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The Prediction of Wind-Driven Coastal Circulation

The Prediction of Wind-Driven Coastal Circulation. PIs: John Allen and Jack Barth, OSU. Academic Partners:. COAS, OSU , Corvallis, OR (Allen, Barth, Boyd, Caldwell, Egbert, Huyer, Kosro, Levine, Miller, Moum, Samelson, Skyllingstad). Government Partners:.

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The Prediction of Wind-Driven Coastal Circulation

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  1. The Prediction of Wind-Driven Coastal Circulation PIs: John Allen and Jack Barth, OSU Academic Partners: COAS, OSU, Corvallis, OR (Allen, Barth, Boyd, Caldwell, Egbert, Huyer, Kosro, Levine, Miller, Moum, Samelson, Skyllingstad) Government Partners: NOAA, NMFS, Newport, OR (Peterson) NOAA, ETL, Boulder, CO (Harlan, Wilczak) Industrial Partners: CODAR Ocean Sensors, Los Altos, CA (Barrick, Lipa) Ocean Imaging, Solana Beach, CA (Svejkovsky)

  2. OSU NOPP Goal: Develop nowcast and forecast systems for wind-driven coastal ocean flow fields (alongshore coastal jets, upwelling and downwelling fronts, eddies, surface and bottom boundary layers) Approach: • High-resolution coastal ocean and coastal atmospheric models • Data assimilation • Observational program • land-based coastal radar • moorings • turbulence profiling • atmospheric profiling • SeaSoar and MiniBAT hydrography and bio-optics

  3. OSU-NOPP: Ocean Observations • wind-driven upwelling separated by wind relaxation events • upwelling over the shelf, broadening over the submarine banks • subsurface thermal features influenced by submarine bank topography Barth, Kosro

  4. OSU-NOPP: Ocean Observations • Land-based coastal radar (CODAR) surface velocities • Alongshore jet following bottom topography and intensified over the submarine banks Kosro, Harlan

  5. OSU-NOPP: Atmospheric Model • mean and variable alongshore wind stress increases by a factor of 3-4 from north to south • intensification near Cape Blanco at 43N Samelson, Skyllingstad, Wilczak

  6. OSU-NOPP: Atmospheric Model Model minus buoy surface air temperature (solid) vs. alongshore wind stress (dashed) Model (solid) vs. buoy (dashed) wind stress • atmospheric model provides useful estimates of • ocean upwelling evidently modifies coastal surface air temperature by 1-5 degrees C over time scales of 1-2 days wind stress (Model SST is from large-scale analysis that does not resolve upwelling response.) Samelson, Skyllingstad, Wilczak

  7. OSU-NOPP: Coastal Ocean Model With spatially uniform winds With spatially varying winds Modeled (solid) vs. observed (dashed) alongshelf currents at 20m (top) with spatially uniform winds (bottom) with spatially variable winds • Results with spatially varying wind stress forcing are qualitatively and quantitatively closer to observations Allen, Gan (Moored observations: Levine, Kosro, Boyd)

  8. OSU-NOPP: Data Assimilating Coastal Ocean Model wind observed velocity with assimilation modeled (no data) 1998 • Land-based radar velocities assimilated into a primitive equation ocean circulation model • velocity correlations between observations and the data-assimilating model substantially improved over a model with no assimilation • Data-assimilating model surface temperature maps capture observed broadening of upwelling region over Heceta Bank Oke, Allen, Miller, Egbert, Kosro

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