Sensitivity of Seawater Temperature and Salinity to their Restoring Times, Appending in the Boundary Conditions for these Variables at the Free Surface of the Laptev Sea in the No-Ice Period
https://doi.org/10.59887/fpg/m5h2-uu55-3va9
Abstract
In order to study sensitivity of seawater temperature and salinity in the no-ice Laptev Sea to their restoring times, appending in the boundary conditions for these variables at the free surface, the 3D finite-element hydrostatic model QUODDY-4 and the indirect means of describing internal tidal waves have been applied. The latter is based on the use of the corrected eddy diffusivity representing the sum of the same uncorrected diffusivity and the diapycnal diffusivity. The first of them characterizes the influence of non-tidal factors, computed using 2.5-level eddy closure scheme, the second, determined by the ratio of internal tidal waves induced baroclinic tidal energy dissipation to the buoyancy frequency in square, the influence of purely tidal factor. The estimate of this dissipation obtained from a solution of auxiliary problem on the internal tidal waves dynamics and energetics is attached. Seawater temperature and salinity in the subsurface and near-bottom layers of the Sea and also their vertical distributions along the 120E meridional transection obtained for the strong, moderate, and mixed restoring times are discussed. As a result, it is clarified that seawater temperature and salinity are weakly sensitive to changes in the restoring time. The saying follows from a comparison of model averaged (over a chosen period and by the Sea area) values of seawater temperature and salinity, and from their local vertical profiles, computed with regard to accepted estimates of the restoring time.
Keywords
sensitivity,
modeling,
internal tidal waves (ITW),
ITW-induced baroclinic tidal energy dissipation,
restoring time,
the Laptev Sea
Supporting agencies: The work was carried out within the framework of the State assignment No. FMWE-2021–0014.
About the Authors
B. A. Kagan
Shirshov Institute of Oceanology, Russian Academy of Sciences
Russian Federation
Russian Federation
36 Nakhimovsky Prosp., Moscow 117997
E. V. Sofina
Shirshov Institute of Oceanology, Russian Academy of Sciences; Russian State Hydrometeorological University
Russian Federation
Russian Federation
36 Nakhimovsky Prosp., Moscow 117997
79 Voronezhskaya St., St. Petersburg, 192007
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Review
For citations:
Kagan B.A., Sofina E.V. Sensitivity of Seawater Temperature and Salinity to their Restoring Times, Appending in the Boundary Conditions for these Variables at the Free Surface of the Laptev Sea in the No-Ice Period. Fundamental and Applied Hydrophysics. 2023;16(1):24–34. (In Russ.) https://doi.org/10.59887/fpg/m5h2-uu55-3va9
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