期刊
JOURNAL OF PHYSICAL OCEANOGRAPHY
卷 47, 期 2, 页码 261-283出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JPO-D-16-0082.1
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资金
- Australian Research Council [FL150100090]
- National Science Foundation [OCE-1233832]
- Directorate For Geosciences
- Division Of Ocean Sciences [1233832] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1536515] Funding Source: National Science Foundation
A buoyancy and volume budget analysis of bottom-intensified mixing in the abyssal ocean reveals simple expressions for the strong upwelling in very thin continental boundary layers and the interior near-boundary downwelling in the stratified ocean interior. For a given amount of Antarctic Bottom Water that is upwelled through neutral density surfaces in the abyssal ocean ( between 2000 and 5000m), up to 5 times this volume flux is upwelled in narrow, turbulent, sloping bottom boundary layers, while up to 4 times the net upward volume transport of Bottom Water flows downward across isopycnals in the near-boundary stratified ocean interior. These ratios are a direct result of a buoyancy budget with respect to buoyancy surfaces, and these ratios are calculated from knowledge of the stratification in the abyss along with the assumed e-folding height that characterizes the decrease of the magnitude of the turbulent diapycnal buoyancy flux away from the seafloor. These strong diapycnal upward and downward volume transports are confined to a few hundred kilometers of the continental boundaries, with no appreciable diapycnal motion in the bulk of the interior ocean.
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