A study on the baroclinic structure of the abyssal circulation |
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| Authors: | Luo De-hai Huang Fei |
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| Institution: | (1) Department of Atmospheric and Oceanic Sciences, Ocean University of Qingdao, 266003 Qingdao, China;(2) Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, 266003 Qingdao, China |
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| Abstract: | In this paper, the linear continuously tratified model of the abyssal circulation proposed by Pedlosky (1992) was extended
to include the second order term -(γθ
zzz
) in the vertical turbulent mixing parameterization of
, in whichk
v is a vertical diffusion coefficient, and γ is the second order coefficient of turbulent mixing (or simply called γ-term and
γ<0 is only allowed). The influence of the γ-term on the baroclinic structure of the abyssal circulation driven by upwelling
out of the abyss was investigated. It was found that the γ-term has a noticeable influence on the baroclinic structure of
the upwelling driven abyssal circulation. For uniform upwelling, it favors the baroclinic layering of the abyssal circulation
in the eastern part of the basin, but prevents the layering in the west. In addition, this parameter was found to decrease
the vertically averaging meridional velocity of the abyssal circulation from the west to the east on the southern boundary.
For upwelling localized near the eastern boundary, the γ-term favors baroclinic layering of the abyssal circulation in the
whole basin. Especially, on the southern boundary the γ-term could strengthen the vertically averaging meridional velocity
in the west, but greatly weaken it in the east. The model presented here might be considered as an extension of the Pedlosky
baroclinic model of the abyssal circulation. |
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| Keywords: | linear model abyssal circulation baroclinic structure |
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