摘要
利用常规观测资料、中尺度自动站加密资料、多普勒雷达资料和NCEP 1°×1°再分析资料,对2010年5月8—9日发生在浙南的一次暴雨过程进行了诊断分析,结果发现:此次暴雨是在横槽转竖的大背景下,西风槽和高原槽东移合并加强,并在东移过程中与低层切变共同作用造成的;低空急流的形成在水汽的输送和聚集过程中发挥了重要作用;暴雨过程水汽源地在南海和孟加拉湾;高层辐散、低层辐合的配置有利于暴雨的发生;θse锋区逼近触发了对流不稳定能量释放,导致对流性暴雨强烈发展,暴雨发生在等θse密集带南侧或附近地区;垂直螺旋度及其剖面图对暴雨的落区预报有一定的指示作用。
The heavy rainfall which happened in southern Zhejiang on 8--9th May, 2010 was diagnosed and analyzed by using the conventional observation data, mesoscale automatic weather station intensive data, the Doppler radar data and the NCEP 1 °× 1 ° reanalyzed data. The results are as followed. The heavy rainfall was caused of the low-level shear and the combining and strengthening westerly trough and plateau trough of heading eastward under the background of the transversal trough turning upright. The formation of low-level jet has played an important role in water vapor transport. It is found that South China Sea and Bay of Bengal were the headstream of water vapor of the heavy rainfall. The allocation of the lower-level convergence and upper-level divergence was favourable to the heavy rainfall. The/ge front approximation caused instability energy released and further leaded the heavy rainfall happened. The vertical helicity was helpful to forecast the rainstorm area.
出处
《气象与环境科学》
2011年第4期46-51,共6页
Meteorological and Environmental Sciences
基金
十二五科技支撑计划项目(2012BAD20B00)资助
