LONG-TERM VARIABILITY OF THE HYDRO-METEOROLOGICAL PARAMETERS IN THE CASPIAN SEA. PART 1: DATA DESCRIPTION
Abstract
NSEP/NCAR reanalysis data for the period of 1948–2017 were used for description of the long-term variability of the hydro-meteorological parameters in the Caspian Sea (surface air temperature, sea surface temperature, wind, relative and specific humidity, precipitation rate, precipitable water). Linear trends and polynomial approximations of these parameters are presented. The latter show the nonlinear nature and periodicity of the parameters’ variability. Three time spans of 10–25 years duration with multidirectional trends of hydrometeorological parameters have been identified. The switch of wind regimes occurred 10–12 years earlier than the change of thermal and humidity regimes, which suggests the leading role of the long-term variations of the large-scale atmospheric forcing in the variability of hydrometeorological parameters in the Caspian Sea.
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