Environment, the scientists used state-of-the art-computing to simulate marine life and physics colliding in one turbulent fjord. Oceanographers are keen to understand what drives the tiny plantlike organisms, which take up carbon dioxide and power the world’s fisheries.
Greenland’s mile-thick ice sheet is shedding some 293 billion tons (266 billion metric tons) of ice per year. During peak summer melt, more than 300,000 gallons (1,200 cubic meters) of fresh water drain into the sea every second from beneath Jakobshavn Glacier, also known as Sermeq Kujalleq,the most active glacier on the ice sheet. The waters meet and tumble hundreds of feet below the surface.
Teal-colored phytoplankton bloom off the Greenland coast in this satellite image captured in June 2024 by NASA’s PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) mission.NASA The meltwater plume is fresh and more buoyant than the surrounding saltwater. As it rises, scientists have hypothesized, it may be delivering nutrients like iron and nitrate — a key ingredient in fertilizer — to phytoplankton floating at the surface.
Researchers track these microscopic organisms because, though smaller by far than a pinhead, they’re titans of the ocean food web. Inhabiting every ocean from the tropics to the polar regions, they nourish krill and other grazers that, in turn, support larger animals, including fish and whales.
Previous work using NASA satellite data found that the rate of phytoplankton growth in Arctic waters surged 57% between 1998 and 2018 alone. An infusion of nitrate from the depths would be especially pivotal to Greenland’s phytoplankton in summer, after most nutrients been consumed by prior spring blooms. But the hypothesis has been hard to test along the coast, where the remote terrain and icebergs as big as city blocks complicate long-term observations.
“We were faced with this classic problem of trying to understand a system that is so remote and buried beneath ice,” said Dustin Carroll, an oceanographer at San José State University who is also affiliated with NASA’s Jet Propulsion Laboratory in Southern California. “We needed a gem of a computer model to help.”
Sea of Data
To re-create what was happening in the waters around Greenland’s most active glacier, the team harnessed a model of the ocean developed at JPL and the Massachusetts Institute of Technology in Cambridge. The model ingests nearly all available ocean measurements collected by sea- and satellite-based instruments over the past three decades. That amounts to billions of data points, from water temperature and salinity to pressure at the seafloor. The model is called Estimating the Circulation and Climate of the Ocean-Darwin (ECCO-Darwin for short).
Simulating “biology, chemistry, and physics coming together” in even one pocket along Greenland’s 27,000 miles (43,000 kilometers) of coastline is a massive math problem, noted lead author Michael Wood, a computational oceanographer at San José State University. To break it down, he said the team built a “model within a model within a model” to zoom in on the details of the fjord at the foot of the glacier.
Using supercomputers at NASA’s Ames Research Center in Silicon Valley, they calculated that deepwater nutrients buoyed upward by glacial runoff would be sufficient to boost summertime phytoplankton growth by 15 to 40% in the study area.
More Changes in Store
Could increased phytoplankton be a boon for Greenland’s marine animals and fisheries? Carroll said that untangling impacts to the ecosystem will take time. Melt on the Greenland ice sheet is projected to accelerate in coming decades, affecting everything from sea level and land vegetation to the saltiness of coastal waters.
“We reconstructed what’s happening in one key system, but there’s more than 250 such glaciers around Greenland,” Carroll said. He noted that the team plans to extend their simulations to the whole Greenland coast and beyond.
Some changes appear to be impacting the carbon cycle both positively and negatively: The team calculated how runoff from the glacier alters the temperature and chemistry of seawater in the fjord, making it less able to dissolve carbon dioxide. That loss is canceled out, however, by the bigger blooms of phytoplankton taking up more carbon dioxide from the air as they photosynthesize.
Wood added: “We didn’t build these tools for one specific application. Our approach is applicable to any region, from the Texas Gulf to Alaska. Like a Swiss Army knife, we can apply it to lots of different scenarios.”
News Media Contacts
Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov
Written by Sally Younger
2025-101
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Last Updated Aug 06, 2025 Related Terms
Earth Carbon Cycle Earth Science Ice & Glaciers Jet Propulsion Laboratory Oceans PACE (Plankton, Aerosol, Cloud, Ocean Ecosystem) Water on Earth Explore More
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By NASA
Before astronauts venture around the Moon on Artemis II, the agency’s first crewed mission to the Moon since Apollo, Mark Cavanaugh is helping make sure the Orion spacecraft is safe and space-ready for the journey ahead.
