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Humans Now Control The Majority of All Surface Freshwater Fluctuations on Earth

Humans Now Control The Majority of All Surface Freshwater Fluctuations on Earth
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NASA scientists complete 1st global survey of freshwater fluctuation

Credit: National Park Service To investigate humans impact on freshwater resources, scientists have now conducted the first global accounting of fluctuating water levels in Earth s lakes and reservoirs - including ones previously too small to measure from space. The research, published March 3 in the journal Nature, relied on NASA s Ice, Cloud and land Elevation Satellite 2 (ICESat-2), launched in September 2018. ICESat-2 sends 10,000 laser light pulses every second down to Earth. When reflected back to the satellite, those pulses deliver high-precision surface height measurements every 28 inches (70 centimeters) along the satellite s orbit. With these trillions of data points, scientists can distinguish more features of Earth s surface, like small lakes and ponds, and track them over time.

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NASA finds what a glacier s slope reveals about Greenland Ice Sheet thinning

E-Mail IMAGE: GIF showing the potential distances over which thinning can spread into Greenland s interior. Glaciers in regions of higher elevation, tend to pervade less inland than those in regions of lower. view more Credit: Credits: Denis Felikson As glaciers flow outward from the Greenland Ice Sheet, what lies beneath them offers clues to their role in future ice thinning and sea-level rise contribution. Outlet glaciers are rivers of ice flowing within the cracks of the bedrock and draining into the surrounding sea. They retreat and start to thin as climate warms, and this thinning works its way toward the center of the ice sheet. Now, by looking at the bed topography beneath the ice, scientists have a better understanding of which glaciers could have a significant impact on the Greenland Ice Sheet s contribution to sea-level rise in coming years. They found that some glaciers flowing over gentler slopes could have a greater impact than previously thought. The

United statesGoddard space flight centerDenis feliksonGeophysical research lettersUniversity of texasUniversities space research associationGreenland ice sheetSpace flight centerGreenland ice mapping projectSpaceborne thermal emissionReflection radiometerElevation satelliteOperation icebridgeஒன்றுபட்டது மாநிலங்களில்கோடார்ட் இடம் விமானம் மையம்புவி இயற்பியல் ஆராய்ச்சி எழுத்துக்கள்

Beyond Ice: NASA s ICESat-2 Shows Hidden Talents – Climate Change: Vital Signs of the Planet

Credit: NASA s Goddard Space Flight Center Before its September 2018 launch, the ICESat-2 mission team was focused on making sure the satellite met its science requirements, said Tom Neumann, the mission’s project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. And it has, by precisely measuring the height of the ice sheets at Earth’s poles, of sea ice floes above the ocean waters, and of forest canopies. The satellite’s continuous coverage around the globe, with height measurements of Earth’s surface taken every 2.3 feet (70 centimeters) along its ground path, has made ICESat-2 datasets appealing to those studying rivers, coastal regions, forests and more, he said.

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