Analysis of Observed and Modeled Mixed Layers: NOCAL (Northern California) Region.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Surface mixed layer properties off Northern California NOCAL were analyzed statistically and numerically. The observations were acquired on three cruises as part of the Pilot Ocean Prediction Study of the California Current eddies centered ca. 37 to 39N, 125 to 127W during March and August 1982. Mixed layer depth, averaging 33 or - 14m, had a horizontal correlation scale of no more than 35Km, which has significance for relating thermal structure information form individual temperature profiles to that of Fleet Numerical Oceanography Centers FNOC analyses based on a grid length of approximately 300km. Simulations and sensitivity tests were made using the Garwood bulk mixed layer model and the Mellor Level-2.5 diffusion model with the initial and boundary conditions acquired at sea and from FNOC. Upper ocean thermal structure analyses and forecasts were also obtained from the Navys TOPSTOPS-EOTS diffusion model, which has since become operational at FNOC. Comparisons of observations, analyses, and model solutions reveal consistent cooling and deepening by the former two models and excessive warming by the latter model. These significant differences are believed to be related to model resolution, model sensitivity, oceanic and atmospheric data quality, and spatial variability. Author
- Physical and Dynamic Oceanography