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Upper-Ocean Turbulence during a Westerly Wind Burst: A Comparison of Large-Eddy Simulation Results and Microstructure Measurements

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  • The response of the upper ocean to westerly wind forcing in the western equatorial Pacific was modeled by means of large-eddy simulation for the purpose of comparison with concurrent microstructure observations. The model was initialized using currents and hydrography measured during the Coupled Ocean–Atmosphere Response Experiment (COARE) and forced using measurements of surface fluxes over a 24-h period. Comparison of turbulence statistics from the model with those estimated from concurrent measurements reveals good agreement within the mixed layer. The shortcomings of the model appear in the stratified fluid below the mixed layer, where the vertical length scales of turbulent eddies are limited by stratification and are not adequately resolved by the model. Model predictions of vertical heat and salt fluxes in the entrainment zone at the base of the mixed layer are very similar to estimates based on microstructure data.
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  • Skyllingstad, Eric D., W. D. Smyth, J. N. Moum, H. Wijesekera, 1999: Upper-Ocean Turbulence during a Westerly Wind Burst: A Comparison of Large-Eddy Simulation Results and Microstructure Measurements. Journal of Physical Oceanography, 29, 5–28
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  • 29
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  • 1
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  • Department of Energy (DOE) under Contract DE-AC06-76RLO 1830. Two of the authors (WDS and JNM) were supported by the National Science Foundation (OCE 9110552). H. Wijesekera was supported by the National Science Foundation (OCE 9525858).
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