WU Qiuyue,HUA Wei,SHEN Hui,et al.Diagnostic Analysis of a Southwest Vortex Rainstormbased on Moist Potential Vorticity and Helicity[J].Journal of Chengdu University of Information Technology,2019,(01):63-71.[doi:10.16836/j.cnki.jcuit.2019.01.013]
基于湿位涡与螺旋度的一次西南低涡强降水分析
- Title:
- Diagnostic Analysis of a Southwest Vortex Rainstormbased on Moist Potential Vorticity and Helicity
- 文章编号:
- 2096-1618(2019)01-0063-09
- Keywords:
- meteorology; plateau meteorology; southwest vortex; rainstorm; moist potential vorticity; helicity
- 分类号:
- P458.1+21
- 文献标志码:
- A
- 摘要:
- 利用NCEP再分析资料、地面观测资料、FY-2E卫星TBB资料和融合降水资料,应用湿位涡和螺旋度原理,对2015年8月17-19日一次西南低涡强降水过程进行诊断分析,得出以下结论:水汽通量散度辐合区的分布对降雨落区有较好的指示性,中尺度对流云团特征与低涡和降水发展趋势有着密切联系。降雨落区及其中心位置与该时刻700 hPa湿位涡有较好的对应关系,降雨中心靠近MPV1负值与正值的交界处,而MPV1负值区内的降水较弱。对流层中低层MPV1负值与MPV2正值的重合区是强降水发生的警戒区,并且对流层中低层层结的不稳定、气流的辐合上升运动以及西南温湿气流的输送是此次强降水产生的重要机制。对流层中低层z-螺旋度正值区的分布对相应时段降水的落区具有较好的指示性,相对螺旋度正值区的大值中心位置与未来6 h降水中心的落区呈现出高度一致,且降水中心靠近相对螺旋度正值中心一侧的等值线密集区。
- Abstract:
- Using NCEP re-analysis data, the observation data, FY-2E TBB data and merged precipitation data, applying the theories of moist potential vorticity and helicity, a diagnostic analysis of a Southwest Vortex rainstorm process from 17 to 18 August 2015 was carried out. The results are as the following: the distribution of the convergence region of moisture flux divergence can be taken as a good indicator for rainfall area and the characteristics of mesoscale convective cloud clusters are closely related to the development of Southwest Vortex and precipitation. The spatial distribution of the 700 hPa moist potential vorticity has a good correspondence with rainfall area and its center location in the corresponding period. The strong rainfall center is near the junction of the negative value area and the positive value area of MPV1, while the rainfall in the negative value area of MPV1 is weak. The overlapping area of the negative value of MPV1 and the positive value of MPV2 in the mid-low troposphere is a warning area for the storm. Stratification instability, upward movement of intensive convergence and the transfer of southwest warm and humid air in the midlow tropo-sphere are important mechanisms for the generation of the rainstorm. The distribution of the positive value area of z-helicity can give good indication to rainfall area in the corresponding period. The center position of the positive value area of relative helicity is highly consistent with the next 6 h precipitation center, and the precipitation center is close to the densest isolines by the side of the positive value center of relative helicity.
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备注/Memo
收稿日期:2018-04-18基金项目:国家自然科学基金资助项目(41775072、91537214、41405069); 四川省教育厅重点资助项目(16ZA0203)