Oceanographic and Atmospheric Conditions on the Continental Shelf North of the Monterey Bay During August 2006
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NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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A comprehensive data set from the ocean and atmosphere was obtained just north of the Monterey Bay as part of the Monterey Bay 2006 MB06 field experiment. The wind stress, heat fluxes, and sea surface temperature were sampled by the Naval Postgraduate Schools TWIN OTTER research aircraft. In situ data were collected using ships, moorings, gliders and AUVs. Four data-assimilating numerical models were additionally run, including the Coupled OceanAtmosphere Mesoscale Prediction System COAMPSregistered name model for the atmosphere and the Harvard Ocean Prediction System HOPS, the Regional Ocean Modeling System ROMS, and the Navy Coastal Ocean Model NCOM for the ocean. The scientific focus of the Adaptive Sampling and Prediction Experiment ASAP was on the upwelling relaxation cycle and the resulting three-dimensional coastal circulation near a coastal promontory, in this case Point Ano Nuevo, CA. The emphasis of this study is on the circulation over the continental shelf as estimated from the wind forcing, two ADCP moorings, and model outputs. The wind stress during August 2006 consisted of 3-10 day upwelling favorable events separated by brief 1-3 day relaxations. During the first two weeks there was some correlation between local winds and currents and the three models capability to reproduce the events. During the last two weeks, largely equatorward surface wind stress forced the sea surface and barotropic poleward flow occurred over the shelf, reducing model skill at predicting the circulation. The poleward flow was apparently remotely-forced by mesoscale eddies and alongshore pressure gradients, which were not well simulated by the models. The small, high-resolution model domains were highly reliant on correct open boundary conditions to drive these larger-scale poleward flows. Multiply-nested models were no more effective than well-initialized local models in this respect.
- Physical and Dynamic Oceanography