Life and demise of intrathermocline mesoscale vortices
MetadataShow full item record
This study is focused on finescale dissipation mechanisms of intrathermocline mesoscale vortices exemplified by meddies, large anticyclonic salt lenses of Mediterranean origin commonly observed in the lower North Atlantic thermocline.High-resolution numerical experiments are diagnosed to quantify the rates of temperature and salinity (T, S) dispersion in salt lenses and to determine the relative contribution of variousmixing processes in the decay of their thermohaline signatures. This study finds, in agreement with observations, that meddies dissipate on the characteristic time scale of several years and that their ultimate disintegration can be attributed to thermohaline interleaving driven by double-diffusive mixing. Mechanically generated turbulence, on the other hand, tends to suppress the interleaving and therefore has an adverse net effect on eddy dispersion. It is found that the dispersion properties of static lenses, characterized by density-compensated T–S patterns, and their rapidly rotating counterparts are dramatically different.
(Manuscript received 6 March 2017, in final form 8 October 2017)The article of record as published may be located at http://journals.ametsoc.org/doi/abs/10.1175/JPO-D-17-0044.1
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Peterschmidt, John C. (Monterey, California. Naval Postgraduate School, 1993);In order to investigate the physics behind the dispersion and test future design changes, a detailed finite element model of the PHALANX gun was developed. This is the first finite element model of the gun ever. The normal ...
Chu, Peter C.; Fan, C.W. (2009);Numerical approaches in atmospheric and oceanic modeling inevitably introduce diffusion (or dissipation) and dispersion into the approximate solution. From a physical point of view, advection of a passive tracer ...
A theoretical and experimental investigation of ion acoustic wave dispersion in a non-uniform highly ionized argon plasma Levin, Richard Robert (Monterey, California. U.S. Naval Postgraduate School, 1966);Ion acoustic waves have been artificially excited and detected in the Steady State Plasma Facility at the Naval Postgraduate School by a magnetic excitation device and an optical detection system. The dispersion of these ...