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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, 2020, Vol. 17, No. 6, pp. 103-109

Investigation of seasonal and interannual variability of water exchange through the Middle Caspian based on satellite altimetry

S.A. Lebedev 1, 2 , A.G. Kostianoy 3, 4, 5 
1 Geophysical Center RAS, Moscow, Russia
2 Maykop State Technological University, Maykop, Russia
3 Shirshov Institute of Oceanology RAS, Moscow, Russia
4 Witte Moscow University, Moscow, Russia
5 Space Research Institute RAS, Moscow, Russia
Accepted: 15.09.2020
DOI: 10.21046/2070-7401-2020-17-6-103-109
Seasonal and interannual variability of water exchange between the Northern and Middle (133 track), and Middle and Southern (209 track) Caspian Sea was calculated based on satellite altimetry data of TOPEX/Poseidon and Jason-1, -2, -3 satellites for 1992–2018. The climatic value of water exchange through the 133 track was +0.41 Sv, and through the 209 track +0.37 Sv. The difference can be explained by the evaporation of water and the recirculation in the Middle Caspian cyclonic gyre. The maximum negative water exchange anomaly of –0.147 Sv occurs on average in August while the maximum positive water exchange anomaly of +0.112 Sv occurs in February. Since 2005 anomalies of water exchange through the Middle Caspian fluctuates from +0,013 Sv (2006) to –0,017 Sv (2008), i. e. the amplitude of interannual variability of water exchange became five times less than in 1992–2005. This is an interesting observation which means that after 2005 in the course of the continuous sea level drop water exchange through the Middle Caspian from year to year became much more stable.
Keywords: climate variability, water exchange, the Caspian Sea, Volga River, remote sensing, satellite altimetry
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