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The Greenland Thread

Re: The Greenland Thread

Unread postby Newfie » Tue 12 Mar 2019, 18:55:45

And I just point out it may have been a local condition not overall climate change.

Let’s just drop it, I’m totally confused at what you were driving at.
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Re: The Greenland Thread

Unread postby jawagord » Tue 12 Mar 2019, 19:12:10

Interesting study linking D-O events to Norwegian Sea ice. Basically the abrupt warming event is due to reduction in Norwegian Sea ice cover, not Arctic sea ice or Antarctica.

Greenland ice core records reveal that the last glacial period was marked by abrupt climate changes, leading to alternating cold Greenland stadials (GS) and warmer Greenland interstadials (GI), known as Dansgaard-Oeschger (D-O) cycles (1, 2). These D-O climate fluctuations involved dramatic changes in northern high-latitude air temperature, hydroclimate, and atmospheric circulation transitioning in a matter of decades (2–4), and also affected Eurasian (5) and tropical climates (6).

We conclude that the glacial sea ice variability in the Norwegian Sea acted as an important factor that contributed to abrupt glacial changes in ocean circulation and climate in the North Atlantic and over Greenland. We suggest that sea ice reduction and resumption of deep-water formation in the Nordic Seas may have played a persistent role in triggering the abrupt GS-GI climate transitions, terminating both “normal” stadials and “most extreme” stadials that were characterized by severe iceberg surges and collapse of deep-water formation in the North Atlantic and extreme AMOC breakdowns, as, for example, associated with Heinrich Event 4 during GS9 (8, 10). This corroborates previous hypotheses that relate the D-O warming events observed in Greenland ice cores to changes in Nordic Seas sea ice cover.

http://advances.sciencemag.org/content/5/3/eaau6174

http://advances.sciencemag.org/content/ ... .large.jpg
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