A comparison of the spatial distributions of baroclinic tidal energy dissipation and diapycnal diffusivity in the Barents and Kara Seas in an effort to estimate tidal changes in regional climates of marine systems
Abstract
A solution of equations of the 3D finite-element hydrostatic model QUODDY-4 shows that the fields of the averaged (over a tidal cycle) depth-integrated baroclinic tidal energy dissipation and the depth-averaged diapycnal diffusivity will differ in the Barents and Kara Seas both qualitatively and quantitatively. So, if in the Barents Sea the above distributions are a maximum in the southern regions and a minimum to the west from the Novaya Zemlya islands, then in the Kara Sea maximum values fall on the Central plato and also on Baydaratskii, Obskii, Gydanskii and Eniseyskii bays, whereas minimum values are detected in discrete spots, scattered basically in the north-eastern part of the sea only. The fields of the diapycnal diffusivity in these seas bear a general resemblance to those for dissipation, their values in the Kara Sea being an order of magnitude less than in the Barents Sea. This fact is explained by an increase in the buoyancy frequency squared in the Kara Sea as compared with the Barents Sea. Then, allowing for the approximation of «weak interaction» and comparing values of vertical eddy diffusivities, found without considering tidal forcing, and the diapycnal diffusivities, we ensure that the influence of tidally induced diapycnal diffusion must affect the climate of the Barents Sea and must not be essentially pronounced in the near-estuary regions of the Kara Sea.
Keywords
marine system climates,
baroclinic tidal energy dissipation,
diapycnal diffusivity,
model QUODDY-4,
Barents and Kara Seas
Supporting agencies: Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (грант 17-05-00263а).
About the Authors
B. А. Kagan
Санкт-Петербургский филиал Института океанологии им. П. П. Ширшова РАН
Russian Federation
Russian Federation
E. V. Sofina
Санкт-Петербургский филиал Института океанологии им. П. П. Ширшова РАН; Российский государственный гидрометеорологический университет
Russian Federation
Russian Federation
A. A. Timofeev
Санкт-Петербургский филиал Института океанологии им. П. П. Ширшова РАН
Russian Federation
Russian Federation
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Review
For citations:
Kagan B.А., Sofina E.V., Timofeev A.A. A comparison of the spatial distributions of baroclinic tidal energy dissipation and diapycnal diffusivity in the Barents and Kara Seas in an effort to estimate tidal changes in regional climates of marine systems. Fundamental and Applied Hydrophysics. 2017;10(2):5-12. (In Russ.)
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