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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 4, pp. 72-85

The dynamics of the Caspian Sea based on satellite altimetry data

S.A. Lebedev 1, 2 
1 Geophysical Center RAS, Moscow, Russia
2 Space Research Institute RAS, Moscow, Russia
The article is devoted to the study of dynamics variability of the Caspian Sea based on satellite altimetry data. The technique of calculating the synoptic dynamic topography (DT) as a superposition of the mean sea climate DT calculated by thermohydrodynamic models of Hydrometeorological Center RF and field of sea level anomalies calculated by satellite altimetry data is considered. An analysis of geostrophic currents vorticity confirmed the predominance of cyclonic circulation in the Northern and Middle Caspian and anticyclonic circulation in the Southern Caspian. After 2008, the vorticity in all parts of the sea increased, indicating a regime change in atmospheric circulation over the water area of the Caspian Sea. Analysis of variation of annual average current velocity and vorticity shows that the average current velocity is inversely proportional to the vorticity. From 1993 to 2007, vorticity decreased at a rate of -0,17±0,02•10-7 per year, and average velocity increased at a rate of +0,11±0,06 cm/year. After 2008, the situation changed to the opposite. The vorticity increased at a rate +0,75±0,12•10-7 per year, average velocity decreased at a rate of -0,47±0,19 cm/year.
Keywords: Caspian Sea, water dynamics, remote sensing, satellite altimetry, vorticity, regime of atmospheric circulation
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