Model evaluation experiments in the North Atlantic Basin: simulations in nonlinear terrain-following coordinates

Haidvogel, Dale B.; Arango, Hernan G.; Hedstrom, Kate; Beckmann, Aike; Malanotte‐Rizzoli, Paola; Shchepetkin, Alexander F.

doi:10.1016/s0377-0265(00)00049-x

Cited by 723 publications

(438 citation statements)

References 30 publications

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“…5) and meridional heat transport (Fig. 6) compare well with the other estimates obtained with models of comparable resolution (see Chassignet et al, 2000;Haidvogel et al, 2000). The maximum of the overturning stream function is about 20 Sv, and typical amplitudes of the meridional heat flux are of the order of 0.8 PW.…”

Section: Finite-element Model Of North Atlantic (Fena)supporting

confidence: 85%

A finite-element ocean model: principles and evaluation

2004

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We describe a three-dimensional (3D) finite-element ocean model designed for investigating the largescale ocean circulation on time scales from years to decades. The model solves the primitive equations in the dynamical part and the advection-diffusion equations for temperature and salinity in the thermodynamical part. The time-stepping is implicit. The 3D mesh is composed of tetrahedra and has a variable resolution. It is based on an unstructured 2D surface mesh and is stratified in the vertical direction. The model uses linear functions for horizontal velocity and tracers on tetrahedra, and for surface elevation on surface triangles. The vertical velocity field is elementwise constant. An important ingredient of the model is the Galerkin least-squares stabilization used to minimize effects of unresolved boundary layers and make the matrices to be inverted in time-stepping better conditioned. The model performance was tested in a 16-year simulation of the North Atlantic using a mesh covering the area between 7°and 80°N and providing variable horizontal resolution from 0.3°to 1.5°.

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Section: Finite-element Model Of North Atlantic (Fena)supporting

confidence: 85%

A finite-element ocean model: principles and evaluation

2004

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“…[49] A nonhydrostatic version of ROMS [Haidvogel et al, 2000] has been developed recently by Kanarska et al [2007]. Using the pressure correction method, the external mode in the nonhydrostatic version of ROMS is solved with the inclusion of nonhydrostatic pressure but with the assumption that q can be treated as a "slowly varying" force which does not vary over an internal time step.…”

Section: Discussion and Summarymentioning

confidence: 99%

A nonhydrostatic version of FVCOM: 1. Validation experiments

et al. 2010

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[1] The unstructured grid finite volume coastal ocean model (FVCOM) system has been expanded to include nonhydrostatic dynamics. This addition uses the factional step method with both split mode explicit and semi-implicit schemes. The unstructured grid finite volume method, combined with a correction of the final free surface from its intermediate value with inclusion of nonhydrostatic effects, efficiently reduces numerical damping and thus ensures second-order accuracy of the solutions with local/global volume conservation. Numerical experiments have been made to fully validate the nonhydrostatic FVCOM, including surface standing and solitary waves in idealized flat-and slopingbottomed channels in homogeneous conditions, the density adjustment problem for lock exchange flow in a flat-bottomed channel, and two-layer internal solitary wave breaking on a sloping shelf. The model results agree well with the relevant analytical solutions and laboratory data. These validation experiments demonstrate that the nonhydrostatic FVCOM is capable of resolving complex nonhydrostatic dynamics in coastal and estuarine regions.

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“…[6] Our mass-conserving ocean model is based on ROMS [Haidvogel et al, 2000;Shchepetkin and McWilliams, 2001], an evolution of SCRUM [Song and Haidvogel, 1994], without their Boussinesq approximations. The Boussinesq approximations [Boussinesq, 1903], based on the incompressible approximations of seawater, have been used in many existing ocean models [e.g., Griffies et al, 2000].…”

Section: Model Predictionmentioning

confidence: 99%

Ocean bottom pressure waves predicted in the tropical Pacific

Song

Zlotnicki

2004

Geophysical Research Letters

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Using a mass‐conserving (non‐Boussinesq) Pacific Ocean model and TOPEX/POSEIDON sea‐surface height measurements, we document previously unreported bottom pressure waves (BPWs), associated with large‐amplitude eddies (vortices) both north and south of the Equator. The bottom pressure signals, defined as the vertically integrated water‐mass anomalies, are found to propagate westward across the Pacific Ocean with an approximate 4‐mbar amplitude (1 mbar = 100 Newton/m2, approximately equivalent to 1 cm of sea surface height), continuously interacting with topographic features. Their wavelength is about 1100 kilometers, phase speed is about 0.5 m/s, and period is about 30‐days, all consistent with the known properties of tropical instability waves (TIWs). These results suggest that the constantly evolving tropical instability eddies might have strong bottom pressure signals, therefore, likely alias the U.S.‐German Gravity Recovery and Climate Experiment (GRACE) measurements, which have a monthly‐sampling period.

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Model evaluation experiments in the North Atlantic Basin: simulations in nonlinear terrain-following coordinates

Cited by 723 publications

References 30 publications

A finite-element ocean model: principles and evaluation

A finite-element ocean model: principles and evaluation

A nonhydrostatic version of FVCOM: 1. Validation experiments

Ocean bottom pressure waves predicted in the tropical Pacific

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