9403号强热带风暴水汽通量非对称研究

用实测资料对9403号南海强热带风暴(简称TC，以下同)登陆前后的物理结构变化作了分析，对其水汽通量、动力学等特征量进行了计算。研究结果表明：TC的水汽通量分布不对称，辐合主要在边界层中，辐合最大值出现在TC登陆前南半圆边界层附近：风速分布不对称，气旋性切向风大值区位于TC东半圆；风速垂直切变随TC加强而减弱。强流入位于TC南半圆400hPa以下，流入大值区在850hPa附近；高层反气旋流出在150-100hPa层附近，流出主要位于TC北半圆。TC垂直运动分布不对称，上升最大值出现在南半网。TC整个生命期均具有暖心结构，300hPa附近增暖最明显。

A Study on the Asymmetric Water-vapour Flux of Tropical Cyclone 9403

Based on the observed data, the article analyzes the change of physical structure of Tropical Cyclone 9403, calculates the water-vapour flux and dynamic feature of TC9403. The results show that the distribution of water-vapour flux of Tropical Cyclone 9403 isnt symmetrical. The convergence primarily appears in the boundary layer, the maximum of convergence occurs before TC9403 lands on the south half-round boundary layer. The distribution of wind is asymmetrical, the maximum of cyclonic shear of wind lies in the east half-round of TC. With TC strengthening the vertical shear becomes weaker. The strong afflux lies in the south half-round of TC below the 400 hPa layer. The maximum zone of afflux occurs in about the 850 hPa layer. The anticyclone in high yield effuses in about the 150 hPa-100 hPa layer, and the outflow mostly appears in the north half-round of TC. The distribution of TC's vertical motion is asymmetrical, and the maximum rise appears in the south half-round. There is a warm-heart structure in the TC's whole life, and TC becomes warmer obviously in the 300 hPa layer.