Study on a Mesoscale Convective Vortex Causing Heavy Rainfall during the Mei-yu Season in 2003 |
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| Authors: | SUN Jianhu ZHAO Sixiong XU Guangkuo and MENG Qingtao |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences 100084,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The strong heavy rainfall on 3--5 July 2003 causing the severe flooding in
Huaihe River basin (HRB), China is studied. It is noted that there are
sometimes mesoscale convective vortex (MCV) in East Asia during the mei-yu
season. Simulation results from the ARPS (Advanced Regional Prediction) data
analysis system (ADAS) and WRF model were used to study the development of
the mesoscale convective system (MCS) and mesoscale convective vortex (MCV).
It is confirmed that the MCV formed during the development of a previous
severe MCS. A closed vortex circulation can be found below 600 hPa with a
vorticity maximum in the middle troposphere. The evolution process of the
MCV can be divided into three stages: initiation, maturation, and
dissipation. During the mature stage of the MCV, a downdraft occurred in the
center of the MCV and new convection developed in southeast of the MCV. The
convergence and the tilting in the lower troposphere convergence and
vertical advection in the middle troposphere were the main vorticity sources
in the MCV initiation stage. Finally, a conceptual model between the mei-yu
front and the embedded MCS and MCV is proposed. The mei-yu front was the
background condition for the development of the MCS and MCV. A low level jet
(LLJ) transported moisture and the weak cold air invasion via a trough aloft
in the middle troposphere and triggering the severe convection. Furthermore,
the intensified jet was able to result in the initiation of new ``secondary"
areas of convection in the eastern part of the MCV. |
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| Keywords: | mesoscale convective system mesoscale convective vortex doppler radar WRF model |
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