Plateau Meteorology

Plateau Meteorology >

2016 , Vol. 35 >Issue 3: 788 - 799

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00019

Structure Feature and Momentum Budget Analysis of a Gust Front in Shanghai Region

  • YUE Caijun ,
  • YUAN Zhaohong ,
  • TAO Lan ,
  • CHEN Guomin ,
  • DAI Jianhua ,
  • TAN Jianguo
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  • Shanghai Institute of Meteorological Science (Shanghai Satellite Remote-Sensing and Application Centre), Shanghai 200030, China;2. Shanghai Meteorological Service, Shanghai 200030, China;3. Shanghai Central Meteorological Observatory, Shanghai 200030, China;4. Shanghai Typhoon Institute of the China Meteorological Administration, Shanghai 200030, China

Received date: 2014-11-07

  Online published: 2016-06-28

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Abstract

There is a gust front occurred in Shanghai region during 13-14 on July 2012.Based on Doppler radar data,automatic weather station data and outputs from WRF model simulation,the structure feature of gust front was analyzed,and the cause of gust front translation speed was studied on the basis of the momentum budget method.The results are as follows:(1)The weather phenomena of gust front is obvious,such as pressure rising, wind direction inversing,wind speed increasing,temperature and dew-point temperature dropping and so on,along with instantaneous heavy rain.It is noted that above weather phenomena don't occur at the same weather station synchronously.(2)The evolution of gust front and its influence process on Shanghai are simulated successfully by WRF model.However,the moving speed of the simulated gust front is slower than that of the observation.( 3)There is a cold pool at the back of gust front,lying below 2 km,with negative perturbation pressure above cold pool.Meanwhile,perturbation west wind in the 2~3 km air cloumn downloads into cold pool.The intensity of cold pool affects the counterpart of gust front directly,and momentum with downloading wind not only drives cold pool directly but also affects the genesis of gust front and its intensity.(4)The analysis of momentum budget shows that vertical advection and pressure gradient force are the primary contributions to the zonal translation of gust front,which discloses the cause of gust front translation quantitatively.

Key words： Gust front; Momentum budget; WRF model; Cold pool

Cite this article

YUE Caijun , YUAN Zhaohong , TAO Lan , CHEN Guomin , DAI Jianhua , TAN Jianguo . Structure Feature and Momentum Budget Analysis of a Gust Front in Shanghai Region[J]. Plateau Meteorology, 2016 , 35(3) : 788 -799 . DOI: 10.7522/j.issn.1000-0534.2015.00019

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