Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 32, Issue 24, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL024122
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The possible role of sea-ice feedbacks in the climatic response to orbital forcing at high northern latitudes is studied with a coupled climate model (ECBilt-CLIO). It is found that boreal summer insolation is critical for the sea-ice response. When summer insolation is high (low) the sea-ice fraction decreases (increases) at the margins of the permanent sea-ice cover during the whole year. More importantly, rapid shifts in GIN (Greenland-Iceland-Norway) Sea ice cover are found to be less (more) frequent for relatively high (low) summer insolation. These events, which are characterized by a sudden expansion in sea-ice cover, result in reduced GIN Sea convection, a reduction of the Atlantic thermohaline circulation by 5-10 Sverdrups and decreased air temperatures at high latitudes.
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