湿位涡诊断在青藏高原东北侧暴雪预报中的应用个例  

The application of wet potential vorticity diagnosing to forecast of blizzard in northeast of Qinghai-Tibet Plateau

作　　者：艾丽华 井喜 王淑云 胡春娟[3] 李栋梁[4] 

机构地区：[1]陕西省榆林市气象局,陕西榆林719000 [2]河北省沧州市气象台,河北沧州061001 [3]陕西省气象台,西安710015 [4]南京信息工程大学,南京210044

出　　处：《气象科学》2008年第B12期92-96,共5页Journal of the Meteorological Sciences

基　　金：中国气象科学研究院灾害天气国家重点实验室基金(2007LASW10)

摘　　要：利用湿位涡理论,对2006年1月18—19日发生在青藏高原东北侧大范围暴雪天气进行了诊断分析,以探讨湿位涡诊断在青藏高原东北侧暴雪预报中的应用前景。个例分析表明:850 hPa和东风回流以及横切变耦合的正湿位涡高值区和500 hPa青藏高原东侧大槽前正湿位涡平流、300 hPa青藏高原东侧大槽前新生正湿位涡中心的叠加,形成有利于暴雪发生发展的湿位涡和湿位涡平流配置的三维空间结构;850 hPa等压面湿位涡正压项(ζMPV2)等值线密集区和等压面湿位涡斜压项(ζMPV1)<-2.0 PVU的中α尺度对流不稳定区形成的耦合区,对暴雪落区有指示意义。The blizzard at large-scale from Jan. 18 to 19, 2006 in northeast of Qinghai-Tibet Plateau is analyzed by using the wet potential vorticity method in order to discuss the foreground of applying wet potential vorticity diagnosing to forecast of blizzard in this area. Case study indicated that it was the dense wet barotropic isolines in front of the coupled high value belt in low trough at 500 hPa and 300 hPa, the strong positive wet potential vorticity advection area pointing to northeast, and the high value belt at 850 hPa that formed the 3-dimension structures of wet potential vorticity whose configuration benefited to the occurrence of blizzard. Creation of β - scale strong convective unsteady core area on 850 hPa of ζMPV1 〈 -- 4. 0 PVU has the direction meaning to the occurrence of blizzard. And the coupled area formed by ζMPV2 dense isolines and strong convective unsteady area of ζMPV1〈 -2. 0 PVU was meaningful in order to predict the falling area of blizzard.

关 键 词：暴雪 湿位涡 青藏高原东北侧 

分 类 号：P457.6[天文地球—大气科学及气象学]