Numerical Simulation and Diagnostic Analysis on a Rainstorm Event in Gansu

  • YANG Xianyu ,
  • WEN Jun ,
  • WANG Dayong ,
  • LI Jianglin
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  • Cold and Arid Regions Environmental Research Institute, Chinese Academy of Science, Lanzhou 730000, China;2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China;3. University of Chinese Academy of Science, Beijing 100049, China;4. Shanxi Climate Center, Taiyuan 030006, China

Received date: 2013-12-20

  Online published: 2016-06-28

Abstract

WRF model was used to numerical simulation and diagnostic analyze on a rainstorm occurred in Min county,Gansu Province on 10 May 2012.The results illustrate that:The WRF model is potential in simulating and predicting this precipitation process,including the rainfall area and intensity.This precipitation was fed by a southwesterly flow around Sichuan basin which carried warm and moist air from Bengal Bay,and the maximum value of water vapor flux was up to 16 kg·m-1·s-1·hPa-1.Before the rainstorm,the atmospheric energy was accumulated and stored.The energy was released at the beginning of the rainfall and dissipated by the end of the rainstorm.During this precipitation,the whole atmospheric layer was ascending,and the maximum value of vertical speed was up to 0.5 m·s-1.This ascending motion not only made the warm and moist air convergence but also released latent heat and heated atmosphere,hence a positive feedback was formed and the vertical movement was strengthen.The precipitation process can be explored through the simulation of the CAPE and radar reflectivity factor and other physic index from the WRF model.

Cite this article

YANG Xianyu , WEN Jun , WANG Dayong , LI Jianglin . Numerical Simulation and Diagnostic Analysis on a Rainstorm Event in Gansu[J]. Plateau Meteorology, 2016 , 35(3) : 726 -733 . DOI: 10.7522/j.issn.1000-0534.2015.00048

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