A Modified Moist Ageostrophic Q Vector  

作　　者：岳彩军 寿绍文 

机构地区：[1]Shanghai Typhoon Institute, China Meteorological Administration [2]Laboratory of Typhoon Forecast Technique/China Meteorological Administration [3]School of Atmospheric Sciences, Nanjing University of Information Science and Technology

出　　处：《Advances in Atmospheric Sciences》2008年第6期1053-1061,共9页大气科学进展（英文版）

基　　金：National Natural Science Foundation of China (Grant Nos. 40405009, 40075009, 40205008);Shanghai Typhoon Research Funding (Grant No. 2003ST005);Shanghai Weather Bureau Research Funding (No. 04A06);Jiangsu Key Laboratory of Meteorological Disaster Fund- ing (No. KJS0602)

摘　　要：The quasi-geostrophic Q vector is an important rainfall associated with large-scale weather systems diagnostic tool for studying development of surface and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.The quasi-geostrophic Q vector is an important rainfall associated with large-scale weather systems diagnostic tool for studying development of surface and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.

关 键 词：moist ageostrophic Q vector MODIFICATION latent heating torrential rainfall associated with mei-yu front 

分 类 号：P426.6[天文地球—大气科学及气象学]