冬季北极喀拉海、巴伦支海海冰面积变化对东亚冬季风的影响

通过大量的数据分析发现，冬季喀拉海、巴伦支海海区是影响东亚以及北半球气候变化的关键区之一，该海区海冰面积变化与大气500 hPa高度场的EU遥相关型以及东亚冬季风强、弱之间存在密切的关系。冬季该海区海冰偏多，则500 hPa高度场容易出现EU遥相关型（日本及西欧500 hPa高度场偏高），亚洲大陆上的冷高压减弱，而北太平洋海域海平面气压升高，致使东亚冬季风偏弱以及2月份入侵我国的冷空气次数减少；而冬季该海区海冰偏少时，情况正好相反。

The Impact of Variation of Sea-Ice Extent in the Kara Sea and the Barents Seas in Winter on the Winter Monsoon Over East Asia

By analyzing the observation data, it is shown that the region of the Kara Sea and theBarents Sea is a key region to influence climate variation over the Northern Hemisphere. The variationof winter sea-ice extent in the key region is closely associated with that of the EU teleconnection patternat 500 hpa level and the winter monsoon intensity over East Asia. When the heavy sea--ice prevails inthe key region, the EU teleconnection pattern at 500 hpa level is excited easily (there are Positive 500hpa height anomalies over around Japan and West Europe), and winter Siberia High is weakened.Meanwhile, sea-level pressure appears positive anomaly over the Northern Pacific. Therefore, the winter monsoon over East Asia will be weakened and the number of cold--air activities in February overChina will be decreased. When light sea--ice occurs in the key region, the results will be opposite.