Ocean Modelling

article

A better, more discriminating test problem for ocean tracer transport

Matthew W. Hecht, Beth A. Wingate, Patricia Kassis

Ocean Modelling > 2000 > 2 > 1-2 > 1-15

Many test problems have been posed in which the behavior of schemes may be examined within the simplified context of passive tracer transport. Most often these tests involve transport of a tracer containing sharp or discontinuous gradients within a smooth advecting field. Hecht et al. [J. Geophys. Res. 100 (1995) 20763-20778] presented a test problem, using the simple analytical gyre of Stommel [Trans...

article

Delaunay mesh generation for an unstructured-grid ocean general circulation model

S. Legrand, V. Legat, E. Deleersnijder

Ocean Modelling > 2000 > 2 > 1-2 > 17-28

An incremental method is presented to generate automatically boundary-fitted Delaunay triangulations of the global ocean. The method takes into account Earth curvature and allows local mesh refinement in order to resolve topological or dynamical features like midocean ridges or western boundary currents. Crucial issues like the nodes insertion process, the boundary integrity problem or the creation...

article

Acceleration of general circulation model convergence by exponential extrapolation

Barry A. Klinger

Ocean Modelling > 2000 > 2 > 1-2 > 61-72

Numerical models of basin-to-global scale ocean circulation generally take thousands of model years to converge to a final steady-state. The long timescale is set by the slow adjustment of the ocean's overall stratification to the classical vertical advective-diffusive balance. During much of this adjustment period, the time evolution of many model variables appears to be an approximately exponential...

article

A theoretical reason to expect inviscid western boundary currents in realistic oceans

Chris W. Hughes

Ocean Modelling > 2000 > 2 > 1-2 > 73-83

The conventional picture of an ocean gyre, based on an ocean with vertical sidewalls, assumes a balance between an input of vorticity by wind stress curl, and a viscous flux of vorticity through the boundary at the same latitude, resulting from a viscous western boundary current which may be significantly modified by nonlinear terms. Potential interactions with topography are also commonly acknowledged...

article

A priori estimates of mixing and circulation in the hard-to-reach water body of Lake Vostok

Alfred Wüest, Eddy Carmack

Ocean Modelling > 2000 > 2 > 1-2 > 29-43

Lake Vostok in Eastern Antarctica is covered by a ~4000 m thick ice sheet that glides over the sub-glacial water body on a time scale of ~20000 years. As a basis for ''pre-expedition'' planning, a priori estimates are made for water temperature, heat flux and currents. Whereas vertical temperature gradients are predicted to be extremely small due to geothermally driven convective turbulence, horizontal...

article

A numerically efficient data analysis method with error map generation

M. Rixen, J.M. Beckers, J.-M. Brankart, P. Brasseur

Ocean Modelling > 2000 > 2 > 1-2 > 45-60

The variational inverse model (VIM) for data analysis was already shown to be statistically equivalent to objective analysis (OA) provided the covariance function for OA and the VIM reproducing kernel are identical. The VIM, however does not allow a direct derivation of the error field associated with the analysis. The purpose of the paper is to extend the one-to-one correspondence between the two...

article

Developments in ocean climate modelling

Stephen M. Griffies, Claus Böning, Frank O. Bryan, Eric P. Chassignet, more

Ocean Modelling > 2000 > 2 > 3-4 > 123-192

This paper presents some research developments in primitive equation ocean models which could impact the ocean component of realistic global coupled climate models aimed at large-scale, low frequency climate simulations and predictions. It is written primarily to an audience of modellers concerned with the ocean component of climate models, although not necessarily experts in the design and implementation...

article

Stratified convection with multiple states

J.A. Whitehead

Ocean Modelling > 2000 > 2 > 3-4 > 109-121

A simplified box model of the cooling of a salt-stratified ocean is analyzed analytically and numerically. A large isothermal basin of salt water has a layer of fresh water at the surface. Beside this is a small basin, cooled from above and connected to the large basin by horizontal tubes at the top, middle and bottom. For small cooling rate, fresh water enters the small basin, is cooled and leaves...

article

A reduced grid for a parallel global ocean general circulation model

M.E. Wickett, P.B. Duffy, G. Rodrigue

Ocean Modelling > 2000 > 2 > 3-4 > 85-107

A limitation of many global climate models with explicit finite-difference numerics is the timestep restriction caused by the decrease in cell size associated with the convergence of meridians near the poles. To keep the longitudinal width of model cells as uniform as possible, we apply a ''reduced'' grid to a three-dimensional primitive equation ocean-climate model. With this grid the number of cells...

INFONA - science communication portal

Ocean Modelling

A better, more discriminating test problem for ocean tracer transport

Delaunay mesh generation for an unstructured-grid ocean general circulation model

Acceleration of general circulation model convergence by exponential extrapolation

A theoretical reason to expect inviscid western boundary currents in realistic oceans

A priori estimates of mixing and circulation in the hard-to-reach water body of Lake Vostok

A numerically efficient data analysis method with error map generation

Developments in ocean climate modelling

Stratified convection with multiple states

A reduced grid for a parallel global ocean general circulation model

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Ocean Modelling

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