冬季大气环流对北太平洋海冰和黑潮暖流海温的强迫作用  

Sea-Ice in the North Pacific and the Kuroshio SST Relation to Forcing of the Winter Monsoon

作　　者：方之芳[1] 

机构地区：[1]成都气象学院

出　　处：《大气科学》1996年第5期541-546,共6页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院"灾害性气候预测及其对农业年景和水资源调配影响"项目

摘　　要：本文应用奇异值分解等统计方法，探讨冬季北太平洋海冰浓度、海温与大尺度大气环流型间的联系。分析结果表明：冬季北太平洋海域海冰存在一个主要的分布型，即鄂霍次克海和白令海的海冰呈反位相。海冰的该种分布特征是与大气中的ＷＰ型紧密联系的，并以大气超前海冰一个月最为明显。同时，ＷＰ型强迫作用于黑潮暖流区的海温，海温滞后大气一个月。具体表现为在东亚冬季风较弱的年份，鄂霍次克海海冰增多，白令海海冰减少，黑潮暖流区海温增高，反之则相反。In this paper, the relationship among large scale patterns of the atmospheric variability,sea ice concentration and SST over the north Pacific in winter is investigated using Singular Value Decomposition (SVD) of the temporal covariance matrix. The conclusions are as follows f the strongest sea ice pattern over Pacific sector is comprised of a dipole with opposing centers of action in the Sea of Okhotsk and the Bering Sea. Its temporal variability is strongly coupled with the atmospheric West Pacific Pattern (WP), the relationship between the two patterns is the strongest with the pattern formed in the atmosphere one month earlier than in the sea-ice. The WP pattern also affects SST in the Kuroshio one month later. When the 500 hPa height anomalies are negative over 60°N, 150°E, and positive over 30°N, 150°E, the north part of the East Asia trough is stronger than normal, and the storm track propagates to rather north of its climatic mean position. In SLP field, the Mongolia high and the Aleutian low are weaker than normal, it is a weaker winter monsoon situation is East Asia. The northerly wind covering the sea of Okhotsk replaces the normal easterly wind, which would be conducible to the advance of the ice edge. The south-east wind covers the Bering sea which probably the result of reduced southward transportation of sea ice. The northly wind over the East Japan in the Pacific is weaker than normal, and would cause positive anomalies SST in the Kuroshio, and vice versa.

关 键 词：海冰 大气环流 黑潮 暖流 海温 强迫作用 

分 类 号：P731.15[天文地球—海洋科学] P731.27