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Dynamics and Modeling of Turbulent Mixing in Oceanic Flows

Abstract : The long-term goal of this research is to refine and extend simple (existing) model parameterizations for turbulent diapycnal mixing for use in large scale numerical ocean models where such processes occur at the subgrid-scale. From a scientific view point, the goal is to obtain new insights into the dynamics of stratified turbulence that will translate into simple effective parameterizations for use in ocean models. The primary objective of this project is to bridge the gap between parameterizations and models for small-scale turbulent mixing developed from fundamental direct numerical simulations (DNS) and grid turbulence experiments (Venayagamoorthy and Stretch 2006, 2010, Stretch and Venayagamoorthy 2010) to geophysical (mesoscale and larger) scale models with an emphasis on making progress towards improved turbulent parameterizations in the ocean. The strategy is to use model-data comparisons in conjunction with theoretical modeling efforts to investigate and improve the efficacy of existing parameterizations for turbulent mixing.