Tidlegare gjesteforelesninger og seminarer - Side 90
Friday Seminar by Philippe Cury.
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Friday Seminar by John McNamara.
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Friday Seminar by Rus Hoelzel.
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Friday Seminar by Menno Bouma.
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Friday Seminar by Åke Brannström.
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Friday Seminar by Mihaela Pavlicev.
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A theoretical model for propagation of internal waves under an ice cover is developed. The sea water is considered to be inviscid, non-rotating, and incompressible and the Brunt-Väisälä frequency is supposed to be constant. The ice is considered of uniform thickness, with constant values of Young's modulus, Poisson's ratio, density and compressive stress in the ice. The boundary conditions are such that the normal velocity at the bottom is zero and, at the undersurface of the ice, the linearized kinematical and dynamic boundary conditions are satisfied. We present and analyze explicit solutions for the internal waves under the ice cover and the dispersion equations. It is shown that when the frequency is near, but smaller than the Brunt-Vaisela frequency the ice deflections can be considerable. The theoretical results are compared with experimental data for the Arctic regions.
Sergey Muzylev is at the Shirsov Institute of Oceanology, Moscow
The study is based on field measurements since 2002. We analyze the transport of Antarctic Bottom Water in Deep Channels of the Atlantic: Vema Channel (31deg S), Romanche Fracture Zone (0 deg) and Vema Fracture Zone (11 deg N). The flow of bottom water in the Vema Channel can reach 4 mln. sq. m per second and the velocity is as high as 60 cm/s. The transport and velocities in the Romanche Fracture Zone and Vema Fracture Zone are smaller and do not exceed 500 th. sq. m per sec. The major penetration of bottom waters to the Northeastern Atlantic basins occurs through the Vema FZ but not through the Romanche FZ because strong tidal internal waves on the slopes of the Mid-Atlantic Ridge near Romanche FZ exceed 50 m, while at the Vema FZ they are approximately 20 m. Such difference in mixing of bottom waters with the overlying North Atlantic Deep water results in the fact the deep Northeastern Atlantic basins are filled with the bottom water transported through the Vema FZ.
Eugene Morozov is proessor at the Shirshov Institute of Oceanology, Moscow
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Friday Seminar
By Eric Edeline.
Friday Seminar by Hans Metz.
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Friday Seminar
By Stefan Geritz.
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