Cross-Shelf and Out-of-Bay Transport Driven by an Open-Ocean Current
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Zhang-2011-Cross-Shelf and Out-.pdf
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2.43 MB
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Author(s)
Flierl, Glenn Richard
Zhang, Yu
Pedlosky, Joseph
Date Issued
November 2011
Journal
Journal of Physical Oceanography
Publisher
American Meteorological Society
Citation
Zhang, Yu, Joseph Pedlosky, Glenn R. Flierl, 2011: Cross-Shelf and Out-of-Bay Transport Driven by an Open-Ocean Current. J. Phys. Oceanogr., 41, 2168–2186. © 2012 American Meteorological Society
Version
Final published version
Abstract
This paper studies the interaction of an Antarctic Circumpolar Current (ACC)–like wind-driven channel flow with a continental slope and a flat-bottomed bay-shaped shelf near the channel’s southern boundary. Interaction between the model ACC and the topography in the second layer induces local changes of the potential vorticity (PV) flux, which further causes the formation of a first-layer PV front near the base of the topography. Located between the ACC and the first-layer slope, the newly formed PV front is constantly perturbed by the ACC and in turn forces the first-layer slope with its own variability in an intermittent but persistent way. The volume transport of the slope water across the first-layer slope edge is mostly directly driven by eddies and meanders of the new front, and its magnitude is similar to the maximum Ekman transport in the channel. Near the bay’s opening, the effect of the topographic waves, excited by offshore variability, dominates the cross-isobath exchange and induces a mean clockwise shelf circulation. The waves’ propagation is only toward the west and tends to be blocked by the bay’s western boundary in the narrow-shelf region. The ensuing wave–coast interaction amplifies the wave amplitude and the cross-shelf transport. Because the interaction only occurs near the western boundary, the shelf water in the west of the bay is more readily carried offshore than that in the east and the mean shelf circulation is also intensified along the bay’s western boundary.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1175/jpo-d-11-08.1
