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
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

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.