西双版纳2021年冬末盛夏暴雨对比分析  

Comparative analysis of heavy rain in Xishuangbanna in late winter and midsummer in 2021

作　　者：高栋斌 桑二 桑锐 张能 GAO Dongbin;SANG Er;SANG Rui;ZHANG Neng(Meteorological Bureau of Xishuangbanna Dai Autonomous Prefecture,Jinghong 66100,China;Jinghong Meteorological Bureau,Jinghong 66100,China;Mengla County Meteorological Bureau,Mengla 666300,China)

机构地区：[1]西双版纳傣族自治州气象局,云南景洪666100 [2]景洪市气象局,云南景洪666100 [3]云南省勐腊县气象局,云南勐腊666300

出　　处：《黑龙江环境通报》2023年第1期49-51,共3页Heilongjiang Environmental Journal

摘　　要：利用ERA5欧洲中心再分析资料、常规观测资料对比分析了2021年2月7~9日和7月19~21日西双版纳冬夏暴雨天气。结果表明:(1)500hpa南支低压槽加深东移和700hPa低空急流充沛的水汽输送并急剧辐合以及低层切变线或辐合区扰动触发抬升利于冬季暴雨发生;夏季暴雨是在500hPa“东高西低”高压环流间低涡持久稳定和热力抬升低层大量的水汽至暴雨区上空引发强辐合上升运动下产生的;(2)大气边界层弱偏强冷平流利于冬季暴雨发生,近地面极弱的冷平流是夏季暴雨发生的有利条件。By using reanalysis data of ERA5 European Center and conventional observation data, the winter and summer rainstorms in Xishuangbanna on February 7th to 9th and July 19th to 21st, 2021 were comparatively analyzed. The results showed that:(1) the deepened eastward movement of the 500hpa low-pressure trough and the abundant water vapor transport of 700hPa low-level jet and the rapid convergence, as well as the disturbance of low-level shear line or convergence area triggering the uplift, were conducive to the occurrence of winter rainstorms;Summer rainstorm is caused by the persistent stability of the low vortex between the high-pressure circulation of 500hPa "high in the east and low in the west" and the strong convergence upward movement caused by the thermal lifting of a large amount of water vapor in the lower layer to the rainstorm area.(2) The weak and strong cold advection in the atmospheric boundary layer is favorable for the occurrence of heavy rain in winter, and the extremely weak cold advection near the ground is favorable for the occurrence of heavy rain in summer.

关 键 词：南支槽 低涡 冷平流 

分 类 号：P458.3[天文地球—大气科学及气象学]