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The satellite-based water vapor stable isotope measurements have been widely used in modern hydrological and atmo-spheric studies.Their use is important for arid areas where the precipitation events are limited,and below-cloud evapora-tion is strong.This study presents the spatial and temporal characteristics of water vapor isotopologue across the Tianshan Mountains in arid central Asia using the NASA Aura Tropospheric Emission Spectrometer(TES).The near-surface water va-por stable isotopes are enriched in summer and depleted in winter,consistent with the seasonality of precipitation isotopes.From the surface to 200 hPa,the isotope values in water vapor show a decreasing trend as the atmospheric pressure de-creases and elevation rises.The vapor isotope values in the lower atmosphere in the southern basin of the Tianshan Moun-tains are usually higher than that in the northern basin,and the seasonal difference in vapor isotopes is slightly more signif-icant in the southern basin.In addition,bottom vapor isotopologue in summer shows a depletion trend from west to east,con-sistent with the rainout effect of the westerly moisture path in central Asia.The isotopic signature provided by the TES is helpful to understand the moisture transport and below-cloud processes influencing stable water isotopes in meteoric water.