The Qinghai-Tibetan Plateau (QTP), which is aptly called as the "Asian water tower", acknowledged as the water source of the rest region in China, may profoundly have an significant impact on the regional and global atmospheric water vapor cycle, climate change and incidents of drought, disastrous weather and climate evolution in China and of the world, as a whole. In this paper, combined with the reanalysis data of ERA-Interim, MERRA2 (second Modern-Era Retrospective analysis for Research and Applications), JRA-55 (Japanese 55-year Reanalysis), and the GLDAS-2.0 (Global Land surface Data Asimilation System), the precipitation and temperature daily grid data from CMA (China Meteorological Administration) were used to investigate the characteristics of spacial distribution and variation tendency of precipitation, temperature, atmospheric water vapor, and the atmospheric water vapor transport in summer over the QTP in summer during the period of 1979-2010 in this study. The results showed that the surface temperature over the QTP had increasing trend while the precipitation showed a decreasing trend during the period of 1979-1998. Otherwise, during the period of global warming deceleration (1999-2010), the surface temperature and the precipitation showed a more significant increasing trend than those during the period of 1979-1998. The atmospheric water vapor over the QTP showed an increasing trend during the period of 1979-2010. On the contrary, based on the further analysis, the inward transport of atmospheric water vapor showed a decreasing trend year by year. Especially, after the year of 1998, due to the sharp weakening of the intensity of southwest monsoon, the net inward atmospheric water vapor transport was reduced more significantly in this period. The results indicated that the surface evapotranspiration over the plateau showed an increasing trend significantly, which may be a major cause of the increased atmospheric water vapor over the QTP.
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