WEI Jing-jing,LI Guo-ping.Characteristic of Moist Potential Vorticity and Second Order Moist Potential Vorticity of Heavy Rainfall over Guangxi Cause by Southwest Vortex of Southeast Path[J].Journal of Chengdu University of Information Technology,2016,(06):592-598.
一次东南路径西南低涡引发广西强降水的 湿位涡和二阶湿位涡特征
- Title:
- Characteristic of Moist Potential Vorticity and Second Order Moist Potential Vorticity of Heavy Rainfall over Guangxi Cause by Southwest Vortex of Southeast Path
- 文章编号:
- 2096-1618(2016)06-0592-07
- Keywords:
- meteorology; weather dynamics; Southwest Vortex; heavy rainfall over Guangxi; moist potential vorticity; second order moist potential vorticity; conditional symmetric instability
- 分类号:
- P458.1+21
- 文献标志码:
- A
- 摘要:
- 为加深对西南低涡的移动规律的认识及为降水落区预报提供参考,利用NCEP/NCAR再分析资料、中国自动气象站与CMORPH降水产品融合的降水资料,应用位涡动力学等理论对2008年6月11～13日一次西南低涡引发的广西强降水进行诊断分析。结果表明:西南低涡生成于四川南部(700 hPa),其在高原低槽引导下东南移动进入广西,降水主要发生在西南低涡的中东部。强降水的发生发展和湿位涡(MPV)的时空演变有很好的对应关系,强降水区位于对流层低层正压分量MPV1的正负值交界区和斜压分量MPV2的负值区。二阶湿位涡对降水落区有一定的指示作用,当湿位涡梯度增大到一定程度时,二阶湿位涡的水平分布与6h后降水落区分布有较好的对应关系。条件对称不稳定是本次强降水发展增强的一种可能机制。
- Abstract:
- In order to deepen the understanding of the movement law of the southwest vortex and provide reference for the precipitation region forecast, weusethe NCEP global 1°*1° final-analysis data and rainfall data fused by Chinese automatic weather station and precipitation products,and apply thevorticity dynamics conditionto analyzetheheavy precipitationin Guangxi procincecaused by the southwest vortex during June 11th to 13th of the year 2008.The results show that the southeast vortex(700 hPa)was generated in the south of Sichuan, and then moved to the southeast guided by Plateau trough and arrived in Guangxi, and precipitation mainly took place in central and eastern of the southeast vortex. There is a good corresponding relationship between the occurrence and development of heavy precipitation and spatial and temporal changes of moist potential vorticity.In heavy precipitation phase, the heavy precipitation area was located at positive and negative value border regions of barotropic component(MPV1)and negative value regions of baroclinic component(MPV2)in lower troposphere. The second order moist potential vorticity is a good forecast utility to the precipitation area, when moist potential vorticity gradient increases to a certain degree, the horizontal distribution of the second order moist potential vorticity has a better positive correlation to the area and intensity of next 6 h precipitation. Conditional Symmetric Instability is a possible mechanism of enhancing development of this heavy precipitation.
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备注/Memo
收稿日期:2016-04-11 资助项目:国家重点基础研究发展计划(973计划)资助项目(2012CB417202); 财政部、科技部公益性行业(气象)科研专项资助项目(GYHY201206042); 国家自然科学基金资助项目(91337215)