1School of Physics and Ryan Institute, National University of Ireland, Galway
2Norwegian Meteorological Institute, Oslo, Norway
Received: 24 Sep 2012 – Published in Ocean Sci. Discuss.: 18 Dec 2012
Abstract. Microstructure measurements were collected using an autonomous freely rising profiler under a variety of different atmospheric forcing and sea states in the open ocean. Here, profiles of turbulent kinetic energy dissipation rate, ε, are compared with various proposed scalings. In the oceanic boundary layer, the depth dependence of ε was found to be largely consistent with that expected for a shear-driven wall layer. This is in contrast with many recent studies which suggest higher rates of turbulent kinetic energy dissipation in the near surface of the ocean. However, some dissipation profiles appeared to scale with the sum of the wind and swell generated Stokes shear with this scaling extending beyond the mixed layer depth. Integrating ε in the mixed layer yielded results that 1% of the wind power referenced to 10 m is being dissipated here.
Revised: 16 May 2013 – Accepted: 11 Jun 2013 – Published: 08 Jul 2013
Citation: Sutherland, G., Ward, B., and Christensen, K. H.: Wave-turbulence scaling in the ocean mixed layer, Ocean Sci., 9, 597-608, doi:10.5194/os-9-597-2013, 2013.