YIN Fei,WANG Lei,LI Xiehui.Analysis of Q Vector and Moist Potential Vortex in a Rainstorm Process in Sichuan[J].Journal of Chengdu University of Information Technology,2020,35(04):479-486.[doi:10.16836/j.cnki.jcuit.2020.04.018]
一次四川暴雨过程的Q矢量和湿位涡分析研究
- Title:
- Analysis of Q Vector and Moist Potential Vortex in a Rainstorm Process in Sichuan
- 文章编号:
- 2096-1618(2020)04-0479-08
- Keywords:
- atmospheric dynamics; diagnostic analysis; rainstorm; Q vector; moist potential vortex; Sichuan
- 分类号:
- P458.3
- 文献标志码:
- A
- 摘要:
- 针对四川省的暴雨灾害,为给此后同种类型的暴雨预报提供一定的参考意义,结合大气动力学的Q矢量和湿位涡的诊断方法,利用NECP再分析资料和国家气象自动站降水资料,对2018年7月2日四川省一次暴雨天气过程的进行了分析研究。结果表明:700 hPa Q矢量散度辐合区与暴雨落区位置基本重合,辐合带移动和强度变化与强降水移动和强度变化一致。Q矢量散度高层的辐散气流向南北输送,下沉气流在低层堆积,形成了垂直方向的闭合环流有利于暴雨维持,垂直环流的位置与降水区对应。强降水主要位于在700 hPa湿位涡MPV1、MPV2项的正负值交界处,并且暴雨中心偏向MPV1负值区,对流层低层MPV1<0、MPV2>0的配置可作为降水落区的判断依据
- Abstract:
- In view of the heavy rain disaster in Sichuan Province, it will provide a certain reference significance for the same type of heavy rain forecast thereafter, the diagnosis method combiningQ vector and moist potential vortex in atmospheric dynamics, Using NECP reanalysis data and precipitation data from the National Meteorological Automatic Station, a heavy rain weather process in Sichuan Province on July 2, 2018 was analyzed and studied. The results show that the convergence of the 700 hPa Q vector divergence is basically coincident with the rainstorm area. The movement and intensity changes of the convergence zone are basically consistent with the movement and intensity changes of the storm zone. The divergent airflow of the Q vector divergence transferring to the north and south is piled up in the lower layer. Such a positive feedback mechanism is beneficial to the rainstorm maintenance. The position of the vertical circulation corresponds to the precipitation zone. The heavy rain is mainly located at the positive and negative values' intersection of the MPV1 and MPV2 of the 800 hPa moist potential vortex,and the rainstorm center is biased toward the negative value area of MPV1. The configuration of which MPV1 < 0 and MPV2 > 0 in the lower troposphere can be used as the basis for judging a rainfall area
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备注/Memo
收稿日期:2019-12-20
基金项目:国家自然科学基金面上资助项目(41275033),四川省科技厅软科学研究计划资助项目(2017ZR0043)