Numerical Simulation Studies on "2012·7·29" Rainstorm Process in Ningxia

  • WANG Hui ,
  • LONG Xiao ,
  • WEN Xiaopei ,
  • TIAN Feng ,
  • LIU Yanfei
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  • Central Meteorological Observatory, Lanzhou 730000, China;Atmospheric Science College of Lanzhou University, Lanzhou 730020, China;Shizuishan Meteorological Bureau of Ningxia, Shizuishan 753000, China

Received date: 2015-04-14

  Online published: 2017-02-28

Abstract

Based on the routine observation data, Yinchuan doppler radar data, FY-2E satellite TBB data and the output of high resolution in temporal and spatial from WRF model, the paper analyzed and discussed a rainstorm process, which happened from 29 to 30 July 2012 ("7·29 rainstorm process" for short).The main results are as follows:(1) The development of rainstorm is closely related to upper-level jet at 200 hPa, short-wave trough at 500 hPa, the shear line at 700 hPa.(2) Eastward low vortex, warm-type shear line and low level jet (LLJ) are the main reasons of rainstorm.The low level jet (LLJ) came into being at 20:00 on 29 July, which maintained for about 7 hours.(3) Strong divergence at the right side of upper-level jet exit region, which occurred before the convergence in low level and maintained, is crucial for the formation and maintenance of obviously upward motion and low level jet.(4) The region of ΔNBE has a corresponding relationship with the rainfall region, which is large in convective precipitation stage, and quite small in stable precipitation stage because of the diferrent quasigeostrophic balance in two periods.(5) The water vapor transfer is mainly from the south wind of low level jet, which is corresponded to the formation and development of the LLJ.The variation of net water vapor transport is consistent with the feature of convective precipitation and stable precipitation.

Cite this article

WANG Hui , LONG Xiao , WEN Xiaopei , TIAN Feng , LIU Yanfei . Numerical Simulation Studies on "2012·7·29" Rainstorm Process in Ningxia[J]. Plateau Meteorology, 2017 , 36(1) : 268 -281 . DOI: 10.7522/j.issn.1000-0534.2016.00017

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