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The development of the Marine and Atmospheric Research System (MARS) for simulation of the Caspian Sea hydrometeorological characteristics is presented. It includes computation of the atmospheric forcing with the regional non-hydrostatic atmosphere model Weather Research and Forecasting model (WRF), as well as computation of currents, sea level, temperature, salinity and sea ice with the model of marine circulation INMOM (Institute of Numerical Mathematics Ocean Model) and the computation of wind wave parameters using the Russian wind-wave model (RWWM). The results on verification of the hydrometeorological characteristics of diagnosis and forecast computations with MARS are presented. Verification of the regional nonhydrostatic atmospheric model WRF was performed using data from coastal weather stations. Based on the results of retrospective computations, the quality of calculated meteorological characteristics was estimated taking into account its synoptic and seasonal variability. It was shown that an increase in spatial resolution of WRF model leads to an improvement in the reproduction of meteorological characteristics. Based on the results of the forecast computations, the quality of calculated meteorological characteristics was estimated according to forecast time. The verification of the INMOM model was carried out according to data from hydrological stations and also based on the results of computations of interannual variability of sea level. It is shown that changes made in MARS lead to a quality improvement in computation results. Thus, new version of MARS allows to reproduce seasonal and interannual changes of the Caspian sea level and can be used both for diagnoze and forecast computations of hydrological and meteorological characteristics.

APPROVAL OF THE OPERATIONAL DIAGNOSE AND FORECASTING SYSTEM OF HYDROMETEOROLOGICAL CHARACTERISTICS FOR CASPIAN SEA