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中文摘要: 应用湿位涡理论,分别对阿克苏北部2次暴雨和冰雹过程进行诊断分析。结果表明:θse面陡立易导致湿斜压涡度发展,形成θse陡峭密集区,密集区内暴雨和冰雹容易发生;850hPa MPV1<0和MPV2>0以及700hPa MPV1>0和MPV2<0,易产生暴雨,且MPV1和MPV2数量级相当,即正压过程与斜压过程同样重要。冰雹发生时850hPa MPV1>0和MPV2<0,由于影响系统的不同,700hPa MPV1和MPV2分布有所不同,但存在MPV1和MPV2的正负配置,有利于倾斜涡度发展。
中文关键词: 湿位涡，倾斜涡度，暴雨，冰雹
Abstract:The characteristics of moist potential vorticity are analyzed during two heavy rainfall and two hail events in Northern Akesu. The results show that the stiff moist isentropes excite the development of moist slantwise vorticity and occurrence of heavy rainfall and hail. When MPV1<0 and MPV20 at 850hPa and MPV1>0 and MPV2<0 at 700hPa,sudden heavy rainfall probably happen. The order of magnitudes of MPV1 and MPV2 is equivalent. When hail occurred, there are MPV1>0 and MPV2<0 at 850hPa. Because of the difference of affective systems, there are different distributions for MPV1 and MPV2 at 700hPa, but reverse of MPV1 and MPV2 lead the development of slantwise vorticity.
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基金项目:国家科技部社会公益研究专项(塔里木河流域气候暖湿化及人类活动对地表水资源的影响)，国家科技部重大基础研究前期研究专项(2002cca04600)，新疆气象局青年基金课题(C20010724)。
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引用文本：
杨莲梅,杨涛,2005.阿克苏北部暴雨和冰雹湿位涡对比诊断分析[J].气象,31(9):13-18.
,2005.Diagnostic Analysis of Moist Potential Vorticity for Heavy Rainfall and Hail in Oasis of Northern Akesu[J].Meteor Mon,31(9):13-18.
杨莲梅,杨涛,2005.阿克苏北部暴雨和冰雹湿位涡对比诊断分析[J].气象,31(9):13-18.
,2005.Diagnostic Analysis of Moist Potential Vorticity for Heavy Rainfall and Hail in Oasis of Northern Akesu[J].Meteor Mon,31(9):13-18.