摘要：In July 1998, 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 dif- ferent background density stratification and current velocity shear situations at the entrance to the Gulf of Finland. We compared the “measured” eddy diffusivities with the diffusivi- ties parameterized using the Richardson number, the Brunt-Väisälä frequency and with the diffusivities simulated using the two-equation k-ε turbulence closure. Summing up the dis- crepancy of all three time series, the methods applied resulted in a remarkable and consist- ent bias against the measured eddy diffusivity. Contrary to this result, the calculations with the new suggested parameterization scheme, which accounts for the internal wave kinetic energy of the super-inertial frequency band, fitted well for all three time series. Simi- larly, the modified k-ε simulations accounting for the super-inertial internal wave energy matched better the measured profiles.
