The application of reanalysis data to identify plateau vortex over the Qinghai-Xizang Plateau using NCEP/NCAR reanalysis data in 2009 is discussed. Based on geopotential height field and wind field, the plateau vortex recognition standard is defined by requirements including closing vortex, acreage, continuity, location, vertical structure and cyclonic shear. The plateau vortex objective identifying method is discussed using the knowledge of meteorology and computational-geometry. A new intensity index of the plateau vortex is defined as the difference between the minimum geopotential height of the central plateau vortex and the average geopotential height of the environment flow of plateau vortex. The maximum motion distance and minimum vector difference between environment flow vector and plateau vortex motion vector are combined to join the plateau vortex continuous motion tracks. 53 plateau vortexes are identified in all. The features of initial location, seasonal distribution, intensity, life period, and motion tracks of plateau vortex are analyzed using the recognition dataset. The objective identifying (OI) result is compared with the dataset of ‘The Yearbook of Plateau Vortex and Shear Lines in 2009’(YB). The comparison shows that OI′s plateau vortex track is consistent with YB′s except April and October which are the switching seasons; Part of the plateau vortex positions has major differences?more than 10 longitude/latitude. The OI′s plateau vortexgenesis location is more western than the YB′s, and the OI's plateau vortex track shows more meticulous details than the YB′s. The objective identifying method can analyze the plateau vortex activity objectively and quantitatively and also can reduce the burden for the plateau vortex analysis work from the artificial reading weather maps work of analyzing plateau vortex.
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