Title: Numerical Simulation and Diagnostic Analysis of a Heavy Rainfall in Fujian during 6—7 June 2006
Abstract: A heavy rainfall process during 6—7 June 2006 in the Fujian area is simulated by the fine-meshed WRF mesoscale numerical model developed by multi-agency of USA,and a concept model is also constructed.The analysis of the output data indicates that the mesoscale low-vortex was one of the dominant systems in the process and its spatial and temporal evolution characteristics were in accord with the movement and rainfall rate of precipitation center.The disposition of the intensive ascending motion at the center of the rainstorm,and the upper-level divergence over the lower-level convergence were very conducive to the generation and development of mesoscale convective systems.The 850 hPa θse appears a typical Ω pattern,where high moisture and energy kept the rainfall maintaining and strengthening.The non-homogeneous convergence field located along the low-level shear line,and the center of the rainfall was adjacent to the maximum vertical velocity.There existed vertical secondary circulations in the two sides of the rainstorm area,suggesting that the interaction of the LLJ and ULJ was the important mechanism of the outbreak of the heavy rain.Besides,the positive moist potential vorticity(MPV) in the upper troposphere aloft the negative MPV in the lower troposphere was also conducive to the generation of strong mesoscale ascending motion.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 1
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