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Parameterization of Mixed Layer and Deep-Ocean Mesoscales Including Nonlinearity
External Online Source: doi:10.1175/JPO-D-16-0255.1
Author and Affiliation:
Canuto, V. M.(NASA Goddard Inst. for Space Studies, New York, NY, United States)
Cheng, Y.(Columbia Univ., NASA Goddard Institute for Space Studies, and Center for Climate Systems Research, New York, NY, United States)
Dubovikov, M. S.(SciSpace LLC, Bethesda, MD, United States)
Howard, A. M.(RFCUNY, MEDGAR EVERS COLLEGE, Dept. of Physics and Computer Science, NASA Goddard Institute for Space Studies)
Leboissetier, A.(SciSpace LLC, Bethesda, MD, United States)
Abstract: In 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.
Publication Date: Mar 03, 2018
Document ID:
20180002570
(Acquired May 15, 2018)
Subject Category: OCEANOGRAPHY; METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: GSFC-E-DAA-TN55399
Document Type: Journal Article
Publication Information: Journal of Physical Oceanography; p. 555-572; Volume 48; No. 3
Publisher Information: American Meteorological Society
Contract/Grant/Task Num: 80NSSC17M0057; NNG17HP03C; GISS - SCI
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 18p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: PARAMETERIZATION; OCEANS; MIXING LAYERS (FLUIDS); OCEAN BOTTOM; MESOSCALE PHENOMENA; STRATIFICATION; ADIABATIC FLOW; OCEAN MODELS; NONLINEAR EQUATIONS; NONLINEARITY; HEAT TRANSFER; SLOPES; VORTICES; POTENTIAL ENERGY; SEA ICE
Other Descriptors: BAROCLINIC FLOWS; MESOSCALE PROCESSES; MIXING; SUBGRID-SCALE PROCESSES; MESOSCAL
Availability Source: Other Sources
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