Turbulence Scales for the Ice/Ocean Boundary Layer
Understanding the scales of turbulence in the IOBL is the central issue in developing reasonable models for transfer of properties between the ice cover and the underlying ocean. This chapter presents several examples from field observations that shed light on the impact of both stress and buoyancy on turbulence in the IOBL, and use them to develop a heuristic approach to specifying the mixing length. A key in this development is the apparent connection between the inverse wave number at the peak of the area-preserving w spectrum and the master length scale for turbulence. As discussed in Section 3.6, the concept was first explored for the IOBL using data from the 1972 AIDJEX Pilot Study (McPhee and Smith 1976). Figure 5.1, adapted from that work, shows our estimates of eddy viscosity based on admittedly crude analysis of the spectra observed during an AIDJEX storm, analyzed in the manner suggested by Busch and Panofsky (1968), and compared with calculations from one of the first attempts at large eddy simulation for the atmospheric boundary layer (Deardorff 1972). This was far from conclusive; however, later measurements tended to confirm that basic approach.
KeywordsMixed Layer Atmospheric Boundary Layer Friction Velocity Eddy Viscosity Turbulence Scale
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