Sensitivity of water vapor vertical shape in GNSS atmospheric observation

This study examined the impact of the vertical shapes of water vapour on GNSS atmospheric observations. The standard model used in GNSS measurements to represent the vertical distribution of water vapour is a natural logarithm function based on the water vapour scale height. This model is effective in describing the variation of vertical structure of water vapour below the water vapour scale height (similar to the atmospheric boundary layer). However, in very humid conditions, it is important to measure water vapour above the water vapour scale height to predict whether a heavy rain system will persist. The presentation will discuss the characteristics of the vertical structure and an improved model for these structures.