Title: The Numerical Simulation and Diagnostic Analysis of a Rainstorm Process in the Middle and Lower Reaches of the Yellow River
Abstract: Based on PSU /NCAR nonhydrostatic mesoscale model WRF V3. 2. 1 and its output data with high spatial and temporal resolution,the heavy rainfall process which occurred in the middle and lower reaches of the Yellow River from 29 to 30 July 2007 was simulated and analyzed. The results are as follows:( 1) The center of maximum values of generalized potential temperature was consistent with the area of relative humidity more than 90%. Over the rainstorm area,the funnelform isolines of generalized potential temperature sloped and extended from the middle and upper troposphere to the lower level,and the vertical gradient of generalized potential temperature increased accordingly under the bottom of the funnel,the storm center was located in the big gradient area of generalized potential temperature.( 2) In pressure coordinates,the vertical component( Cz) of convective vorticity vector was opposite to the rainfall with time evolution,and the extreme value of Czlagged the peak precipitation about an hour. The development of the vertical integration of Czwas corresponding to the rainfall area and the rainfall intensity change,which showed that it had some indication to the rainfall area and precipitation intensity.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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