AbstractThe general problem of exchange from a shallow shelf across sharp topography to the deep ocean forced by narrow, cross-shelf wind jets is studied using quasigeostrophic theory and an idealized primitive equation numerical model. Our interest is motivated by katabatic winds that eminate from narrow fjords in southeast Greenland, although similar topographically constrained wind jets are found throughout the world oceans. Because there is no net vorticity input by the wind, the circulation is largely confined to the region near the forcing. Circulation over the shelf is limited by bottom friction for weakly stratified flows, but stratification allows for much stronger upper layer flows that are regulated by weak coupling to the lower layer. Over the sloping topography, the topographic beta-effect limits the deep flow while, for sufficient stratification, the upper layer flow can cross the topography to connect the shelf to the open ocean. This can be an effective transport mechanism even for short, strong wind events because damping of the upper layer flow is weak. A variety of transients are generated for an abrupt onset of winds, including short topography Rossby waves, long topographic Rossby waves, and inertial waves. Using parameters representative of southeast Greenland, katabatic wind events will force an offshore transport of (0:4 Sv) that, when considered for two days, will result in an offshore flux of (5 × 1010 m3).
Journal of Physical Oceanography – American Meteorological Society
Published: Dec 12, 2017
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