ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Numerical Simulation and Diagnostic Analysis of a Heavy Snow Process
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Abstract:
MM5 model is used to simulate the process of snowstorm in Henan Province from Ja nuary 18th to 19th in 2006. High spacetime resolution data from mo del output are imposed to analyze vapor，temperature，instability，wind and othe r conditions of this process．Results show that the convergence of middlelow l ayer vapor is absolutely necessary condition．It is most favorable for snowstorm that upper boundary of inversion layer over Henan Province corresponds to sout hwest jet flow and lower boundary corresponds to northeast jet flow．The stead y maintaining of highlow jet flow generated two separate secondary circumfluence and the n orth of indirect circumfluence formd convergence ascending air at the exit of up perlevel jet flow．This situation quite favor the generation and development of precipitation．Total helicity changes have th e significant indication to changes of snow intensity．Moist potential vorticity was analyzed to find that MPV2 is more important than MPV1 in this event, where as in the case of rainstorm, MPV1 plays a dominant role．
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