Abstract: Based on the monthly meteorological data of the upper air from 1976 to 2005, we analyzed the statistical relationship between land surface vapor pressure and atmospheric water vapor content and built a ground-based atmospheric water vapor content climatology model. Combined with ground meteorological data, actual surface vapor pressure of different stations was calculated in Longitudinal Range-gorge Region. Then, an ANUSPLIN climate interpolation model was used for the spatial interpolation of surface water vapor pressure, to make a grid of land surface vapor pressure. At last, the gridded land surface vapor pressure data was inputted into the climatology model to simulate the spatial pattern of land surface atmospheric water vapor content and realize the spatial simulation of the atmospheric water vapor content. The spatial distribution and its main causes of land surface water vapor pressure and atmospheric water vapor content were discussed. The results showed that longitudinal mountains have a significant barrier function to the vertical transport of water vapor, which leads to the horizontal differences of the surface water vapor pressure and atmospheric water vapor content. Deep north-south valley is an important corridor for the transportation of water vapor transmission. The "corridor-barrier" function of this region forms the special spatial pattern of the atmospheric water vapor content.

Key words: “Corridor-Barrier” function, atmospheric water vapor content, climatology model, land surface vapor pressure, Longitudinal Range-gorge Region