摘要
文章应用湿位涡理论 ,分析了发生在东南亚夏季的两个强降水个例 ,讨论了湿位涡与东南亚强降水形成的关系。东南亚夏季具有利于强降水发生的湿位涡场分布特征 ;强降水的发展与湿位涡的变化有很好的对应关系 :当对流层低层MPV1<0、同时MPV2 ≥ 0时 ,易产生强降水 ;当对流层高层MPV1正值区与低层MPV1负值区相互作用 ,即高层下滑的干冷空气与低层上升的高温高湿空气交汇 ,容易贮存和释放湿对流不稳定能量 ,有利于强降水产生。湿位涡理论在东南亚强降水诊断中有很好的应用前景。
Two processes of heavy rain occurred in summer in the East-South Asia in terms of moist potential vorticity (MPV)are analyzed. The relationship between MPV and heavy rain in the East-South Asia is discussed.The results show that there are favourable distributions of MPV in the heavy rain occurred in summer in the East-South Asia.The change of MPV corresponds to the heavy rain. When MPV 1<0 in the low tropospheric and MPV 2≥0,there are advantageous fields of heavy rain. On the other hands when the dry and cold air from the high level interacts the warm and moist air from the low level ,it is easy to store and release the convective instability energy,and it is useful for heavy rain occurring.
出处
《气象科技》
北大核心
2003年第1期23-28,共6页
Meteorological Science and Technology
基金
国家重点基础研究发展规划项目"我国重大气候灾害形成机理及预测理论研究"( 19980 40 90 3)资助
