Plateau Meteorology

Plateau Meteorology >

2016 , Vol. 35 >Issue 3: 561 - 573

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00020

Study about a Process of MCC Converting to MCV on Qinghai-Xizang Plateau

  • DING Zhiying ,
  • WANG Yijie ,
  • LIU Ruixiang
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  • Jiangsu Key Laboratory of Meteorological Disaster, Department of Atmospheric Sciences/Nanjing University of Information Science & Technology, Nanjing 210044, China

Received date: 2014-10-27

  Revised date: 2014-10-27

  Online published: 2016-06-28

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Abstract

With WRF(ARW)model and 3DVAR system,using ATOVS satellite data from the National Centers for Environmental Prediction as observation field,a direct assimilation test and numerical simulation is done about the conversion process of MCC to MCV on the Qinghai-Xizang Plateau in July 22-23,2013.First,do assimilation test with AMSUA,AMSUB and HIRS3 data,and test results showed that:different sensor data assimilation have different effects; multiple sensor data assimilation isn't better than a single data results; cycling assimilation effectively improve the strength and location of the simulated MCV.After cycling assimilation with AMSUB data,analysis on the process of MCV shows that mesoscale eddies and heavy rainfall occurred in wet isentropic surface subsidence area.Altitude positive MPV1 superimposed lower positive temperature,weakened convective instability,induced cyclonic circulation,making the development of cyclonic vorticity and precipitation.And the latent heat of condensation of water vapor further exacerbated wet isentropic tilt,making vertical vorticity further development.Meanwhile,by the influence of water vapor in the process of heating,the gradient of equivalent potential temperature weakened,and baroclinic term also declined,so the total MPV increases.In addition,the comparison results of the differences between east and plateau MCV showed that the latter had larger vorticity in low-layer due to the heating effect of the Qinghai-Xizang Plateau.

Key words： The Qinghai-Xizang P; MCC; MCV; Satellite data assim; Numerical simulation

Cite this article

DING Zhiying , WANG Yijie , LIU Ruixiang . Study about a Process of MCC Converting to MCV on Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2016 , 35(3) : 561 -573 . DOI: 10.7522/j.issn.1000-0534.2016.00020

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