As an Orion integration lead at NASA’s Johnson Space Center in Houston, he ensures the spacecraft’s critical systems— in both the U.S.-built crew module and European-built service module—come together safely and seamlessly.
Mark Cavanaugh stands in front of a mockup of the Orion spacecraft inside the Space Vehicle Mockup Facility at NASA’s Johnson Space Center in Houston.NASA/Robert Markowitz With nearly a decade of experience at NASA, Cavanaugh currently works within the Orion Crew and Service Module Office at Johnson. He oversees the technical integration of the European Service Module, which provides power, propulsion, and life support to Orion during Artemis missions to the Moon. His work includes aligning and verifying essential systems to keeping the crew alive, including oxygen, nitrogen, water storage, temperature regulation, and spacecraft structures.
In addition to his integration work, Cavanaugh is an Orion Mission Evaluation Room (MER) manager. The MER is the engineering nerve center during Artemis flights, responsible for real-time monitoring of the Orion spacecraft and real-time decision-making. From prelaunch to splashdown, Cavanaugh will lead a team of engineers who track vehicle health and status, troubleshoot anomalies, and communicate directly with the flight director to ensure the mission remains safe and on track.
Mark Cavanaugh supports an Artemis I launch attempt from the Passive Thermal Control System console on Aug. 29, 2022, in the Orion Mission Evaluation Room at NASA’s Johnson Space Center.NASA/Josh Valcarcel Cavanaugh’s passion for space exploration began early. “I’ve wanted to be an aerospace engineer since I was six years old,” he said. “My uncle, who is also an aerospace engineer, used to take me to wind tunnel tests and flight museums as a kid.”
That passion only deepened after a fifth-grade trip from Philadelphia to Houston with his grandfather. “My dream of working at NASA Johnson started when I visited the center for the first time,” he said. “Going from being a fifth grader riding the tram on the tour to contributing to the great work done at Johnson has been truly incredible.”
Turning that childhood dream into reality did not come with a straight path. Cavanaugh graduated from Pennsylvania State University in 2011, the same year NASA’s Space Shuttle Program ended. With jobs in the space industry in short supply, he took a position with Boeing in Houston, working on the International Space Station’s Passive Thermal Control System. He later supported thermal teams for the Artemis Moon rocket called the Space Launch System, and the Starliner spacecraft that flew astronauts Butch Wilmore and Suni Williams during their Boeing Crew Flight Test mission, before a mentor flagged a NASA job posting that turned out to be the perfect fit.
He joined NASA as the deputy system manager for Orion’s Passive Thermal Control System, eventually stepping into his current leadership role on the broader Orion integration team. “I’ve been very lucky to work with some of the best and most supportive teammates you can imagine,” he said.
Mark Cavanaugh with his mother, Jennifer, in front of the Artemis I Orion spacecraft following the thermal vacuum test at the Space Environments Complex at NASA’s Neil Armstrong Test Facility in Sandusky, Ohio. Cavanaugh says collaboration and empathy were key to solving challenges along the way. “I’ve learned to look at things from the other person’s perspective,” he said. “We’re all working toward the same incredible goal, even if we don’t always agree. That mindset helps keep things constructive and prevents misunderstandings.”
He also emphasizes the importance of creative problem-solving. “For me, overcoming technical challenges comes down to seeking different perspectives, questioning assumptions, and not being afraid to try something new—even if it sounds a little ridiculous at first.”
Mark Cavanaugh riding his motorcycle on the Circuit of the Americas track in Austin, Texas. Outside of work, Cavanaugh fuels his love of speed and precision by riding one of his three motorcycles. He has even taken laps at the Circuit of the Americas track in Austin, Texas.
When he is not on the track or in the control room, Cavanaugh gives back through student outreach. “The thing I always stress when I talk to students is that nothing is impossible,” he said. “I never thought I’d get to work in the space industry, let alone at NASA. But I stayed open to opportunities—even the ones that didn’t match what I originally imagined for myself.”
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By European Space Agency
Using data from ESA’s SMOS satellite, scientists have revealed a surprising shift in the Southern Ocean – surface waters around Antarctica are growing saltier, even as sea ice is diminishing rapidly. This finding defies the norm because melting ice typically freshens ocean surface water.
The implications are far-reaching as changes in this remote region can disrupt global ocean currents, affect climate patterns, and alter ecosystems far beyond the Antarctic.
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