Last year saw record low levels of sea ice — and this year looks set to be even worse, scientists say
Sea ice levels around Antarctica just registered a record low — and by a wide margin — as winter comes to a close, according to the National Snow and Ice Data Center (
NSIDC). This significant milestone adds worry that Antarctic sea ice may be entering a state of decline brought on by climate change.
This February, scientists reported Antarctic floating sea ice hit
an all-time low at the end of the summer — and sea ice growth continued to remain slow through winter.
This year, Antarctica reached its annual maximum coverage on Sept. 10, about 13 days earlier than average.
Less sea ice means less sunlight will be reflected back to space, causing waters to warm more and destabilize surrounding ice and glaciers. Coastlines are also much more exposed with less sea ice, removing a buffer that could help protect melting ice shelves or ice sheets. [i.e. there's a positive feedback loop (but with negative results)]
Warmer ocean temperatures around the continent have caused major ice melt around the ice sheet, including
destabilizing the Thwaites Glacier, which is about the size of Florida and contributes to 4 percent of annual global sea level rise.
“Polar ice is one of the world’s biggest insurance policies against runaway climate change, and we can see in both the North and the South sea ice, we’ve got problems and alarm bells are ringing.”
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study published on Sept. 13 said these records indicate that “the underlying processes controlling Antarctic sea ice coverage may have altered.”