MULTIYEAR TRENDS IN THE TOTAL MOISTURE CONTENT OF THE TROPOSPHERE IN DIFFERENT-LATITUDE ZONES OF EASTERN SIBERIA

GPS measurements are an important tool for navigation and high-precision space geodesy. Of particular importance is the use of the GPS data for determining integrated water vapor (IWV) level within the lower neutral part of the atmosphere. Radiosonde (RS) data are also important for direct determination of the integrated water vapor. The values of the weighted mean temperature (T_m) in a vertical column are found from radiosonde launches in order to extract IWV values from GPS-derived total zenith tropospheric delay (ZTD) estimates. The total moisture content variability from 1999 to 2021 is considered based on the datasets of permanent GPS measurements, radiosondes and surface meteorology at IRKT (Irkutsk), YAKT (Yakutsk) and TIXI (Tiksi) observation points located in different-latitude zones.

The RS- and GPS-derived trends in moisture content were compared with the surface meteorological data-based model calculations. GPS measurements showed a good agreement with model calculations rather than with RS data. The tropospheric integrated water vapor tends to increase over the entire GPS observation period, and, despite a large latitudinal difference between the three observation points, there is a consolidated tendency at the level of 0.33±0.04 mm per decade.

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