Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution

Barnier, Bernard; Madec, Gurvan; Penduff, Thierry; Molines, Jean‐Marc; Tréguier, Anne‐Marie; Sommer, Julien Le; Beckmann, Aike; Biastoch, Arne; Böning, Claus W.; Dengg, Joachim; Derval, C.; Durand, Edmée; Gulev, Sergei K.; Rémy, Elizabeth; Talandier, Claude; Theetten, Sébastien; Maltrud, Mathew; McClean, Julie L.; Cuevas, Beverly de

doi:10.1007/s10236-009-0180-y

Cited by 323 publications

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“…The wide range of densities associated with this AMOC variability peak suggests that the associated circulation fluctuations have a barotropic character, as indeed is expected within strong recirculations observed off the U.S. coast (e.g., Bryden et al 2009). On the other hand, our two 1 /48 simulations, like many eddy-permitting model solutions, exhibit an unrealistic, almost standing eddy near Cape Hatteras (see, e.g., Barnier et al 2006); whether this half-intrinsic AMOC variability peak is robust and realistic is therefore questionable.…”

Section: Total and Intrinsic Amoc Variability At Interannual-to-decadmentioning

confidence: 77%

“…The six simulations share a partial cell representation of topography and a momentum advection scheme that conserves energy and enstrophy (Barnier et al 2006;Penduff et al 2007;Le Sommer et al 2009); a total variance diminishing (TVD) tracer advection scheme; an isopycnal Laplacian tracer diffusion operator; a vertical mixing scheme based on the TKE turbulent closure model (Blanke and Delecluse 1993); and a convective adjustment scheme based on enhanced vertical mixing in case of static instability. Table 1 summarizes the main differences between these simulations.…”

Section: A Model Simulationsmentioning

confidence: 99%

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Intrinsic Variability of the Atlantic Meridional Overturning Circulation at Interannual-to-Multidecadal Time Scales

Grégorio

Penduff

Sérazin

et al. 2015

Journal of Physical Oceanography

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The low-frequency variability of the Atlantic meridional overturning circulation (AMOC) is investigated from 2, 1 /48, and 1 /128 global ocean-sea ice simulations, with a specific focus on its internally generated (i.e., ''intrinsic'') component. A 327-yr climatological 1 /48 simulation, driven by a repeated seasonal cycle (i.e., a forcing devoid of interannual time scales), is shown to spontaneously generate a significant fraction R of the interannual-to-decadal AMOC variance obtained in a 50-yr ''fully forced'' hindcast (with reanalyzed atmospheric forcing including interannual time scales). This intrinsic variance fraction R slightly depends on whether AMOCs are computed in geopotential or density coordinates, and on the period considered in the climatological simulation, but the following features are quite robust when mesoscale eddies are simulated (at both 1 /48 and 1 /128 resolutions); R barely exceeds 5%-10% in the subpolar gyre but reaches 30%-50% at 348S, up to 20%-40% near 258N, and 40%-60% near the Gulf Stream. About 25% of the meridional heat transport interannual variability is attributed to intrinsic processes at 348S and near the Gulf Stream. Fourier and wavelet spectra, built from the 327-yr 1 /48 climatological simulation, further indicate that spectral peaks of intrinsic AMOC variability (i) are found at specific frequencies ranging from interannual to multidecadal, (ii) often extend over the whole meridional scale of gyres, (iii) stochastically change throughout these 327 yr, and (iv) sometimes match the spectral peaks found in the fully forced hindcast in the North Atlantic. Intrinsic AMOC variability is also detected at multidecadal time scales, with a marked meridional coherence between 358S and 258N (15-30 yr periods) and throughout the whole basin (50-90-yr periods).

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Section: Total and Intrinsic Amoc Variability At Interannual-to-decadmentioning

confidence: 77%

Section: A Model Simulationsmentioning

confidence: 99%

Intrinsic Variability of the Atlantic Meridional Overturning Circulation at Interannual-to-Multidecadal Time Scales

Grégorio

Penduff

Sérazin

et al. 2015

Journal of Physical Oceanography

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“…The vertical layer thickness is 6 m near the ocean surface and increases with depths. A partialcell approach is used for the bottom cell (Barnier et al, 2006). Especially in the subpolar North Atlantic it has been demonstrated that this leads to an improved boundary current circulation (Käse et al, 2001).…”

