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  2015, Vol. 34 Issue (2): 357-367    DOI: 10.7522/j.issn.1000-0534.2013.00176
    
Analysis on the Frontogenesis Mechanism of Dian-Qian Quasi-stationary Front Inducing Spring Rainstorm in Guizhou Province
DU Zhengjing1,2, HE Yulong3, XIONG Fang4, DENG Xiaohong1, SHI Kaiyin1, PENG Qian5
1. Guizhou Province Meteorological Service Center, Guiyang 550002, China;
2. Guizhou Key Laboratory of Mountounious Climate and Resources, Guiyang 550002, China;
3. Meteorological Bereau of South Guizhou, Duyun 555800, China;
4. Guizhou Meteorological Bureau, Guiyang 550002, China;
5. Guiyang Meteorological Bureau, Guiyang 550002, China
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Abstract  Using satellite images, observational data and the 6-hour-inteval reanalysis data with 1°×1° resolution from NCEP, five spring rainstorm processes in Guizhou Province under the background of Dian-Qian quasi-stationary front from 2003 to 2006 are analysed. The results show: In the setting of quasi-stationary front, the spring rainstorm in Guizhou Province is impacted together with the upper and low jet stream, upper trough, cold air and the quasi-stationary front. The rich water vapor is transported from the Bay of Bengal and Beibu Gulf to Guizhou province by low level jet stream, and the convective available potential energy is accumulated continuously. The acceleration of high jet stream strengthens the large-scale ascending motion with divergence in high level and convergence in low level, and drives the cold air southward via the positive circulation below the jet stream, then makes the quasi-stationary front active and frontogenesis, which is the trigger mechanism of the rainstorm processes. The frontogenesis phenomenon shows that the acceleration of high level jet stream results in the frontogenesis in the polar front in the mid-upper troposphere and the formation of the positive circulation in the middle troposphere. The latter strengthens the horizontal deformation and vertical motion and then enhances the frontogenesis. The horizontal deformation and vertical motion impact the rainstorm directly: The range of the horizontal deformation is in proportion to the rainfall intensity, and the convective cloud generating near the quasi-stationary moves along the direction of the inclined item related to vertical motion. Quasi-stationary front is close to spring rainstorm in Guizhou province. The heavy rainfall area is distributed mainly southward one latitude zone from the quasi-stationary front. The acceleration of high jet stream, the intensity of the moisture convergence around the cold front and the region of high-energy tongue have an indicative function to the extent and intensity of heavy rainfall. Based on above frontogenesis mechanism, a physical model about spring rainstorm in Guizhou province induced by the quasi-stationary front is epurated.
Key words:  Dian-Qian quasi-stationary front      Spring rainstorm      Frontogenesis mechanism      Physical model     
Received:  20 May 2013      Published:  24 April 2015
P458.2+21.1  

Cite this article: 

DU Zhengjing, HE Yulong, XIONG Fang, DENG Xiaohong, SHI Kaiyin, PENG Qian. Analysis on the Frontogenesis Mechanism of Dian-Qian Quasi-stationary Front Inducing Spring Rainstorm in Guizhou Province. , 2015, 34(2): 357-367.

URL: 

http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2013.00176     OR     http://www.gyqx.ac.cn/EN/Y2015/V34/I2/357

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