To analyze the climate characteristics of Qinghai-Tibetan Plateau surface heat flux and plateau vortex, study the effects of surface heat flux on the vortex activity in the Qinghai-Tibetan Plateau, the spatial and temporal distribution characteristics of surface sensible heat flux, surface latent heat flux and plateau vortex were analyzed by using the ERA-Interim reanalysis data from 1986 to 2015 (four times a day). By means of correlation analysis and synthesis analysis, this paper selected the key area of the summer plateau vortex generation (30.75°N-36°N, 81°E-91.5°E), and discussed the possible connection between the surface sensible heat flux, surface latent heat flux and the frequency of plateau vortex generation. The result shows that:from the characteristics of time variability, in the last 30 years, there were 915 summer plateau vortex generated, with an average of 30.5 times a year, of which 697 were generated in the key area, accounting for 76.18% of the total, and the climate trend rate of it was -0.598 every 10 years, showing a significant downward trend. In the key area, the surface sensible heat flux generally declined, with an decrease rate of -0.704 W·m-2·(10a)-1, while the latent heat flux shows a weak upward trend, with an increase rate of 0.04 W·m-2·(10a)-1. From the perspective of spatial variability, the plateau vortex were mainly distributed in the northern of Tibet and the southwest of Qinghai, the key area corresponds to the larger value region of the surface sensible heat flux average and the smaller value region of the surface latent heat flux average. In summer, the frequency of plateau vortex is positively correlated with surface sensible heat flux and negatively correlated with surface latent heat flux in the west and north of the plateau (especially in the key area). The distribution of surface energy in the key area is obviously different in the years of more plateau vortex and less. When the surface sensible heat flux in the key area is stronger than the climate average, it is easier to produce plateau vortex; however, when the surface latent heat flux in the key area is stronger than the climate average, it is more difficult to produce plateau vortex, and vice versa. Therefore, both in time and space, the relation between the plateau vortex generating frequency was positively correlated with the surface sensible heat flux, and negatively correlated with the surface latent heat flux in summer.
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