2012.8.6云南省大雨过程诊断分析  

Heavy rain process diagnostic analysis of the Yunnan province in 2012.8.6

作　　者：钟爱华 李庆红 黄慧君 周泓 

机构地区：[1]云南省大理州气象局,云南大理671000 [2]云南省玉溪市气象局,云南玉溪653100

出　　处：《云南大学学报（自然科学版）》2013年第S1期261-269,共9页Journal of Yunnan University(Natural Sciences Edition)

基　　金：云南省气象局预报员技术开发专项项目(YB201208)

摘　　要：分析了2012年8月6日云南省大雨过程的影响系统、物理量特征.结果表明:此次全省性强降水过程的主要影响系统是登陆减弱后的热带低值系统外围的偏东气流;降水开始前,云南上空是能量的高值区且大气处于不稳定状态;从水汽条件看,过程开始前云南大部处于高湿区,滇西北的湿度条件较好,但过程开始后偏东气流给滇西北以外的大部地区输送了大量水汽,对降水的维持提供了有利的水汽条件;过程开始前及主要降水时段,滇中及以东地区有水汽辐合且这种辐合维持时间短.在强降水发生时段,垂直运动提供了有利的动力机制,上升运动释放了不稳定能量.The impact system and physical characteristics of the heavy rain process of Yunnan province which occurs in 6 August,2012 is analyzed.It shows that the major impact system of the provinces strong precipitation process is the easterly air stream landing weakened tropical low-pressure system peripherals;It is energy-intensive areas over the Yunnan province and the atmospheric stratification is in unstable state before the heavy precipitation starts.Most of Yunnan in a high humidity area and the humidity conditions of northwest Yunnan is better than other area before the heavy rain occurs in water vapor condition.When heavy rainfall occurs,easterly air stream transports a lot of water vapor to most areas outside the northwest of Yunnan.The easterly air stream is the favorable water vapor conditions to provide precipitation maintaining.There is moisture convergence in central Yunnan and the eastern of Yunnan before the process starts and during the major precipitation periods.But the moisture convergence maintains a short time.During the heavy precipitation occurs,the vertical movement provides the favorable dynamic mechanism meanwhile the upward motion releaseas the unstable energy.

关 键 词：大雨 水汽 热带低值系统 云南 

分 类 号：P458.121[天文地球—大气科学及气象学]