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Author Topic: 🚩 Global Climate Chaos ☠️  (Read 35080 times)

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AGelbert

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Re: 🚩 Global Climate Chaos ☠️
« Reply #1605 on: January 07, 2019, 02:20:37 pm »
An enormous waterfall gushes off the Nansen Ice Shelf in 2017. Credit: Jonathan Kingslake

January 4, 2019

Antarctic ice melts to January record low

The amount of sea ice around Antarctica has melted to a record low for January, scientists announced this week.

As of Jan. 1, there was 2.11 million square miles of sea ice around the continent, the smallest January area since records began in 1978, according to the National Snow and Ice Data Center.

Sea ice is frozen ocean water that melts each summer, then refreezes each winter. Antarctic sea ice is typically at its smallest in late February or early March, toward the end of summer in the Southern Hemisphere.

“Antarctic sea ice extent is astonishingly low this year, not just near the Ross Ice Shelf, but around most of the continent,” Cecilia Bitz, a polar scientist at the University of Washington, told Grist magazine on Thursday.

Specifically, the area of sea ice around Antarctica on Jan. 1 was 11,600 square miles below the previous record low for that date, set in 2017. It was 726,000 square miles below average – an area roughly twice the size of the state of Texas.

With six to eight weeks remaining in the melt season, the ice center said it remains to be seen whether the Antarctic sea ice will set its all-time record-low minimum.

More: Ancient Antarctic ice sheet collapse could happen again, triggering a new global flood

More: Greenland's ice sheet melt has 'gone into overdrive' and is now 'off the charts'

Sea ice loss – especially in the Arctic and less so in the Antarctic – is one of the clearest signals of global warming, the National Climate Assessment reported last year.

In addition to human-caused warming of the Earth's atmosphere and oceans, multiple factors – including the geography of Antarctica, the region's winds, as well as air and ocean temperatures – affect the ice around Antarctica.

"Although it is too soon for us to isolate what caused the rapid December decline and recent record low extents, it is likely that unusual atmospheric conditions and high sea surface temperatures – important factors in the 2016-2017 record lows – are playing a role," according to a statement from the National Snow and Ice Data Center.

The center added that even though sea ice occurs primarily in the polar regions, it influences our global climate and weather patterns around the world.

https://www.usatoday.com/story/news/world/2019/01/04/antarctic-sea-ice-melts-record-low-january-scientists/2481706002/

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