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Parameterization of Mixed Layer and Deep-Ocean Mesoscales Including NonlinearityIn 2011, Chelton et al. carried out a comprehensive census of mesoscales using altimetry data and reached the following conclusions: "essentially all of the observed mesoscale features are nonlinear" and "mesoscales do not move with the mean velocity but with their own drift velocity," which is "the most germane of all the nonlinear metrics." Accounting for these results in a mesoscale parameterization presents conceptual and practical challenges since linear analysis is no longer usable and one needs a model of nonlinearity. A mesoscale parameterization is presented that has the following features: 1) it is based on the solutions of the nonlinear mesoscale dynamical equations, 2) it describes arbitrary tracers, 3) it includes adiabatic (A) and diabatic (D) regimes, 4) the eddy-induced velocity is the sum of a Gent and McWilliams (GM) term plus a new term representing the difference between drift and mean velocities, 5) the new term lowers the transfer of mean potential energy to mesoscales, 6) the isopycnal slopes are not as flat as in the GM case, 7) deep-ocean stratification is enhanced compared to previous parameterizations where being more weakly stratified allowed a large heat uptake that is not observed, 8) the strength of the Deacon cell is reduced. The numerical results are from a stand-alone ocean code with Coordinated Ocean-Ice Reference Experiment I (CORE-I) normal-year forcing.
Document ID
20180002570
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Canuto, V. M. (NASA Goddard Inst. for Space Studies New York, NY, United States)
Cheng, Y. (Columbia Univ. New York, NY, United States)
Dubovikov, M. S. (SciSpace LLC Bethesda, MD, United States)
Howard, A. M. (RFCUNY, MEDGAR EVERS COLLEGE Brooklyn, NY, United States)
Leboissetier, A. (SciSpace LLC Bethesda, MD, United States)
Date Acquired
April 27, 2018
Publication Date
March 3, 2018
Publication Information
Publication: Journal of Physical Oceanography
Volume: 48
Issue: 3
Subject Category
Oceanography
Meteorology and Climatology
Report/Patent Number
GSFC-E-DAA-TN55399
Funding Number(s)
CONTRACT_GRANT: GISS - SCI
CONTRACT_GRANT: 80NSSC17M0057
CONTRACT_GRANT: NNG17HP03C
Distribution Limits
Public
Copyright
Other
Keywords
Baroclinic flows; Mesoscale processes; Mixing; Subgrid-scale processes; Mesoscal