Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 6, pp. 186-194
On the question of vortex dynamics of waters in the western basin of the Aral Sea
A.I. Ginzburg
1 , A.G. Kostianoy
1, 2 , N.A. Sheremet
1 , D.M. Soloviev
3 1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Moscow Witte University, Moscow, Russia
3 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 21.11.2022
DOI: 10.21046/2070-7401-2022-19-6-186-194
The vortex dynamics in the western basin of the Aral Sea and its relationship with the accompanying wind conditions are studied on the basis of high spatial resolution satellite images (OLI (Operational Land Imager) Landsat-8, -9, MSI (Multispectral Instrument) Sentinel-2A/B) of the autumn period of different years (September 2017 and 2019, September and October 2022). With winds of 2–5 m/s, the entire western basin is filled with vortices, vortex dipoles and their packings with structure diameters ranging from several hundred meters to about 9 km. At the same time, the greatest vortex activity is observed in the wide and deep part of the basin between 44°40' and 45°20′ N. An element of circulation, repeated on satellite images of different years, has been identified — an anticyclonic vortex with a diameter of 7–9 km in the central part of the basin, approximately between 45°10′ and 45°15′ N, with cyclones on its periphery changing their positions. This anticyclonic eddy is observed at both southerly and northerly winds, most clearly at a northeasterly wind of less than 3 m/s. The defining role in the formation of this local anticyclonic circulation is played, apparently, by the peculiarity of the bottom topography: here there is the deepest part of the basin with a steep western slope and a gentler eastern one.
Keywords: water circulation in the Western Aral Sea basin, vortices, vortex dipoles, Aral Artemia cysts, satellite data
Full textReferences:
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