Scale-aware deterministic and stochastic parametrizations of eddy-mean flow interaction

Zanna, Laure; Porta Mana, PierGianLuca; Anstey, James; David, Tomos; Bolton, Thomas

doi:https://doi.org/10.1016/j.ocemod.2017.01.004

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Scale-aware deterministic and stochastic parametrizations of eddy-mean flow interaction

2017
By Zanna, Laure ; Porta Mana, PierGianLuca ; Anstey, James ; ...
Source: Ocean Modelling, 111, 66-80.

[PDF-2.19 MB]

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Journal Title:

Ocean Modelling
Personal Author:

Zanna, Laure ; Porta Mana, PierGianLuca ; Anstey, James ; David, Tomos ; Bolton, Thomas

Zanna, Laure ; Porta Mana, PierGianLuca ; Anstey, James ; David, Tomos ; Bolton, Thomas Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CICSP (Cooperative Institute for Climate Science)

OAR (Oceanic and Atmospheric Research) ; CICSP (Cooperative Institute for Climate Science) Less -
Description:

The role of mesoscale eddies is crucial for the ocean circulation and its energy budget. The sub-grid scale eddy variability needs to be parametrized in ocean models, even at so-called eddy permitting resolutions. Porta Mana and Zanna (2014) propose an eddy parametrization based on a non-Newtonian stress which depends on the partially resolved scales and their variability. In the present study, we test two versions of the parametrization, one deterministic and one stochastic, at coarse and eddy-permitting resolutions in a double gyre quasi-geostrophic model. The parametrization leads to drastic improvements in the mean state and variability of the ocean state, namely in the jet rectification and the kinetic-energy spectra as a function of wavenumber and frequency for eddy permitting models. The parametrization also appears to have a stabilizing effect on the model, especially the stochastic version. The parametrization possesses attractive features for implementation in global models: very little computational cost, it is flow aware and uses the properties of the underlying flow. The deterministic coefficient is scale-aware, while the stochastic parameter is scale- and flow-aware with dependence on resolution, stratification and wind forcing.
Source:

Ocean Modelling, 111, 66-80.
DOI:

https://doi.org/https://doi.org/10.1016/j.ocemod.2017.01.004
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4320106
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CC BY
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Submitted
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urn:sha256:a6e3854d2ded2c5a178a86d0d845c4962705b38c560550242a99344686dd5c49
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https://repository.library.noaa.gov/view/noaa/20526/noaa_20526_DS1.pdf
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Scale-aware deterministic and stochastic parametrizations of eddy-mean flow interaction

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