Influence of Prior Thermal State of Global Oceans on the Formation of the Disastrous Snow Storm in January 2008
Influence of Prior Thermal State of Global Oceans on the Formation of the Disastrous Snow Storm in January 2008
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发表时间：
2008
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通讯作者：
Fu Jian
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作者：
Fu Jian
研究了2008年1月华南暴雪冰冻气候事件发生前的全球海洋热状况，结果表明，热带太平洋的强拉尼娜a事件和温带北大西洋的匿名变暖最为显著。此外，北太平洋中部和海冰延伸较少的北欧海也变暖。本文通过分析大气环流模式（AGCM）的观测资料和实验，探讨了拉尼娜a事件的影响。结果表明，强拉尼娜a可以解释华南地区气候偏冷、降水偏多以及与之相关的蒙古冷高压等环流异常。但是，它不能解释西太平洋副热带高压和乌拉尔山上空阻塞高压的增强。随后，我们利用先前模式研究的结果讨论了北大西洋变暖的影响，并推测该变暖对乌拉尔上空持续阻塞的维持起了重要作用。因此，2008年1月发生的灾难性气候事件可能是强拉尼娜a和北大西洋变暖等多种因素协同作用的结果。
The global ocean heat status prior to January 2008,when the disastrous snowstorm freezing climate event occurred in South China,was investigated,and the results suggest that the strong La Nia event in the tropical Pacific and the anonymous warmth in the extratropical North Atlantic are the most significant.Additionally,there is warmth in the central North Pacific and in the Nordic Sea where has less sea ice extension.By analyzing the observational data and conducting experiments in an atmospheric general circulation model(AGCM),we investigated the influence of the La Nia event.The results show that the strong La Nia can explain the colder climate and more precipitation than usual in South China,as well as the associated circulation anomalies like Mongolia Cold High.But,it cannot explain the enhancements of the west Pacific subtropical high and the blocking high over the Ural Mountains.Subsequently,we discussed the influence of the North Atlantic warmth using the results from a previous modeling study,and speculated that the warmth has played an important role for the maintenance of the persistent blocking over the Urals.Thus,it is concluded that the disastrous climate event happened in January 2008 may be resulted from the coordinate interaction of several factors including strong La Nia and North Atlantic warmth.