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| Diagnostic Analyses of the Modified Convective Vorticity Vector in Non-uniformly Saturated Moist Flow |
| YANG Shuai,WANG Dong-Hai |
| Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences, Beijing 100081 |
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Abstract Because the real atmosphere is non-uniformly saturated, the generalized potential temperature is introduced. The convective vorticity vector, which can depict the occurrence and development of mesoscale deep convective systems, is modified and re-derived in a non-uniformly saturated moist atmosphere (C*). Then, a case study is performed for a frontal rainfall event which occurred near the middle and lower reaches of the Yangtze River in China. The diagnostic results of C* show that, in the lower troposphere, the vertical component of C* (C*z) can diagnose developments and movements of precipitation and convection better than those of Cm (Cmz, in saturated moist flow) and C (Cz, in dry flow). C*z is a good predictor for precipitation analyses as well.
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Received: 05 February 2009
Revised: 21 April 2009
Accepted: 21 April 2009
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