Liu, Y. ., University of Washington, Scho, Seattle, USA, email@example.com
MacCready, P. ., University of Washington, School of Oceanography, Seattle, USA, firstname.lastname@example.org
Hickey, B. ., University of Washington, School of Oceanography, Seattle, USA, email@example.com
COLUMBIA RIVER PLUME INFLUENCE ON SUMMER SHELF CIRCULATION AS REVEALED BY A COASTAL OCEAN CIRCULATION MODEL HINDCAST
A hindcast of the Columbia River (CR) estuarine and coastal ocean circulation in summer 2004 is performed using the ROMS model with open boundary conditions from the NCOM model and realistic atmospheric, tidal and river forcing. The model results are used to describe the subtidal evolution of plume patterns in response to local wind and river flow and to examine the plume influence on the shelf circulation and transport. It is found that a bi-directional plume occurs frequently on the Washington shelf (> 75% of time during 6/15-8/30), during weakening of moderate upwelling favorable wind events as well as weak downwelling events. Its high frequency of occurrence indicates that the CR water will have significant influence on Washington shelf circulation and mixing dynamics in summer. In a case study of a cyclonic eddy developed through interaction of the plume and the upwelling jet, an important pathway is found for nutrient-rich deep canyon water to be upwelled onto the shelf from Astoria Canyon and transported northward along the shelf.
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