The Case Study in Causes and Environmental Fields Analysis of Departure Plateau Vortex Accompanying with Induced Southwest Vortex

  • GAO Wenliang ,
  • YU Shuhua
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  • Institute of Plateau Meteorology, China Meterological Administatration, Chengdu 610072, Sichuan, China;The Plateau and Sichuan Basin Storm Rain and Dry Damage Key Laboratory of Sichuan Province, Chengdu 610072, Sichuan, China;Ya'an Meteorology Service, Ya'an 625000, Sichuan, China

Received date: 2016-12-05

  Online published: 2018-02-28

Abstract

By using NCEP/NCAR FNL reanalysis data, historical weather graphs and Qinghai-Tibetan Plateau and shear line year books, the observational facts of sustained departure Qinghai-Tibetan Plateau Vortex (SDPV) accompanying with influenced Southwest Vortex (SWV) during year 1998 to 2013 were analyzed, and a long time lasting case study of SDPV with induced SWV was analyzed by using synoptic and diagnostic methods.The results show that the SDPV and SWV moving in same direction is mainly caused by the SWV, which is induced and controlled by SDPV, and their main moving direction is east or north-east in the joint active processes of them.The SWV induced by SDPV generated under the south-west air flow in the southeastern portion of the SDPV circulation on 500 hPa, with weaker air flow along longitude side.The SWV accompanying with the SDPV will be stronger while the SDPV is stronger and be influenced largely by the SDPV.When SDPV is moving out of the Plateau, the positive vorticity air flow is downward to lower level and to be superposition with the low troposphere positive vorticity region which is going with cyclonic bend, and this will strengthen the cyclonic vorticity and thus generates the SWV.The force rising effect of the positive vorticity advection along with the altitude over the southwest vortex area is another important factor of the SWV induced by the SDPV.The accompanying between SDPV and SWV is closely related to the plateau vortex area, the positive vorticity advection of the southwest vortex area and the plateau vortex area, and the positive vorticity advection along the basin vortex area.

Cite this article

GAO Wenliang , YU Shuhua . The Case Study in Causes and Environmental Fields Analysis of Departure Plateau Vortex Accompanying with Induced Southwest Vortex[J]. Plateau Meteorology, 2018 , 37(1) : 54 -67 . DOI: 10.7522/j.issn.1000-0534.2017.00020

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