1985年盛夏强和弱辐合带的热带大气环流特征

作者：杨祖芳  王文东

单位：国家气象局中央气象台, 北京

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出版年·卷·期（页码）：1987·4·第三期（15-24）

摘要：

本文运用90-180°E热带地区的多种月平均资料及恢平均资料,对1985年7月弱辐合带和8月强辐合带的热带大气环流特点作了分析。得到:强辐合带时,对流层低层来自南半球的越赤道气流范围广、强度强,南亚西南季风强,辐合带位置偏北且辐合强,西北太平洋台风发生的主要地区海平面气压月距平为负值区及微弱正值区;对流层上部从北半球向南半球的越赤道气流也强,且南风分量在垂直方向上自下而上递减,200hPa上强烈辐散处的下方为低空辐合带,对流层上部槽(以下简称TUTT)的位置较常年偏北、偏西。弱辐合带时的情况则相反或有着很大不同。

In this paper, characteristics of the tropical general circulation during the strong ITCZ period of August and weak ITCZ period of July,1985 are studied by using some kinds of monthly mean and pentad mean data over the tropical area between 90°-180°E. The results show that, during the strong ITCZ period,the cross-equatorial flow from the Southern Hemisphere is strong and extensive, the southwest monsoon in Touth Asia is also strong,the position of ITCZ is northerly and has convergence enhanced,the mothly sea surface pressure anomaly at the main sources of typhoon over northwestern Pacific is negative or minutely positive;on the other hand,the cross-equatorial flow from the Northern Hemisphere upper troposphere is strong and the south component of wind speed decreases vertically from the lower to upper troposphere,the low-level ITCZ is below the strongest divergence region at 200 hPa, the position of TUTT is further northerly and westerly than normal. However, cases are converse to or very different from the above during the weak ITCZ period.

参考文献：

[1] 陈联寿、丁一汇西大平洋台风概论 科学出版社 1979年. [2] 中央气象台 亚洲和太平洋热带地区的对流层平均环流 单行本 1976年. [3] Department of Meteorology, University of Haxwall the Upper tropnspheric Circulatiop Over the global tropics.1975.

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