安徽农业科学2011，Vol.39Issue(27)：16878-16881,4.
一次暴雨的湿位涡及条件性对称不稳定分析
Analysis on the Moist Potential Vorticity and Conditional Symmetric Instability of a Rainstorm
摘要
Abstract
[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 main role. In the middle and latter periods of strong precipitation, the high-altitude weak cold air further invaded southward. It triggered the release of unstable energy and compelled that the prior slantwise 8e dense belt became steep. It was favorable for the development of sloping vorticity, and the atmosphere gradually turned into the neutral state of convection. CSI and ramp motion played the major role. Then, the rain storm continued. [ Conclusion ] The research provided the theory basis for the application of MPV and CSI into the local routine business.关键词
暴雨/湿位涡/条件性对称不稳定Key words
Rainstorm/ Moist potential vorticity/ Conditional symmetric instability分类
天文与地球科学引用本文复制引用
林确略,刘金裕,彭武坚..一次暴雨的湿位涡及条件性对称不稳定分析[J].安徽农业科学,2011,39(27):16878-16881,4.
