Offshore transport of the Alaska Coastal Current water induced by a cyclonic wind field

Details Offshore transport of the Alaska Coastal Current water induced by a cyclonic wind field Offshore transport of the Alaska Coastal Current water induced by a cyclonic wind field

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3703604y&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 3, CiteID L03604

Physics

Oceanography: General: Continental Shelf And Slope Processes (3002), Oceanography: Physical: Fronts And Jets, Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: General: Numerical Modeling (0545, 0560, 1952)

Scientific paper

The Alaska Coastal Current (ACC) is driven by multiple sources of coastal freshwater discharge and propagates alongshore over hundreds of kilometers. The ACC is also subject to downwelling-favorable winds associated with cyclonic wind systems. Spatially-uniform, downwelling winds trap the buoyant ACC waters nearshore. However, we demonstrate with numerical experiments that spatial wind variations, due either to a stationary or translating cyclone, can enhance the offshore transport of buoyant coastal waters in comparison to no-wind conditions. A stationary atmospheric cyclone induces a strong convergence in the coastal current at the upstream periphery of the cyclone. This convergence generates an offshore filament of buoyant water, which evolves into detached anticyclone. A transient atmospheric cyclone enhances the offshore spreading of freshwater by intensifying mesoscale variability of the coastal current. Thus, the spatial structure of the wind field represents a potentially important mechanism for cross-shelf freshwater transport.

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