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Inferring deep ocean tidal energy dissipation from the global high‐resolution data‐assimilative HAMTIDE model
Author(s) -
Taguchi E.,
Stammer D.,
Zahel W.
Publication year - 2014
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1002/2013jc009766
Subject(s) - barotropic fluid , dissipation , tidal power , baroclinity , residual , turbulence , drag , environmental science , atmospheric sciences , meteorology , geology , physics , mechanics , climatology , thermodynamics , mathematics , ecology , algorithm , biology
Energy dissipation rates of eight major semidiurnal and diurnal tidal constituents are inferred using a barotropic data assimilative tide model with 7.5' spatial resolution. Dynamical residuals and dynamical residual power, estimated through the assimilation procedure as a correction for model uncertainties, constitute an essential contribution to deep‐ocean and shallow‐seas dissipation rates. Resulting total dissipation rates amount to 3.54 TW, of which 2.44 TW (69%) are accounted for by theM 2component alone. Concentrating on the deep ocean (> 1000 m water depth), the dissipation by all eight constituents amounts to 1.42 TW, and 0.93 TW just for theM 2component. These results are higher by 19% and 38% than dissipation rates estimated by Egbert and Ray (2003), respectively. Of the globally dissipated 2.44 TW M 2energy, 1.24 TW are estimated to arise from bottom drag and eddy turbulence, 1.20 TW from residual power. For just the deep ocean, respective numbers amount to 0.10 TW for bottom drag and eddy turbulence, 1.07 TW for barotropic‐to‐baroclinic energy conversion due to the internal wave drag. Interpreting negative residual power −0.24 TW as a potential tidal energy source, a net surface‐to‐internal tideM 2energy conversion would amount to 0.83 TW.