ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2012, Vol. 9, No. 3, pp. 224-234

Mean Sea Surface Model of the Caspian Sea

Sergey A. Lebedev 
Geophysical Center, Russian Academy of Sciences Space Research Institute, Russian Academy of Sciences, 119296, Moscow, Molodezhnaya, 3 117997, Moscow, Profsoyuznaya, 84/32
Usually mean sea surface (MSS) is calculated by averaging altimetric measurements of sea surface height (SSH) over a given region and over a given time period. However, in the case of the Caspian Sea this represents a certain challenge and existing MSS models are unacceptable. One of the possible solutions is to analyse the Caspian Sea MSS as task of investigation of space-time variability of equipotential sea surface or SSH without seasonal and synoptic variability. Regional MSS model of the Caspian Sea (GCRAS11 MSS) was calculated according to the following scheme. For satellite altimetry data processing dry tropospheric correction was calculated on atmospheric pressure from nearest weather stations located along the Caspian Sea costal line. From the TOPEX/Poseidon (T/P) and Jason-1/2 (J1/2) satellite altimetry data, the SSH synoptic and seasonal variations for all passes of each repeat cycle were eliminated. In last phase, the GCRAS08 MSS was constructed as a SSH function of latitude, longitude, and time with correction for climatic dynamic topography. For specified time interval SSH was interpolated on grid by radial basis function method. For the first time GCRAS11 MSS model allows to investigate space-time variability of the Caspian Sea level. According to the received result spatial variability of rate of the Caspian Sea level change well correlates with EGM96 gravity anomalies field and the greatest variability is observed in the zone of gravity anomalies gradient maximum.
Keywords: satellite altimetry, Caspian Sea, TOPEX/Poseidon, Jason-1/2, mean sea surface, MSS GCRAS11
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