9:29:45 
2022-03-19 
298
In the past 20 years, the Arctic has lost about one-third of its winter sea ice volume, according to a new study by researchers at the University of Washington and the California Institute of Technology. That decline is largely due to loss of older, multiyear sea ice. New satellite data also show that wintertime Arctic sea ice is likely thinner than previous estimates.
The study. was published March 10 in Geophysical Research Letters.
“The key takeaway, for me, is the remarkable loss of Arctic winter sea ice volume — one-third of the winter ice volume lost over just 18 years — that accompanied a widely reported loss of old, thick Arctic sea ice, and decline in end-of-summer ice extent,” said co-author Ron Kwok, a polar scientist at the UW Applied Physics Laboratory.
Seasonal sea ice, which melts completely each summer rather than accumulating over years, is replacing thicker, multiyear ice. This switch is largely responsible for the sea ice thinning, according to the new research.
“Arctic snow depth, sea ice thickness and volume are three very challenging measurements to obtain,” Kwok remarked.
The newest technology, a combination of ICESat-2 lidar data and CryoSat-2 radar data, is able for the first time to estimate the depth of the snow on top of the Arctic sea ice. Using snow depth and the height of sea ice exposed above water, the study found that multiyear Arctic sea ice lost 16% of its winter volume, or approximately half a meter (about 1.5 feet) of thickness, in the three years since the launch of ICESat-2 in 2018.
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