ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Comparison Analysis of the Circulation Characteristics of Plateau Vortex Moving out of and not out of the Plateau
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Abstract:
Using the NCEP reanalysis data, based on the comparison analysis, the general circulation and impacting systems of plateau vortex moving out of the plateau or not in summer from 2000 to 2004 are analyzed. The research indicates that at 500 hPa level, the circulation background of the plateau vortex moving out of the plateau abbreviated as PV (out), including the trough in the Balkhash Lake, East Asian major trough and high pressure ridge at Mongolia is stronger compared to the circulation background of plateau vortex moving not out of the plateau abbreviated as PV (not out), that is, the circulation background of PV (out) has the meridional circulation increased. And the Pacific subtropical high westward extension is significant in the circulation background of PV (out) compared with PV (not out). In the middle troposphere the warm advection is very important to the generation of the plateau vortex and vortex is apt to move eastward when there is a cold advection in Xinjiang. On the Tibeten Plateau, the positive vorticity advection in the middle troposphere is very important to the generation of the plateau vortex. The positive vorticity advection of PV (out) is weaker compared with it of PV (not out), and the vortex is apt to move eastward when there is a positive vorticity advection in Ordos Region. In the upper troposphere, the existence of South Asia high is beneficial to the generation of plateau vortex, and over PV (out), the strength of South Asia high is stronger than it of PV (not out).And when northeastern part of the Tibetan Plateau, the Sichuan Basin, Shanxi Province are located in the south side of the entrance of the upper jet stream, it is beneficial to plateau vortex to move eastward. Analysis of the similarities and differences between PV (out) and PV (not out) in the general circulation,the temperature advection and the vorticity advection could put forward the scientific basis to the prediction of PV(out) and PV (not out).
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