Turbulent behavior of a fine mesh (1/12°) numerical simulation of the North Atlantic

Paiva, Afonso M.; Hargrove, John; Chassignet, Eric P.; Bleck, Rainer

doi:10.1016/s0924-7963(99)00020-2

Cited by 57 publications

(41 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At this resolution all the mesoscale and microscale fluxes are sub-grid scale, and their transport effects must be parameterized. Although more powerful computers may soon decrease the feasible grid scale to a marginal mesoscale eddy resolution of O(25) km, even finer grids of O(10) km or better are needed to adequately resolve the fluxes produced by mesoscale motions (Paiva et al 1999;Smith et al 2000). Furthermore, even marginal eddy resolution requires some parameterization of the missing eddy fluxes (Roberts and Marshall 1998).…”

Section: Introductionmentioning

confidence: 99%

Parameterization of Eddy Fluxes near Oceanic Boundaries

et al. 2008

View full text Add to dashboard Cite

In the stably stratified interior of the ocean, mesoscale eddies transport materials by quasiadiabatic isopycnal stirring. Resolving or parameterizing these effects is important for modeling the oceanic general circulation and climate. Near the bottom and near the surface, however, microscale boundary-layer turbulence overcomes the adiabatic, isopycnal constraints for the mesoscale transport. In this paper we present a formalism for representing this transition from adiabatic, isopycnally-oriented mesoscale fluxes in the interior to the diabatic, along-boundary mesoscale fluxes near the boundaries. We propose a simple parameterization form and illustrate its consequences in an idealized flow. We emphasize that the transition is not confined to the turbulent boundary layers, but extends into the partially diabatic transition layers on their interiorward edge. A transition layer occurs because of the mesoscale variability in the boundary layer and the associated mesoscale-microscale dynamical coupling.

show abstract

Section: Introductionmentioning

confidence: 99%

Parameterization of Eddy Fluxes near Oceanic Boundaries

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Along with the ongoing (and beneficial) increase of basin-and global-scale ocean model resolution (Paiva et al, 1999;Smith et al, 2000;Eden and Böning, 2002;Masumoto et al, 2004;Chanut et al, 2007), eddyadmitting ocean models require further investigation since the 1 4…”

Section: Introductionmentioning

confidence: 99%

Influence of numerical schemes on current-topography interactions in 1/4° global ocean simulations

et al. 2007

View full text Add to dashboard Cite

Abstract. The combined use of partial steps and of an energy-enstrophy conserving momentum advection scheme was shown by Barnier et al. (2006) to yield substantial improvements in the surface solution of the DRAKKAR 1 4• global sea-ice/ocean model. The present study extends this investigation below the surface with a special focus on the Atlantic and reveals many improvements there as well: e.g. more realistic path, structure and transports of major currents (Gulf Stream, North Atlantic Current, Confluence region, Zapiola anticyclone), behavior of shedded rings, narrower subsurface boundary currents, stronger mean and eddy flows (MKE and EKE) at depth, beneficial enhancement of cyclonic (anticyclonic) flows around topographic depressions (mountains). Interestingly, adding a no-slip boundary condition to this improved model setup cancels most of these improvements, bringing back the biases diagnosed without the improved momentum advection scheme and partial steps (these biases are typical of other models at comparable or higher resolutions). This shows that current-topography interactions and full-depth eddy-admitting model solutions can be seriously deteriorated by near-bottom sidewall friction, either explicit or inherent to inadequate numerical schemes.

show abstract

“…The horizontal grid is defined on a Mercator projection with the resolution given by ∆Φ x ∆Φcos(Φ), where Φis the latitude. The first simulation (Fig.1), configured from 28 o S to 65 o N, was integrated with MICOM for 20 years using monthly climatological COADSbased forcing (including freshwater flux) plus a weak restoration to monthly climatological surface salinity (Paiva et al, 1999;Garraffo et al, 2001a,b). The second simulation (Fig.2), configured from 28 o S to 70 o N, including the Mediterranean Sea, was first spun-up for 6 years with MICOM using monthly climatological ECMWF atmospheric fields (including freshwater flux) plus a weak restoration to monthly climatological surface salinity, and is presently further integrated using 6-hourly ECMWF forcing from 1979 to 2000.…”

Section: Resultsmentioning

confidence: 99%

Nowcast/Forecast System For Coastal/Open Ocean Regions

Chassignet¹,

Halliwell²

2002

View full text Add to dashboard Cite

LONG-TERM GOALSTo develop and evaluate a nowcast/forecast system for coastal/open ocean regions with the Hybrid Coordinate Ocean Model (HYCOM). APPROACHA series of numerical models of increasing complexity and resolution is used to (a) evaluate the hybrid coordinate design of the model, (b) develop an understanding of the interaction between the ocean interior and the coastal regions, and (c) evaluate the model's forecast skills.

show abstract

Turbulent behavior of a fine mesh (1/12°) numerical simulation of the North Atlantic

Cited by 57 publications

References 24 publications

Parameterization of Eddy Fluxes near Oceanic Boundaries

Parameterization of Eddy Fluxes near Oceanic Boundaries

Influence of numerical schemes on current-topography interactions in 1/4° global ocean simulations

Nowcast/Forecast System For Coastal/Open Ocean Regions

Contact Info

Product

Resources

About