Effects of the Summer Heating over the Iranian Plateau and the Qinghai-Xizang Plateau on Precipitation over the Tarim Basin

Based on the JRA-55 surface sensible and latent heat flux， reanalysis circulation data provided by Japan Meteorological Agency （JMA）， monthly grid precipitation data provided by the National Meteorological Information Center （NMC） during the period of 1971 -2019.The effects of thermal anomalies over the Iran Plateau and the Qinghai-Xizang Plateau on summer precipitation over the Tarim Basin are analyzed.Results show that the sensible heat over the Iran Plateau and the latent heat over the Qinghai-Xizang Plateau play main roles in summer heating.The singular value decomposition （SVD） analysis has indicated that the surface thermal anomalies over the two plateaus are well related to summer precipitation over the Tarim Basin.Correlations suggest that thermal anomalies in the two plateaus have better relationships with summer precipitation over the Tarim Basin than one in single plateau.When the sensible heat strengthens over the Iran Plateau， and the latent heat strengthen in northern Qinghai-Xizang Plateau and weaken in southern Qinghai-Xizang Plateau， which can cause the middle to upper tropospheric cooling over central Asia.On the one hand， the subtropical westerly jet will shift south over central Asia， and there is an anomalous cyclone over central Asia and an anomalous anticyclone over Mongolian Plateau， which result in anomalous south wind prevailing over the Tarim Basin.On the other hand， the water vapor can be transport to the Tarim Basin by an anomalous anticyclone over the Arabian Sea and an anomalous cyclone over central Asia， meanwhile， the anomalous anticyclone over north China also can transport the water vapor from northwest Pacific to the Tarim Basin.Above both are contributed to more summer precipitation over the Tarim Basin.The single thermal anomalies over the Iran Plateau and the Qinghai-Xizang Plateau both can influence the summer precipitation over the Tarim Basin， but show partial difference related to the source and path of water vapor.The former only can affect water vapor transmission in the tropical Indian Ocean， but the latter can affect water vapor transmission in both the Indian Ocean and northwest Pacific.