Contribution of sea ice loss to Arctic amplification

Details Contribution of sea ice loss to Arctic amplification Contribution of sea ice loss to Arctic amplification

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3721701k&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 21, CiteID L21701

Mathematics

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4

Global Change: Cryospheric Change (0776), Global Change: Global Climate Models (3337, 4928), Hydrology: Snow And Ice (0736, 0738, 0776, 1827)

Scientific paper

Atmospheric climate models are subjected to the observed sea ice conditions during 2007 to estimate the regionality, seasonality, and vertical pattern of temperature responses to recent Arctic sea ice loss. It is shown that anomalous sea ice conditions accounted for virtually all of the estimated Arctic amplification in surface-based warming over the Arctic Ocean, and furthermore they accounted for a large fraction of Arctic amplification occurring over the high-latitude land between 60°N and the Arctic Ocean. Sea ice loss did not appreciably contribute to observed 2007 land temperature warmth equatorward of 60°N. Likewise, the observed warming of the free atmosphere attributable to sea ice loss is confined to Arctic latitudes, and is vertically confined to the lowest 1000 m. The results further highlight a strong seasonality of the temperature response to the 2007 sea ice loss. A weak signal of Arctic amplification in surface based warming is found during boreal summer, whereas a dramatically stronger signal is shown to develop during early autumn that persisted through December even as sea ice coverage approached its climatological values in response to the polar night.

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