A note on modeling double diffusive mixing in the global ocean |
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| Authors: | Lakshmi Kantha Sandro Carniel Mauro Sclavo |
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| Institution: | 1. Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309, USA;2. Institute of Marine Sciences, National Research Council, Venice, Italy;1. Indian Institute of Astrophysics, Bengaluru 560034, India;2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA;1. Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai 608502, Tamilnadu, India;2. Ocean Colour Application and Measurement Division, Ocean Science Group, National Remote Sensing Centre, Balanagar, Hyderabad 500 625, Andhra Pradesh, India;1. Indian Institute of Tropical Meteorology (IITM), Pune, 411 008, India;2. Dept. of Meteorology and Oceanography, Andhra University, Visakhapatnam, 530 003, India;3. Dept. of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, 411007, India |
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| Abstract: | Though ubiquitous in the global oceans, double diffusive mixing has been largely ignored or poorly represented in the models of turbulent mixing in the ocean and in 3-D ocean models, until recently. Salt fingers occur in the interior of many marginal seas and ocean basins, the Tyrrhenian Sea and the subtropical Atlantic being two examples. Diffusive convection type of double diffusion occurs in the upper layers of many sub-polar seas and polar oceans due to cold melt water from sea ice. Consequently, it is important to be able to properly parameterize double diffusive mixing in basin scale and global ocean models, so that the water mass structure in the interior of the ocean can be properly simulated. This note describes a model for double diffusive mixing in the presence of background shear, based on Mellor–Yamada type second moment closure, more specifically Kantha, 2003, Kantha and Clayson, 2004 second moment closure models of resulting turbulence, following Canuto et al. (2008a) but employing a different strategy for modeling the pertinent terms in the second moment equations. The resulting model is suitable for inclusion in ocean general circulation models. |
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