Eddy stirring and horizontal diffusivity from Argo float observations : geographic and depth variability
Cole, Sylvia T.
Wortham, Cimarron J. L.
Owens, W. Brechner
MetadataShow full item record
Stirring along isopycnals is a significant factor in determining the distribution of tracers within the ocean. Salinity anomalies on density surfaces from Argo float profiles are used to investigate horizontal stirring and estimate eddy mixing lengths. Eddy mixing length and velocity fluctuations from the ECCO2 global state estimate are used to estimate horizontal diffusivity at a 300 km scale in the upper 2000 m with near-global coverage. Diffusivity varies by over two orders of magnitude with latitude, longitude, and depth. In all basins, diffusivity is elevated in zonal bands corresponding to strong current regions, including western boundary current extension regions, the Antarctic Circumpolar Current, and equatorial current systems. The estimated mixing lengths and diffusivities provide an observationally based data set that can be used to test and constrain predictions and parameterizations of eddy stirring.
Author Posting. © American Geophysical Union, 2015. 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 42 (2015): 3989–3997, doi:10.1002/2015GL063827.
Showing items related by title, author, creator and subject.
Ross, Tetjana; Lavery, Andone C. (2008-09)High-frequency broadband (200-300 kHz) acoustic scattering techniques have been used to observe the diffusive regime of double-diffusive convection in the laboratory. Pulse compression signal processing techniques allow ...
Ultra-diffuse hydrothermal venting supports Fe-oxidizing bacteria and massive umber deposition at 5000 m off Hawaii Edwards, Katrina J.; Glazer, Brian T.; Rouxel, Olivier J.; Bach, Wolfgang; Emerson, David; Toner, Brandy M.; Chan, Clara S.; Tebo, Bradley M.; Staudigel, Hubert; Moyer, Craig L. (Nature Publishing Group, 2011-05-05)A novel hydrothermal field has been discovered at the base of Lōihi Seamount, Hawaii, at 5000 mbsl. Geochemical analyses demonstrate that ‘FeMO Deep’, while only 0.2 °C above ambient seawater temperature, derives from a ...
Rypina, Irina I.; Kirincich, Anthony R.; Lentz, Steven; Sundermeyer, Miles A. (American Meteorological Society, 2016-06-29)This paper aims to test the validity, utility, and limitations of the lateral eddy diffusivity concept in a coastal environment through analyzing data from coupled drifter and dye releases within the footprint of a ...