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|Title:||Observation, Parameterization and Simulation of Turbulent Mixing in the Gulf of Finland, the Baltic Sea|
|Authors:||LILOVER Madis-jaak; STIPS ADOLF|
|Citation:||Proceedings of the US-EU-Baltic 2008 p. 1-8|
|Type:||Contributions to Conferences|
|Abstract:||Abstract-Three time series of shear microstructure measurements (duration 13, 24 and 14 h respectively) were performed in 3 different wind forcing regimes as well as in 3 different background density stratification and current velocity shear situations at the entrance to the Gulf of Finland, in July 1998. Vertical shear of current velocity was enhanced by near-inertial waves during the first (A1) and third (A3) time series. We compared a Richardson number based parameterization and an estimation using the two equation k-e turbulence closure (General Ocean Turbulence Model, GOTM) with ¿measured¿ eddy diffusivities. For two out of the three time series eddy diffusivities calculated via a Richardson number parameterization and via simulation using the k-e model agreed well with the experimental data. However, in the case of relatively high current velocity shear and weak background density stratification (time series A3) both applied methods resulted in a remarkable discrepancy against the measured eddy diffusivity. On the contrary, calculations with a new parameterization scheme, which considers the internal wave kinetic energy fitted well for all three time series. Similarly the modified k-e simulations which considered the internal wave energy level better matched the measured profiles.|
|JRC Institute:||Institute for Environment and Sustainability|
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