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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, 2023, Vol. 20, No. 6, pp. 258-275

On horizontal water circulation in Lake Sevan (satellite information)

A.I. Ginzburg 1 , N.A. Sheremet 1 , A.G. Kostianoy 1, 2, 3 , O.Yu. Lavrova 4 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Moscow Witte University, Moscow, Russia
3 Maykop State Technological University, Maykop, Russia
4 Space Research Institute RAS, Moscow, Russia
Accepted: 14.11.2023
DOI: 10.21046/2070-7401-2023-20-6-258-275
The article examines the variability of eddy dynamics in the surface layer of Lake Sevan in summer, together with the variability of wind speed and direction over the basin. The study was carried from analysis of a series of sequential Sentinel-2A/B MSI (Multispectral Instrument) visible satellite images with high spatiotemporal resolution (10 m, 5–10 days) with close-in-dates Sentinel-1A/B SAR radar images and data on wind speed and direction of a number of meteorological stations (MS) in the period from July 11 to August 15, 2019. The analysis showed that during the period under review in Small Sevan, with stable northeastern winds, a traditional cyclonic circulation was observed. The main changes in circulation in Large Sevan took place from July 11 to July 31: on July 11, the predominant circulation element was an eddy dipole from a cyclone in the southern half of the deep-water part of the basin (~20 km in the latitudinal direction and ~15 km in the meridional direction) and an anticyclone of approximately the same size to the north of it; from July 16 to July 26, the cyclonic eddy increased in the meridional direction and included two interconnected cyclonic eddies of a smaller size (~7 km); from July 31 to August 15, the cyclonic gyre with attached anticyclones on its periphery invariably occupied most of the deep-sea basin. Local wind directions over Large Sevan, the speed of which throughout the entire period under review generally did not exceed 2 m/s, changed noticeably on time scales of a day and, perhaps, smaller. At the same time, according to the radar images, winds of eastern and southeastern directions were often observed, information about which was absent in the MS archives available to us.
Keywords: Lake Sevan, water circulation of Lake Sevan, eddies, eddy dipoles, visible satellite images, radar images, wind effects
Full text

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