Section: ) Viking20 -High-resolution Modeling Of the Subpolar North mentioning

confidence: 99%

Intra-seasonal variability of the DWBC in the western subpolar North Atlantic

Fischer

Karstensen

Zantopp

et al. 2015

Progress in Oceanography

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The Deep Western Boundary Current (DWBC) along the western margin of the subpolar North Atlantic is an important component of the deep limb of the Meridional Overturning near its northern origins. A network of moored arrays from Denmark Strait to the tail of the Grand Banks has been installed for almost two decades to observe the boundary currents and transports of North Atlantic Deep Water as part of an internationally coordinated Observatory for the Atlantic Meridional Overturning Circulation. The dominant variability in all of the moored velocity time series is in the week-to-month period range. While the temporal characteristics of this variability changes only gradually between Denmark Strait and Flemish Cap, a broad band of longer term variability is present farther along the path of the DWBC at the Grand Banks and in the interior basins (Labrador and Irminger Seas). The vigorous intraseasonal variability may well mask possible interannual to decadal variability that is typically an order of magnitude smaller than the high-frequency fluctuations. Here, the intra-seasonal variability at key positions along the DWBC path using both, observations and high resolution model data is quantified. The results are used to evaluate the model circulation, and in turn the model is used to relate the discrete measurements to the overall pattern of the subpolar circulation. Topographic waves are found to be trapped by the steep topography all around the western basins, the Labrador and Irminger Seas. In the Labrador Sea, the high intra-seasonal variability of the boundary current regime is separated by a region of extremely low variability in narrow recirculation cells from the basin interior. There, the variability is also on intra-seasonal timescales, but at much longer periods around 50 days. We would like to thank reviewer #2 for his/her very careful evaluation of our manuscript, the constructive criticism and the recommendations for corrections and suggestions. Below, recommendations by the reviewer are in blue and our response in black.Review of "Intra-seasonal variability of the Deep Western Boundary Current in the western subpolar North Atlantic", Manuscript Number: PROOCE-D-13-00096 1 General comments: Using long current meter records in the western margin of the subpolar gyre, the authors investigate the intra-seasonal variability in the Deep Western Boundary Current. From the Denmark Strait to the Grand Banks they show -that the dominant variability is in the week-to-month period range -that 10 day periods dominate the variance, which they attribute to topographic Rossby waves -that at Flemish Cap and farther south, there is also variability at longer periods -that in the basin centers (Labrador and Irminger) the variance dominate at 50 day period and there is almost no variance at 10 days. Using a long time series in the DWBC at 53°N they also find seasonality in the intra-seasonal variability, with an offset of 6 months between the surface and the bottom. Then to validate a new high resolu...

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“…The total vorticity term is discretised by an adaptation of the scheme 21 referred to as the energy-enstrophy conserving (EEN) scheme that conserves both total energy and potential enstrophy. 22 The model domain covers the North Atlantic basin from 208S to 708N and from 98.58W to 208E, with a horizontal resolution of 1/38 x 1/38 cosine (latitude). The vertical discretisation has 42 geopotential levels, with a grid spacing that increases from 12m at the surface to 200m below 1500m depth.…”

Section: Introductionmentioning

confidence: 99%

“…15,16,27 Note that this scheme is also being developed in a pre-operational mode for the main MO operational prototypes recently based on the NEMO-OPA code 19 which has a free-surface and for which some significant numerical improvements have been made. 22 The SAM2v1 assimilation scheme is a multivariate assimilation algorithm consisting of a SEEK (Singular Evolutive Extended Kalman) filter. 28 The SEEK filter is a reduced-order Kalman filter introduced by Pham et al 29 in the context of mesoscale ocean models and has been designed for a large variety of basin-scale ocean models and validated in many studies.…”

Section: Introductionmentioning

confidence: 99%

Data assimilation of simulated SSS SMOS products in an ocean forecasting system

Tranchant

Testut

Ferry

et al. 2008

Journal of Operational Oceanography

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Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution

Abstract: The original version of this article unfortunately contained a mistake. The sequence of first and last name of Bernard Barnier was incorrect. The correct sequence is given above.

Cited by 323 publications

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Intrinsic Variability of the Atlantic Meridional Overturning Circulation at Interannual-to-Multidecadal Time Scales

Intrinsic Variability of the Atlantic Meridional Overturning Circulation at Interannual-to-Multidecadal Time Scales

Intra-seasonal variability of the DWBC in the western subpolar North Atlantic

Data assimilation of simulated SSS SMOS products in an ocean forecasting system

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