Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 3: 702 - 720

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00054

The Characteristic Analysis of an Eastwards Plateau Vortex by Its Strengthening Process

  • YANG Yingcan ,
  • LI Yueqing ,
  • CHEN Yongren
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  • Chinese Academy of Meteorological Sciences, Beijing 100081, China;Institute of Plateau Meteorology, China Meterological Administration Chengdu 610072, Sichuan, China;Sichuan Meteorological Observatory, Chengdu 610072, Sichuan, China

Received date: 2017-02-08

  Online published: 2018-06-28

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Abstract

A present understanding of Plateau Vortex (PV) is regarded as a shallow vortex. However, some studies have pointed out that PV is not always a shallow system. A case of PV with a vertical thickness greater than 500 hPa were analyzed using the NCAR/NCEP reanalysis data, the conventional observations as well as the TBB data from FY-2E, and we discussed the relationship between the deep plateau vortex and the upper circulation. The results show:(1) In the developing stage, the convergence of vortex is weak while the downdrafts are strong, convergence is not the reason for the development of the deep plateau vortex which extended to the upper troposphere. The downdrafts of the high potential vorticity and high momentum form the upper air transported by the upper-level jet stream which in the north and east of the South Asian High(SAH) led to the generation and development of vortex. The evolution of the deep plateau vortex is related to SAH. Therefore, the eastern ridge of the SAH moved to the north and a "northeast-southwest" pattern was formed, the northeast flow of southeast SAH led the deep plateau vortex to the west. (2) The shallow PV has a warm character in thermal structure with a warm core at 500 hPa. The deep vortex has stratification in thermal structure and complex variety in time and space, Besides, it has a warmer structure as same as the SAH at 250 hPa and a colder structure below 250 hPa, the changes of the cold part of the vortex vary from height in different stages. (3) Comparing the dynamic characters between deep and shallow vortices in various stages, we found the deep PV has a stronger convergence and ascending motion in the early than the shallow PV which dominated by the subsidence movement. During the dissipation stage, horizontal vorticity advection is the main factor which causes the deep PV become weaker. On the other hand, the vertical vorticity conversion to the horizontal is the main reason for the decrease of the shallow PV.

Key words： Vertical thickness; Plateau Vortex; upper circulation

Cite this article

YANG Yingcan , LI Yueqing , CHEN Yongren . The Characteristic Analysis of an Eastwards Plateau Vortex by Its Strengthening Process[J]. Plateau Meteorology, 2018 , 37(3) : 702 -720 . DOI: 10.7522/j.issn.1000-0534.2017.00054

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