一次暴雨的湿位涡及条件性对称不稳定分析
林确略;刘金裕;彭武坚
【期刊名称】《安徽农业科学》 【年(卷),期】2011(039)027
【摘要】[Objective ] The research aimed to analyze the moist potential vorticity and conditional symmetric instability of a rainstorm in Cuangxi in the prior flood season. [ Method ] Based on the conventional observation data, precipitation data from the automatic station and 1 ° xl° six-hourly reanalyzed data from NCEP, the moist potential vorticity (MPV) and conditional symmetric instability (CSI) in a rainstorm process which occurred in the prior flood season in Guangxi were analyzed. The characteristics of MPV component and role of CSI on rainstorm before and after the rainstorm occurrence were discussed. [ Result] The dense belt of isoline in the southeast of MPV 1-positive area (MPV2 negative area) at 925 hPa, the underneath of sloping MPV1-positive pillar (MPV2-negative pillar) on the profile map and the underneath of dense belt of 8e isoline had the good corresponding relationships with the falling zone of strong precipitation. After the system developed strong ly , the enhancements of gradient and intensity of MPV1 and MPV2 predicted the rainstorm increasing. In the beginning period of strong precip itation occurrence, the convective instability at 850 - 650 hPa co-existed with CSI. The convective instability and vertical movement played the
一次暴雨的湿位涡及条件性对称不稳定分析
