Illustration of NASA’s Ice, Cloud and land Elevation Satellite tv for computer-2 (ICESat-2), a mission to measure the changing height of Earth’s ice. Credit: NASA
Soften Ponds, Summer Ice, and Extra: Space Laser Measures Changing Earth
Since 2003, Arctic sea ice has misplaced about a third of its volume. On the reverse facet of the arena, at the varied pole, new glacial lakes were learned deep below the bottom of Antarctic ice. And at latitudes in between, changing water ranges in reservoirs printed human influences.
Those are appropriate about a of the 100-plus new discoveries made with accurate height files from the 12 trillion laser measurements peaceable from
Since its beginning in September 2018, ICESat-2 has gathered files and inspired learn on our changing Earth – ranging from ice to tropical beaches and boreal forests to metropolis areas. Sooner than beginning, mission science group individuals talked about what they hoped it will maybe most likely assist us impress. After successfully polishing off its three-Twelve months main mission, the mission now has the inexperienced light to continue operations, and these ice experts share what it has learned.
ICESat-2 measurements present a terrific level of precision as it measures Earth’s ground, including the Antarctic ice sheet viewed here. Credit: NASA’s Goddard Space Flight Center / Kate Ramsayer
Ice and Beyond
Alex Gardner, NASA’s Jet Propulsion Laboratory in Southern California
“I’m truly amazed at the engineering of ICESat-2. We’re counting particular particular person photons bouncing off the bottom of Earth – with remarkable precision. And the science that is flowing from it is remarkable. Honest away, we saw changes in the Antarctic and Greenland ice sheets, the influence of the ocean eating away at the ice and melting the bottom in Greenland.
“But what has additionally truly stood out is the variety of scientific fields the usage of ICESat-2. It spans ocean science, hydrology, the cryosphere, the biosphere – I knew there’ll be loads of the way of the usage of the guidelines, but I don’t judge I anticipated how speedily that could happen. I’m having a watch forward to the tsunami of experiences coming.”
A glacier on the Antarctic Peninsula flows into the Bellingshausen Sea, as viewed from a flight of the Operation IceBridge airborne mission, extinct to calibrate and validate ICESat-2 files. Credit: NASA / Kate Ramsayer
Soften in Antarctica
Brooke Medley, NASA’s Goddard Space Flight Center in Greenbelt, Maryland
“I judge one amongst the coolest issues we’ve viewed is melt ponds in Antarctica. It gets your brain jogging – if we could automatically detect particular particular person ponds and measure their depth, it will maybe most likely expose us about the liquid water storage at the bottom of the ice sheet, which is one amongst the most spicy issues to estimate at that natty a scale.
“That’s a gleaming thing about ICESat-2 – the scales at which that that you just have to more than doubtless gape processes ranges from very little, esteem snow blowing around, the whole reach up to the whole ice sheet.”
Summertime Ice
Nathan Kurtz, NASA Goddard
“Within the previous couple of decades, Arctic sea ice that extinct to closing thru the summers hasn’t been surviving. And ICESat-2 works surprisingly well in summers, given the clouds and melt ponds. So we can discover the thickness of sea ice into the melt season, and resolve out what’s inflicting the melt more definitively.
“Quite loads of of us are fascinated with sea ice predictions, and whether or no longer over a summer time the Arctic will be truly free of sea ice. ICESat-2 helps us reveal with self belief what’s going down.”
Accuracy & Precision from the Bag-inch
Kelly Brunt, NASA Goddard and the Nationwide Science Basis
“ICESat-2 used to be accurate and appropriate appropriate out of the gate. Coupled with that, it has very unprejudiced appropriate pointing files and pointing adjust, meaning we scheme to hit a plight and we hit it.
“So as soon as we repeat orbits to measure how issues change over time, we can gain a closer sense of issues esteem the grounding zone of ice cupboards, the attach the ice meets the ocean. We are in a position to larger measure the attach those are, and additionally take a look at the impact of tides on the floating ice.”
A gap in the ocean ice cowl north of Greenland is partially stuffed in by powerful smaller sea ice rubble and floes, as viewed in the future of an Operation IceBridge flight in September 2019. Credit: NASA/Linette Boisvert
Snow on Ice on Water
Ron Kwok,
Frozen flood ponds on the ocean ice, as viewed in the future of an Operation IceBridge flight in March 2017. Credit: NASA/Jeremy Harbeck
“It’s offering us with files about melt ponds on sea ice, which will be roughly the sizes of Olympic swimming pools – and ICESat-2 can measure their depth from house. Right here’s broad attributable to it enables us to admire how multiyear ice is melting out in summer time. We must gape melt ponds to admire how weak the ice is to additional loss.”
“ICESat-2 has gone beyond what it used to be designed for. I’m having a watch forward to extending the time sequence to gain month-to-month files of polar regions over time – something we haven’t had.
“As we gain into 5, six, seven years of files, we can in fact take a look at native climate indicators beyond what is attributable to climate. Then it becomes truly attention-grabbing, and we can larger impress how native climate is impacting the poles.”