论文

一次鞍型场环流背景下高原东部切变线降水的湿Q矢量诊断分析

  • 李山山 ,
  • 李国平
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  • 成都信息工程大学大气科学学院, 成都 610225

收稿日期: 2015-11-20

  网络出版日期: 2017-04-28

基金资助

公益性行业(气象)科研专项(GYHY201206042);国家自然科学基金项目(41675057,91337215)

Diagnostic Analysis Based on Wet Q-Vector of a Shear line with Rain on the East side of Qinghai-Tibetan Plateau under the Saddle Pattern Circulation Background Field

  • LI Shanshan ,
  • LI Guoping
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  • School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China

Received date: 2015-11-20

  Online published: 2017-04-28

摘要

利用NCEP1°×1°再分析资料和中国自动气象站与CMORPH融合的逐时降水资料,采用非地转湿 Q 矢量和水汽通量散度,对2013年7月28-29日一次高原东部切变线引起的强降水进行了诊断分析。研究结果表明强的辐合切变线沿着变形场的拉伸轴分布,切变线位于上升区和下沉区之间。500 hPa非地转湿 Q 矢量与未来6 h的累积降水中心有很好的对应关系。水汽通量散度场显示水汽辐合带基本位于切变线上,风场的分布对水汽的辐合作用尤为重要。水汽辐合带和非地转湿 Q 矢量辐合带的重叠区对强降水落区有较好的指示意义。

本文引用格式

李山山 , 李国平 . 一次鞍型场环流背景下高原东部切变线降水的湿Q矢量诊断分析[J]. 高原气象, 2017 , 36(2) : 317 -329 . DOI: 10.7522/j.issn.1000-0534.2016.00025

Abstract

Using NCEP global 1°×1° final-analysis data and hourly merged precipitation data of automatic weather station in china and CMORPH satellite data, with the theories of non-geostrophic wet Q -vector and moisture flux divergence, a heavy rain caused by a shear line on the east side of Qinghai-Tibetan Plateau on 28-29 July 2013 have been diagnostically analyzed. The results show that: The strong convergence shear line is along the stretching axis orientation of deformation field, which is located in the area between ascending and sinking movement. Horizontal distribution of 500 hPa non-geostrophic wet Q -vector have a good prediction of the next 6 h cumulative precipitation centre. The moisture flux divergence field shows that moisture convergence band is situated in shear line basically, and the distribution of wind field has a very important effect on moisture convergence. Moreover, the overlapping areas of moisture convergence band and non-geostrophic wet Q -vector convergence band have better implications of the heavy precipitation areas.

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