0509号台风麦莎影响山东分析

ANALYSIS OF TYPHOON MATSA (NO.0509) AFFECTING SHANDONG PROVINCE

分析了0509号台风的移动路径、强降水分布及物理量场分布,重点分析台风在安徽突然转向东北和强降水不在中心附近而是偏于中心东北侧的原因。结果表明:副高突然南落及200hPa辐散偏向台风中心右侧是台风在安徽转向进入江苏的原因;台风进入西风带以后没有明显的冷空气侵入;台风进入山东前,半岛大暴雨是由台风右侧东南急流和切变线引起,而台风进入山东境内时,鲁北、鲁中强降水由台风倒槽引起。

The characteristics of the moving course of Typhoon Matsa （No.0509）, associated heavy rain and physical quantities fields have been analyzed, with focus on the reason of the typhoon＇s abrupt northeastward turn in Anhui Province and heavy rain concentrating in the northeast of typhoon center instead of near it. Meaningful conclusions are as follows. The reasons of typhoon abrupt turning are that the subtropical high pressure was moving southward and divergence fields of 200 hPa were to the right of the typhoon center; there was no obvious cold air invading Shandong after the typhoon entered the westerly belt; the southeasterly jet of typhoon and shear brought heavy rainfall to the Shandong peninsula before the typhoon entered Shandong. But after the typhoon＇s movement into Shandong, the typhoon＇s inverted trough brought the rainfall to the northern and central Shandong.