China's snow disaster in 2008, who is the principal player?
China's snow disaster in 2008, who is the principal player?
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DOI：
10.1002/joc.1859
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发表时间：
2009-11
期刊：
影响因子：
--
通讯作者：
Gao Hui
中科院分区：
文献类型：
--
作者：
Gao Hui
2008年1月发生的特大雪灾给中国造成了严重的人员伤亡和经济损失。有人认为拉尼娜事件是主要原因。但分析表明，2007年12月热带地区的环流形势与2008年1月的环流形势非常相似。相反，在高纬度地区，特别是西伯利亚高压（SH）和北极涡（NPV）存在较大的差异。其他极端大雪年和小雪年之间也存在差异。在极端重（轻）雪年，SH更强（弱），NPV更深（浅）。但这些极端降雪事件与ENSO事件并没有很好的对应。统计结果还表明，SH和NPV都与ENSO无关。因此，与拉尼娜事件相比，高纬度地区的异常环流可能在这次雪灾中起着更重要的作用。版权所有© 2009皇家气象学会
The unprecedented snow disaster in January 2008 brought serious human and economic losses to China. It has been suggested that the La Nina event is the principal cause. But analysis indicates that in December 2007, the circulation patterns in the tropical regions are quite similar with those in January 2008. In contrast large differences existed at high latitudes, especially the Siberia high (SH) and the north polar vortex (NPV). The differences can also be found between other extreme heavy and light snow years. In the extreme heavy (light) snow years, the SH is stronger (weaker) and the NPV is deeper (shallower). But these extreme snow events don't correspond to ENSO events well. Statistical results also indicate that both the SH and the NPV are independent of ENSO. So, rather than the La Nina event, the abnormal circulations at the high latitudes may play a more crucial role in making this snow disaster. Copyright © 2009 Royal Meteorological Society