Tidal Energy Available for Mixing at the Hawaiian Ridge

Edward Zaron
The tidal energy budget surrounding the Hawaiian Ridge may be divided conceptually into three components: the energy flux convergence of the surface tide, the energy flux divergence of the internal tide, and the loss of energy to turbulent mixing. In order to infer the energy lost to mixing, we use altimetry data and ocean models to estimate the net convergence of the tidal energy flux at eight tidal frequencies (M2, S2, K2, N2, K1, O1, P1, Q1). By generalized inversion of a high-resolution
more » ... high-resolution regional barotropic model with TOPEX/POSEIDON altimeter data, we estimate that the barotropic tide loses approximately 22 GW within 250km of the Hawaiian Ridge. The spatial distribution of the energy flux convergence compares favorably with both observations and models of baroclinic conversion. We also report on ongoing data analysis and modeling efforts to estimate the energy flux of internal waves away from the Ridge.