Discover and read the best of Twitter Threads about #icesat2
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We know that as human activity warms the planet, global sea level is rising. We know that about 2/3 of sea level rise so far has come from melting ice. But how do we know this? We can measure it from space.
#SeeingTheSeas
#SeeingTheSeas
Sea level isn’t uniform around the planet. Tides and currents, the density and temperature of water, and landforms can affect where the ocean piles up. We know this because we measure the shape of the ocean using radar altimetry.
go.nasa.gov/3n0EpGB
go.nasa.gov/3n0EpGB
Altimetry works by bouncing radio waves off the ocean surface and timing how quickly they return. Then comes the next challenge: Calculating the natural and seasonal changes in ocean height to determine how much more global warming has made seas rise.
318 gigatons.
That’s how much ice is lost every year from Antarctica and Greenland’s ice sheets, according to new science from @NASA_Ice's #ICESat2. go.nasa.gov/3cb0bCC
But… how much ice is that, really? 🤔
That’s how much ice is lost every year from Antarctica and Greenland’s ice sheets, according to new science from @NASA_Ice's #ICESat2. go.nasa.gov/3cb0bCC
But… how much ice is that, really? 🤔
Let's say 🧊= a gigaton of ice.
🧊 would be enough to cover NYC’s Central Park in ice past the top of the Chrysler Building. When melted, it would fill 400,000 Olympic-sized swimming pools.
Each year from 2003 to 2019, Greenland lost 200 🧊s. Antarctica lost 118 🧊s.
🧊 would be enough to cover NYC’s Central Park in ice past the top of the Chrysler Building. When melted, it would fill 400,000 Olympic-sized swimming pools.
Each year from 2003 to 2019, Greenland lost 200 🧊s. Antarctica lost 118 🧊s.
From 2003-2019, Greenland lost: 🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊🧊
