Plateau Meteorology

Plateau Meteorology >

2016 , Vol. 35 >Issue 1: 64 - 76

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00150

Comparative Analysis of Persistent Heavy Rainfall Events in West and East Sichuan Basin

  • LI Juan ,
  • SUN Jianhua ,
  • ZHANG Yuanchun ,
  • SHEN Xinyong
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  • Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Received date: 2014-05-04

  Online published: 2016-02-28

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Abstract

Based on the conventional observation data,reanalysis data from NCEP/NCAR,satellite data and so on,the characteristics of circulation background,source of cold air and water vapor,convective systems over the Qinghai-Xizang Plateau and southwest vortex are analyzed on the two persistent heavy rainfall in western Sichuan basin and eastern Sichuan basin.The results show that in the western basin event,the location of high-level jet on 200 hPa was norther,the subtropical high was northeaster,the westerly trough and southwest vortex were westerner than the eastern basin event;cold air in the middle troposphere came from central Asia and western edge of the Qinghai-Xizang Plateau,water vapor in low level was transported by southwest airflow from the bay of Bengal in the western basin event;cold air came from mid-latitude at the early stage of event,while during the later period,the westerly flow in the middle troposphere mainly came from Bengal and southern Qinghai-Xizang Plateau,water vapor in low level was transported by southeast airflow that from South China Sea in the eastern basin event.The convective activities in western Sichuan plateau and basin have significant diurnal variation:from the afternoon to early evening in western Sichuan plateau,from the late evening to the next early morning in Sichuan basin,the difference is the eastward propagation of convective system from the edge of the Qinghai-Xizang Plateau merged with the clusters over western basin in the western basin event,but for the eastern basin event,convective system weakened as it moved eastward,there was no merging process.

Key words： Persistent heavy rai; Multi-scale characte; Moisture transportat; Convection over Qing; Southwest vortex

Cite this article

LI Juan , SUN Jianhua , ZHANG Yuanchun , SHEN Xinyong . Comparative Analysis of Persistent Heavy Rainfall Events in West and East Sichuan Basin[J]. Plateau Meteorology, 2016 , 35(1) : 64 -76 . DOI: 10.7522/j.issn.1000-0534.2014.00150

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