J4 ›› 2008, Vol. 26 ›› Issue (1): 57-63.

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AnalysisofMoistPotentialVorticityforaSnowstormProcess intheNortheastSideofQinghai-XizangPlateau

 MA Xin-Rong, LIN Tu-Long, DING Chi-Yang   

  1. 1.GannanMeteorologicalBureauofGansuProvince,Hezuo747000,China;2.LinxiaMeteorological BureauofGansuProvince,Linxia731100,China;3.DepartmentofAtmosphericSciences, NanjingUniversityofInformationScience&Technology,Nanjing210044,China
  • Received:2008-01-16 Revised:2008-02-28 Online:2008-03-31 Published:2008-03-31

青藏高原东北侧一次暴雪过程的湿位涡分析

马新荣1,2,任余龙2,3,丁治英3   

  1. (1.甘肃省甘南州气象局,甘肃 合作 747000;2.甘肃省临夏州气象局,甘肃 临夏 731100;3.南京信息工程大学大气科学学院,江苏 南京 210044)
  • 作者简介:马新荣(1980 - ) ,男,甘肃武威人,学士,助理工程师,主要从事短期天气预报及研究. E - mail:ma. xinrong@163. com
  • 基金资助:

    甘肃省气象局青年科技开发基金项目资助

Abstract:

A Snowstorm occurred on October 18, 2002 in the northeast side of the Qinghai - Xizang Plateau was analyzed by using the
global re - analysis data (1°×1°) ofNCEP. The results show that the p lateau’s shear line generated by the combination of the south2
west warm moist currentmoving northward at 500 hPa and the northwest cold airmoving to east and west in the region near 36°N resul2
ted in this weather event. This snowstorm occurred in an intensive belt of positiveMPV1 at 700 hPa and a negative area ofMPV2. The
increase of the absolute value ofMPV2 and atmospheric moist baroclinicity with the atmospheric convective unstable energy releasing,
and the down - sliding slantwise vorticity developmentwere the important reason for the formation of the snowstorm. It has a good indic2
ative effect for the snowstorm forecast.

Key words: moist potential vorticity, slantwise vorticity

摘要:

利用(1b@1b)全球再分析格点资料,对青藏高原东北侧2002年10月18日一次暴雪天气进行诊断分析"结果表明:500北上的西南暖湿气流与东移南压的西北冷空气在36b附近交汇形成的高原切变线是造成这次强降水的主要天气系统"暴雪发生在700湿位涡正压项1正值密集带和湿位涡斜压项2负值区中"由于等He线变得陡立密集,大气对流不稳定能量释放,2绝对值增大,大气湿斜压性增强导致下滑倾斜涡度发展是形成此次暴雪的重要原因,它对暴雪预报有着很好的指示作用"

关键词: 暴雪, 湿位涡, 倾斜涡度

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