| 天津地区三次低涡暴雨过程的诊断分析 |
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| 引用本文：王万筠，殷海涛，窦策伟，等..天津地区三次低涡暴雨过程的诊断分析[J].气象与环境科学,2019,42(3):42-50.Wang Wanjun,Yin Haitao,Dou Cewei,et al.Diagnostic Analysis of Three Heavy Rainfall Processes With Vortex in Tianjin[J].Meteorological and Environmental Sciences,2019,42(3):42-50. |
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| DOI：doi:10.16765/j.cnki.1673-7148.2019.03.006 |
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| 中文摘要:天津地区三次低涡暴雨过程的诊断分析 |
| 中文关键词:暴雨 湿位涡 倾斜涡度 |
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| Diagnostic Analysis of Three Heavy Rainfall Processes With Vortex in Tianjin |
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| Abstract:Based on the conventional ground observational data and NCEP reanalysis data(1°×1°), 3 heavy rainfall processes in Tianjin in 2016, 2010 and 2011 were chosen, the synoptic background and water vapor conditions of the 3 processes were analyzed, and the 3 heavy rainfall processes were diagnostic analyzed using the theory of moist potential vorticity. The results showed: the 3 rainstorm processes occurred in a typical circulation pattern of east high west low, low altitude vortex is one of the main influencing systems. There were upper and lower jet in the 3 rainfalls, but the positions of jet were different. The difference of the dynamic structure and water vapor conditions of the vortex corresponded to the intensity of precipitation in varying degrees. The stronger intensity of the positive vorticity region and the longer duration indicated the greater precipitation intensity.The divergence of water vapor flux in 2016 was obviously stronger than that of the other 2 processes, which matched the precipitation intensity. Temporal and spatial evolution of moist potential vorticity corresponded well to the occurrence and development of heavy rainfall. The sharp increase of instability energy above Tianjin signed by negative area of MPV1, the negative area appeared in advance 3 h to 6 h before the rainfall, and it predicted the occurrence of heavy rainfall in Tianjin. Positive area of MPV1 corresponded to the region of heavy rainfall.There were the sharp increases of MPV2 before these 3 processes of rainfall.Negative value increase of MPV2 indicated greatly enhances of the baroclinic, and it was favorable to the development of cyclone vorticity. The sharp increases of MPV2 value was basically synchronized with the occurrence of precipitation. |
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