On the simulation of temperature and salinity fields in the Arctic Ocean |
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Authors: | N G Iakovlev |
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Institution: | 1.Institute of Numerical Mathematics,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | This paper considers the formation of the thermohaline structure of the Arctic Ocean: the formation of the salinity field
and a freshwater reservoir in the Beaufort Sea and the transport of warm Atlantic water into the central part of the Arctic
Ocean. A new version of the Finite Element Model of the Arctic Ocean (FEMAO) with a low spatial resolution is used. The main
distinctions of this version are the following features: a new equation of state, a more sophisticated parameterization of
vertical turbulence, modified formulations for the boundary conditions on open boundaries (using satellite data on the sea
level) and at the upper boundary of the ocean, and the use of a variable eddy diffusivity in the parameterization of the eddy
transport of a scalar. Our experiments indicated that the use of the parameterization of the eddy transport of a scalar enhances
the transport of warm Atlantic waters to the central part of the Arctic Ocean through the Fram Strait; the results are most
realistic when a variable coefficient is used. The Neptune effect has a contradictory role and, in the future, a higher spatial
resolution should be used instead of this parameterization. We revealed that a key factor in the thermohaline fields on a
large time scale is the interaction with the Atlantic Ocean, which is the source of heat and saline water. |
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