An estimation of troposphere corrections of GPS measurements at sites near the Baikal rift system

The troposphere zenith total delay (ZTD) determined from GPS measurements is an important parameter of the atmosphere. This delay is determined by a coefficient of the troposphere refraction [1]. In the report we consider data of the permanent ULAZ and IRKT GPS stations from 1999 up to nowadays. Utilizing the method of exact estimation of ZTD, the use of it for atmospheric and climatologic applications is possible. The ZTD and surface pressure series at ULAZ and IRKT points in winter period reveal a consistent variation pattern between ZTD and surface pressure, and indicate a connection between GPS ZTD and atmospheric processes.