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首页> 外文期刊>Geophysical Research Letters >Evolution of Arctic sea ice concentration trends and the role of atmospheric circulation forcing, 1979-2007
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Evolution of Arctic sea ice concentration trends and the role of atmospheric circulation forcing, 1979-2007

机译：1979-2007年北极海冰浓度趋势演变和大气环流强迫作用

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摘要

The retreat of Arctic sea ice in recent decades is a pre-eminent signal of climate change. What role has the atmospheric circulation played in driving the sea ice decline? To address this question, we document the evolution of Arctic sea ice concentration trends during the period January 1979-April 2007 in light of changing atmospheric circulation conditions, in particular an upward trend in the wintertime Northern Annular Mode during the first half of the record and a downward trend during the second half. The results indicate that concurrent atmospheric circulation trends contribute to forcing winter and summer sea ice concentration trends in many parts of the marginal ice zone during both periods. However, there is also an emerging signal of overall Arctic sea ice decline since 1979 in both winter and summer that is not directly attributable to a trend in the overlying atmospheric circulation.
机译：近几十年来，北极海冰的退缩是气候变化的重要信号。大气环流在推动海冰下降中起了什么作用？为了解决这个问题，我们记录了1979年1月至2007年4月期间北极海冰浓度趋势的变化，该变化是由于大气环流条件的变化，特别是记录上半年冬季北极环空模式的上升趋势和下半年下降趋势。结果表明，在两个时期内，大气环流的同时发展趋势促使边缘和边缘冰区许多地区的冬季和夏季海冰浓度趋势趋于强迫。但是，自1979年以来，冬季和夏季也出现了北极海冰总体下降的信号，这并不直接归因于大气环流的趋势。

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