NeverWorld2: an idealized model hierarchy to investigate ocean mesoscale eddies across resolutions

Marques, Gustavo; Loose, Nora; Yankovsky, Elizabeth; Steinberg, Jacob; Chang, Chiung-Yin; Bhamidipati, Neeraja; Adcroft, Alistair; Fox‐Kemper, Baylor; Griffies, Stephen M.; Hallberg, Robert; Jansen, Malte F.; Khatri, Hemant; Zanna, Laure

doi:10.5194/gmd-15-6567-2022

Cited by 12 publications

(57 citation statements)

References 39 publications

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“…We have systematically considered the effects of mesoscale eddies on energetic properties and flow vertical structure in the idealized model hierarchy NeverWorld2 (G. M. Marques et al., 2022). We began by characterizing the extent to which mesoscale eddies are resolved at 1/4°, 1/8°, 1/16°, and 1/32° resolutions using two criteria for lengthscale — the Rossby deformation radius R D and the local most unstable wavelength R MAX (generally several times smaller than R D ).…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Details of the model configuration, including a substantial discussion of its advantages and pitfalls, are fully described in G. M. Marques et al. (2022).…”

Section: The Neverworld2 Modelmentioning

confidence: 99%

“…Its isopycnal configuration accurately represents the highly adiabatic mesoscale and larger flows in the ocean's interior, while completely avoiding spurious diapycnal mixing. Details of the model configuration, including a substantial discussion of its advantages and pitfalls, are fully described in G. M. Marques et al (2022).…”

Section: The Neverworld2 Modelmentioning

confidence: 99%

“…We employ the GFDL-MOM6 numerical ocean code (Adcroft et al, 2019) to solve the adiabatic, stacked shallow water equations on a rotating spherical grid, in an idealized one-basin configuration termed "NeverWorld2" (G. M. Marques et al, 2022). The model is purely adiabatic, with steady zonal wind forcing in an idealized two-hemisphere-plus-channel domain geometry, and shares many aspects with the NeverWorld model of Jansen et al (2020), hence the name.…”

Section: The Neverworld2 Modelmentioning

confidence: 99%

“…The Jupyter notebooks used to generate figures in the manuscript are available at https://doi.org/10.5281/ zenodo.6558379. The NeverWorld2 configuration used in this manuscript is detailed in G. M. Marques et al (2022). The MOM6 source code and NeverWorld2 configuration files are available at https://doi.org/10.5281/ zenodo.6993951 (Bhamidipati et al, 2022).…”

Section: Appendix A: Linear Qg Instability Analysis As a Metric For R...mentioning

confidence: 99%

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Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy

Yankovsky

Zanna

Smith

2022

J Adv Model Earth Syst

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The understanding and representation of energetic transfers associated with ocean mesoscale eddies is fundamental to the development of parameterizations for climate models. We investigate the influence of eddies on flow vertical structure as a function of underlying dynamical regime and grid resolution. We employ the GFDL‐MOM6 in an idealized configuration and systematically consider four horizontal resolutions: 1/4°, 1/8°, 1/16°, and 1/32°. We analyze the distributions of potential and kinetic energy, decomposed into barotropic and baroclinic, and eddy and mean parts. As resolution increases and baroclinically unstable modes are better captured, kinetic energy increases and potential energy decreases. The dominant trend in vertical structure is an increasing fraction of kinetic energy going into the barotropic mode, particularly its eddy component, as eddies are increasingly resolved. We attribute the increased baroclinicity at low resolutions to inaccurate representation of vertical energy fluxes, leading to suppressed barotropization and energy trapping in high vertical modes. We also explore how the underlying dynamical regime influences energetic pathways. In cases where large‐scale flow is dominantly barotropic, resolving the deformation radius is less crucial to accurately capturing the flow's vertical structure. We find the barotropic kinetic energy fraction to be a useful metric in assessing vertical structure. In the highest‐resolution case, the barotropic kinetic energy fraction correlates with the scale separation between the deformation scale and the energy‐containing scale, that is, the extent of the eddy‐driven inverse cascade. This work suggests that mesoscale eddy parameterizations should incorporate the energetic effects of eddies on vertical structure in a scale‐aware, physically informed manner.

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Section: Summary and Discussionmentioning

confidence: 99%

“…Details of the model configuration, including a substantial discussion of its advantages and pitfalls, are fully described in G. M. Marques et al. (2022).…”

Section: The Neverworld2 Modelmentioning

confidence: 99%

Section: The Neverworld2 Modelmentioning

confidence: 99%

Section: The Neverworld2 Modelmentioning

confidence: 99%

Section: Appendix A: Linear Qg Instability Analysis As a Metric For R...mentioning

confidence: 99%

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Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy

Yankovsky

Zanna

Smith

2022

J Adv Model Earth Syst

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Parameterizing eddy form stress in a thickness-weighted average isopycnal ocean model

Loose

Marques²,

Adcroft

et al. 2022

Preprint

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Mesoscale eddies are unresolved in most of today's global ocean models, and their effect on the large-scale ocean circulation needs to be parameterized. Greatbatch and Lamb (1990, GL90) suggested an eddy form stress parameterization that mixes geostrophic momentum in the vertical. The GL90 vertical viscosity scheme, which is equivalent to the Gent and McWilliams (1990, GM90) parameterization under the geostrophic assumption, has seen only very limited use, and exclusively in models that use z-coordinates and are of very coarse resolution. In this paper, we explore the GL90 parameterization in an idealized isopycnal coordinate model, both from a theoretical and practical perspective. We further compare the effects of the GM90 and GL90 parameterizations across a range of non-eddying to eddy-permitting resolutions. From a theoretical perspective, the GL90 parameterization is more attractive than the GM90 scheme for isopycnal coordinate models because GL90 provides an interpretation that is fully consistent with thickness-weighted isopycnal averaging, while GM90 cannot be entirely reconciled with any fully isopycnal averaging framework. From a practical perspective, the GL90 and GM90 parameterizations lead to extremely similar energy levels, flow and vertical structure, even though their energetic pathways are very different. The equivalence holds true from non-eddying through eddy-permitting resolution. We conclude that in isopycnal coordinate models, the GL90 parameterization provides a good-if not equivalent-alternative to the GM90 parameterization. The GL90 parameterization is more advantageous in terms of computational efficiency, ease of implementation, and numerical stability.

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SPEEDY-NEMO: performance and applications of a fully-coupled intermediate-complexity climate model

Ruggieri,

Abid,

García-Serrano

et al. 2024

Clim Dyn

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A fully-coupled general circulation model of intermediate complexity is documented. The study presents an overview of the model climatology and variability, with particular attention to the phenomenology of processes that are relevant for the predictability of the climate system on seasonal-to-decadal time-scales. It is shown that the model can realistically simulate the general circulation of the atmosphere and the ocean, as well as the major modes of climate variability on the examined time-scales: e.g. El Niño-Southern Oscillation, North Atlantic Oscillation, Tropical Atlantic Variability, Pacific Decadal Variability, Atlantic Multi-decadal Variability. Potential applications of the model are discussed, with emphasis on the possibility of generating sets of low-cost large-ensemble retrospective forecasts. We argue that the presented model is suitable to be employed in traditional and innovative model experiments that can play a significant role in future developments of seasonal-to-decadal climate prediction.

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NeverWorld2: an idealized model hierarchy to investigate ocean mesoscale eddies across resolutions

Cited by 12 publications

References 39 publications

Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy

Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy

Parameterizing eddy form stress in a thickness-weighted average isopycnal ocean model

SPEEDY-NEMO: performance and applications of a fully-coupled intermediate-complexity climate model

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