国家重点研发计划项目 2018YFC1507200，国家自然科学基金项目 41675057、41765003、41675042
Based on atmospheric motion equations and a divergence equation, in this paper, we analyze and discuss the stability of the disturbance in the dynamic mechanism of the Tibetan Plateau vortex (TPV) induced by the transverse shear line (TSL) over the Tibetan Plateau (TP), which we then verify using ERA-interim reanalysis data. Based on our results, we conclude that the TSL is an important background field of the TPV. The TPV is induced by the transport of water vapor located south of the TSL and is associated with the adjustment of the divergence field caused by an imbalance in the atmosphere. This is favorable for the formation of a TPV in which the convergence is enhanced, with the center of the TPV corresponding to the positive center of the unbalanced aspects and the periphery of the TPV with the negative area of the imbalanced aspects. The area with a large negative value of unbalanced aspects coincides with vapor convergence, which can indicate the location of precipitation. When the southwest winds increase and move toward the east or northeast, or when there is a negative center area of unbalanced aspects downstream of the TPV, the vortex moves in the same direction. If there is a cyclonic circulation in the TP and the center of the cyclonic circulation corresponds to the positive center of the unbalanced aspects, this is conducive to the formation of the TPV. Furthermore, when the center of the vortex corresponds to the positive center of the unbalanced aspects, and this value continuously increases, this is also favorable for the development of the TPV.
杜梅,李国平,李山山.高原横切变线与高原低涡关系的初步研究.大气科学,2020,44(2):269~281 DU Mei, LI Guoping,LI Shanshan.A Preliminary Study of the Relationship between the Plateau Transverse Shear Line and Plateau Vortex.Chinese Journal of Atmospheric Sciences (in Chinese),2020,44(2):269~281复制