Turbulence and diapycnal mixing over the East Pacific Rise crest near 10°N
MetadataShow full item record
Turbulent mixing plays an important role in the return path of the global overturning circulation of the ocean. Previous measurements indicate that much of the mixing takes place near topography, in particular near seamounts and mid-ocean ridges. Here we report on the first microstructure data set collected over the crest and flanks of a fast-spreading ridge. The data indicate that in spite of weak tidally modulated background turbulence levels (ε ≈ 10−10 W kg−1) diapycnal diffusivity is elevated above 10−4 m2 s−1 below crest depth of the ridge throughout the entire region because of the weak density stratification. Near the peaks and in the narrow deep passages of a chain of seamounts, where large horizontal velocities have been observed, turbulence levels are elevated by up to an order of magnitude above background. We conclude that topographic organization plays an important role in determining spatial patterns of turbulence in this region and that both tidal and subinertial energy contribute to the mixing.
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 38 (2011): L15613, doi:10.1029/2011GL048207.
Suggested CitationArticle: Thurnherr, Andreas M., St. Laurent, Louis C., "Turbulence and diapycnal mixing over the East Pacific Rise crest near 10°N", Geophysical Research Letters 38 (2011): L15613, DOI:10.1029/2011GL048207, https://hdl.handle.net/1912/4795
Showing items related by title, author, creator and subject.
Manucharyan, Georgy E.; Caulfield, C. P. (2014-12)We consider experimentally an initially quiescent and linearly stratified fluid with buoyancy frequency NQ in a cylinder subject to surface-stress forcing from a disc of radius R spinning at a constant angular velocity Ω. ...
Tochko, John Steven (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1978-02)The design and operation of a unique flow measuring instrument for bottom boundary layer studies in the marine environment is documented. The effectiveness of the instrument in acquiring data with which models of near ...
Notes on the 1977 summer study program in geophysical fluid dynamics at the Woods Hole Oceanographic Institution Veronis, George; Thayer, Mary C. (Woods Hole Oceanographic Institution, 1977-12)The lectures by Marten Landahl, recorded in the first part of this report, served as the introduction to the study of turbulence which was the principal theme of the nineteenth summer program in Geophysical Fluid Dynamics ...