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Tanaka 2006
Tanaka, K. (2006). Effects of the Earth's rotation and bottom slope on a density current descending a sloping bottom. Journal of Geophysical Research 111: doi: 10.1029/2006JC003677. issn: 0148-0227.

The dynamic and transport processes associated with the descent of dense water along a sloping bottom are investigated by numerical experiments. The focus is on effects of the Earth's rotation (the Coriolis parameter f) and bottom slope (inclination S). Before baroclinic instability grows to finite amplitude (development stage), downslope volume transport agrees roughly with an estimate based on the Ekman layer theory. The volume transport decreases with increasing f, and it is larger in steep slope cases. The offshore extension scale of the dense water region is mainly determined by internal radius of deformation, which decreases with increasing f and increases with increasing S. The growth rate of the baroclinic instability increases with increasing f and S. The baroclinic instability is also affected by energy transfer due to Reynolds stress, especially in the low- and mid-latitude regions. After the instability grows to finite amplitude (mature stage), the dense water is effectively transported offshore by the eddy flows. The eddy transport decreases with increasing f, and it is lower in steep slope cases than in gentle slope cases. That is, although the flow instability becomes stronger with increasing f and S in the development stage, the offshore eddy transport of dense water becomes less efficient with increasing f and S in the mature stage. The mechanisms of these effects are also examined in detail.

BACKGROUND DATA FILES

Abstract

Keywords
Oceanography, General, Numerical modeling (0545, 0560), Oceanography, General, Continental shelf and slope processes, Oceanography, Physical, Eddies and mesoscale processes, Oceanography, Physical, Overflows
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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