Improvement of ocean mixed layer model toward the accurate prediction of future global warming

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Using the large eddy simulation model, we have carried out idealized numerical experiments for the oceanic mixed layer processes under several forcing scenarios consisting of wind stress, heating, and cooling; the obtained results were used to assess the most widely used Mellor-Yamada (MY) mixed layer model. We have modified its formulation on the turbulent length scale and the stability functions following the recent study of the atmospheric mixed layer to improve the performance in reproducing the upper ocean response under each forcing scenario.We have next incorporated thus modified mixed layer model into an ocean general circulation model to assess its performance in the realistic situations in the ocean. Comparing the numerical results with the observed ones in the northwestern Pacific, it has been shown that this model performs much better than the original MY model under strong wind forcing after passage of typhoons in summer and under sea surface cooling in winter.