Pacific Ocean inflow : influence on catastrophic reduction of sea ice cover in the Arctic Ocean

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Date
2006-04-21
Authors
Shimada, Koji
Kamoshida, Takashi
Itoh, Motoyo
Nishino, Shigeto
Carmack, Eddy C.
McLaughlin, Fiona A.
Zimmermann, Sarah
Proshutinsky, Andrey
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10.1029/2005GL025624
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Abstract
The spatial pattern of recent ice reduction in the Arctic Ocean is similar to the distribution of warm Pacific Summer Water (PSW) that interflows the upper portion of halocline in the southern Canada Basin. Increases in PSW temperature in the basin are also well-correlated with the onset of sea-ice reduction that began in the late 1990s. However, increases in PSW temperature in the basin do not correlate with the temperature of upstream source water in the northeastern Bering Sea, suggesting that there is another mechanism which controls these concurrent changes in ice cover and upper ocean temperature. We propose a feedback mechanism whereby the delayed sea-ice formation in early winter, which began in 1997/1998, reduced internal ice stresses and thus allowed a more efficient coupling of anticyclonic wind forcing to the upper ocean. This, in turn, increased the flux of warm PSW into the basin and caused the catastrophic changes.
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Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 33 (2006): L08605, doi:10.1029/2005GL025624.
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Geophysical Research Letters 33 (2006): L08605
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