摘要
20 0 1年云南初夏洪涝与孟加拉湾 (简称孟湾 )云的活动密切相关 ,本文分析了云南强降水过程中几次孟加拉湾云团发展的大尺度动、热力背景和卫星云图的TBB特征。结果表明 :孟加拉湾北上云贵高原的对流云必须得到足够的辐合和抬升动力 ,才能在高原维持和进一步发展 ;青藏高原横槽是孟加拉湾云团在云贵高原产生强降水的重要天气系统 ;孟加拉湾云团的发展与正压和斜压不稳定均有关系 ;冷空气对北上孟加拉湾云团的发展至关重要 ,它不但有利于水汽凝结量的增加 ,还有利于形成强降水天气发生的动力、热力环境 ;TBB分布更直观地反映了孟加拉湾云团的活动 ,≤ - 5
Yunnan severe precipitation has a good relation to the activity of convective cloud clusters over the Bay of Bengal in early summer.Heavy rainfall processes aroused by such cloud clusters (CC) are studied in this paper,indicating that the Tibetau trough is favourable for the CC development,which needs enough convergence and lifting.Both of barotropic and baroclinic instability are related to the enforcement of CC.Moreover,cold air is an important factor responsible for heavy rainfall,which likely occurs in the TBB low value area of ≤-52 ℃.
出处
《气象科学》
CSCD
北大核心
2003年第2期185-191,共7页
Journal of the Meteorological Sciences
基金
云南省气象局"十五"攻关课题"云南省季风区中尺度天气系统及预报方法研究"资助
关键词
孟加拉湾
云团
云南强降水
The Bay of Bengal Convective cloud clusters Severe precipitation
