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Russian Geology and Geophysics

2018 year, number 11

NATURAL RING STRUCTURES ON THE BAIKAL ICE COVER: ANALYSIS OF EXPERIMENTAL DATA AND MATHEMATICAL MODELING

N.G. Granin1, I.B. Mizandrontsev1, V.V. Kozlov2, E.A. Tsvetova3, R.Yu. Gnatovskii1, V.V. Blinov1, I.A. Aslamov1, K.M. Kucher1, V.G. Ivanov1, A.A. Zhdanov1
1Limnological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Ulan-Batorskaya 3, Irkutsk, 664033, Russia
2V.M. Matrosov Institute for System Dynamics and Control Theory, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 134, Irkutsk, 664033, Russia
3Institute of Computational Mathematics and Mathematical Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrent’eva 6, Novosibirsk, 630000, Russia
Keywords: Ледовый покров, кольцевая структура, течения, апвелинг, гидрат метана, Байкал, Baikal ice cover, ring structure, currents, upwelling, methane hydrate

Abstract

Hydrophysical studies and mathematical modeling of ring structures on the Baikal ice cover have shown that their existence at the stage of ice cover degradation is due to anticyclonic currents. Such currents can be generated as a result of local upwelling, which we associate with the rise of methane hydrates from the top layer of bottom sediments and their dissociation. Analysis of satellite images shows that the radii of ice rings range from 1300 to 2400 m, which is close to the baroclinic Rossby radius of deformation. The measured ice thicknesses in the area of the rings are in agreement with model calculations. Deep water renewal in Lake Baikal can also be associated with the rise of hydrates.