Case studies on mesoscale structures of heavy rainfall system in the Yangtze River generated by Meiyu front |
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Authors: | Email author" target="_blank">Liping?LiuEmail author Zheng?Ruan Danyu?Qin |
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Institution: | 1. Chinese Academy of Meteorological Sciences, Beijing 100081, China 2. Nanjing Institute of Meteorology, Nanjing 210044, China |
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Abstract: | A heavy rainfall system was observed over the Yangtze River during Meiyu season by using dual-Doppler radar systems in the
field experiment conducted by the project of National Fundamental Research Planning “Research on formation mechanism and the
prediction theory of hazardous weather over China”. The three-dimensional mesoscale kinematic structure and process of a heavy
rain on 22 and 23 July, 2002 are investigated by using the radial velocity and dual-Doppler radar technique. The results show
that a southwest-northeast oriented rain band with the length of about 1000 km involves numbers of meso-β or meso-γ-scale
convective cells with the size of 20–50 km. The heavy rain band in the middle reaches of the Yangtze River exists in a low-level
wind shear. The interaction between southwest low-level jet on the southern side of wind shear and east wind on the northern
side formed the updraft. The wind disturbance, wind shear and convergence generate the convective action. The new cell developed
in right rear flank of rain band and moved to the southwest wind area, where the vapor is abundant. This kind of echo can
last a long time and developed well. The strong convective echoes are often accompanied by the meso-γ-scale vortex and convergence. |
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Keywords: | heavy rainfall in Meiyu front mesoscale structure dual-Doppler radar middle reaches of the Yangtze River low-level jet |
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