A study on real-time spatio-temporal variations of precipitable water vapor with a dense GNSS receiver network

摘要

We have employed the GNSS meteorology method to measure the PWV (Precipitable Water Vapor), which is the integrated amount of water vapor along the zenith angle. We will try to establish the real-time prediction technique of the local torrential rain,utilizing the time and spatial variations of PWV within a small range in advance to the rainfall. We deployed the hyper-dense GNSS receiver networks around Uji and Shigarki with inter-station distances of few kilometers. We observed the PWV fluctuations occurred within a small horizontal scale, then we studied a relation between the PWV increase and rainfalls.