Is extreme Arctic sea ice anomaly in 2007 a key contributor to severe January 2008 snowstorm in China?

Is extreme Arctic sea ice anomaly in 2007 a key contributor to severe January 2008 snowstorm in China?
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2007年北极海冰极端异常是否是导致2008年1月中国严重暴风雪的主要原因?

DOI:
10.1002/joc.2400
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发表时间:
2012-11
期刊:
International Journal of Climatology
影响因子:
--
通讯作者:
Liu Na, Liu Jiping, Zhang Zhanhai
Liu Na, Liu Jiping, Zhang Zhanhai
中科院分区:
其他
文献类型:
--
作者:
Liu Na, Liu Jiping, Zhang Zhanhai

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利用大气环流模式对2007年北极海冰极端异常是否对2008年1月中国特大暴雪有贡献进行了数值试验。结果表明,2007年9月北极海冰创纪录的低水平,以及2007年10月和11月北极海冰的后续缓慢恢复,可以激发两个定常波结构。一个波列从巴伦支海/喀拉海向东南传播到亚洲中部,加强了中东急流(MEJS),另一个波列从北冰洋中部/东西伯利亚海向南传播到北太平洋中纬度和副热带,减弱了东亚急流(EAJS)。伴随着中尺度对流系统加强的异常西风带和伴随着东亚对流系统减弱的异常东风带在我国中南部形成了一个强辐合带,为2008年1月特大暴雪的发生提供了有利条件。皇家气象学会
We conduct numerical experiments with an atmospheric general circulation model to answer the question whether the extreme Arctic sea ice anomaly in 2007 contributed to the severe January 2008 snowstorm in China. Results show that the record low Arctic sea ice in September 2007, and follow‐up slow recovery of the Arctic sea ice in October and November 2007 could excite two stationary wave structures. One wave train propagates southeastward from the Barents/Kara Seas to central Asia, strengthening the Middle East Jet Stream (MEJS), and the other wave train propagates southward from central Arctic Ocean/eastern Siberia Sea to the mid‐latitude and subtropics of the north Pacific, weakening the East Asian Jet Stream (EAJS). The anomalous westerlies associated with the strengthening of the MEJS and the anomalous easterlies associated with the weakening of the EAJS form a strong convergence zone over central and southern China, providing favorable conditions for the severe January 2008 snowstorm. Copyright © 2011 Royal Meteorological Society
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