Langmuir circulations in a surface layer bounded by a strong thermocline

Abstract

It is typical for the water containing Langmuir circulations to be bounded below by a thermocline. When this bounding thermocline is strong, it may be expected to act as an effective "slippery bottom' constraint. Such an assumption has been invoked previously, but failed to predict a preferred spacing for the windrows produced by the circulations. This model assumed that the momentum transfers across the horizontal boundaries of the mixed layer were independent of the water motion induced by Langmuir circulation. Here, mixed boundary conditions are explored. Estimates of the transfer coefficients in these boundary conditions suggest that the revised model differs only slightly from the earlier one, but allows for a more general and realistic stress model. -from Authors