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Analysis on the moist potential vorticity for a heavy rainstorm process in the southeast coastal areas of China(东南沿海一次大暴雨过程的湿位涡分析)
Authors
ZHANGLingjie(张灵杰)
Publication date
1 December 2015
Publisher
Zhejiang University Press
Doi
Abstract
应用自动站和NCEP 1°×1°再分析资料,对2010年7月24日发生在东南沿海的一次大暴雨过程的湿位涡场进行了诊断分析.结果表明:鞍形场低层东南风低空急流输送的暖湿气流和对流层中低层来自东北方向的冷空气相互交汇是此次大暴雨发生的触发因子,大暴雨期间暴雨区上空对流层中低层等θse线较稀疏且陡立,大气对流稳定度较低,有利于湿斜压涡度发展,大暴雨发生在600 hPa上MPV、MPV1和MPV2正负过渡带附近,MPV1下负上正垂直叠加配置是暴雨发生发展的有利形势,湿位涡在900 hPa以下具有MPV1为负、MPV2为正的特征,当800 hPa以上MPV1正大值区变弱和900 hPa以下MPV2由正大值变为负大值时,大暴雨过程基本结束
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Last time updated on 08/08/2024