西北太平洋热带辐合带三维结构分析

作者：范蕙君  李修芳

单位：国家气象局气象中心

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出版年·卷·期（页码）：1985·2·第二期（19-25）

摘要：

本文用格点风资料分析1978年7月和10月热带辐合带(ITCZ)强盛时期的结构。发现ITCZ上散度、垂直速度的分布是不均匀的,其分布与云场紧密相关。进一步指出,在经圈平面上,ITCZ云区上空有上升运动,上升气流分别向北到达副热带下沉,向南到达赤道缓冲带下沉。在ITCZ南侧西南季风云系上空也有上升运动,而沿ITCZ方向上,在云区上空为上升运动,而无云区上空为下沉运动。 最后,给出ITCZ的三维结构模型图。

By using the grid-point data of upper wind, we have analysed the structure of two intensive ITCZ which existed separately in July and Oct. 1978. It has found that, the distributions of divergence and vertical velocity within the ITCZ are non-uniform and they are closely related to the cloudiness field. Furthermore, along the meridional plane there is an ascending motion over the cloud zones of ITCZ, which turns descending while reaching northwards the subtropical zone and southwards the equatorial buffer zone. To the south of the ITCZ over the southwest monsoon area there also is an ascending motion. Along the direction of the ITCZ the ascending motion occurs over the cloud cluster areas and the descending motion over the cloudless sectors. Finally, a three~dimensional picture of the ITCZ has been tentatively given in this paper.

参考文献：

[1] 广东省热带海洋气象研究所, 南海热带辐合带活动的初步分析, 热带会议论文集, 1976. [2] 大气所热带气象研究组, 海洋环境预报中心远洋气象顶报组, 1974年8月份西太平洋及南海地区热带辐合带环流及其结构的初步分析, 热带天气会议论文集, 1976. [3] Estogue, M.A., Structure of the Mid-Oceanic Intertropical Convergence Zone, J. Meteor, Soc, Japan, 53.5, 1975, 317-321. [4] Godbole, R. V., Ghosh. S. K., The Structure of the intertropical Convergence Zone and equatorial Westerlies during MONEX-1973 Tullus, 27.2, 1975, 123-132. [5] 方宗义等, 西太平洋赤道辐合带的初步分析, 大气所集刊2号, 1974.

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