台风云娜后部强降水分析

通过对中尺度自动站、常规气象要素、1°×1°NCEP格点资料和多普勒雷达资料的诊断分析,发现台风云娜登陆后西行路径对其后部的强降水起了关键性作用;高层辐散和低层辐合差加大,抽吸作用加强,上升运动加剧是后部降水加强的动力原因;沿海较冷的温度场配合台风后部强烈的东南偏南水汽输送,是台风后部降水加强的热力原因;台风后部海面上形成北上的螺旋雨带是造成台风后部强降水的直接原因;浙江东部地形与台风后部强烈的东南偏南水汽输送正交是造成台风后部降水增幅的重要原因。该分析结果对今后台风预报服务实际工作具有一定的参考作用。

Analysis of Heavy Rain at the Rear of Typhoon Rananim

A heavy rain at the rear of typhoon Rananim is analyzed, based on the observations mesoscale automatic weather stations data in a mesoscale network, regular meteorological, 1°×1° NCEP reanalysis dataset and CINRAD Doppler radar data. The results reveal that after typhoon landing, the intensively ascending motion of middle-upper level and intensive and continuous moisture transport in lower levels caused the heavy rain in northern Wenzhou and southern Taizhou. The analysis radar echo shows that the spiral cloud bands of typhoon is the direct reason which caused the heavy rain at the rear part of typhoon.