ABSTRACT The authors study the dynamics,of a two-layer approximation,to the steadily forced baroc... more ABSTRACT The authors study the dynamics,of a two-layer approximation,to the steadily forced baroclinic circulation in a closed ocean basin with the aim of understanding,its temporal variability and the onset of low-frequency variability. It is found that, for a range of dissipation that includes values used in a number of ocean modeling studies in the past five years, if one waits
Small-scale variation in wind stress due to ocean-atmosphere interaction within the atmospheric b... more Small-scale variation in wind stress due to ocean-atmosphere interaction within the atmospheric boundary layer alters the temporal and spatial scale of Ekman pumping driving the double gyre circulation of the ocean. A high resolution QG ocean model, coupled to a dynamic atmospheric mixed layer, is used to demonstrate that, despite the small spatial scale of the Ekman pumping anomalies, this
The application of no-slip boundary conditions to ocean models is reformulated using Law of the W... more The application of no-slip boundary conditions to ocean models is reformulated using Law of the Wall and Monin-Obhukov Similarity theory. The proposed boundary condition formulation is implemented in the MITgcm. Comparisons with classically formulated free-slip and no-slip cases shows the results are somewhat between the two cases, but generally closer to the free-slip outcomes.
Transport models are required for simulating the subgrid-scale transport by mesoscale eddies, whi... more Transport models are required for simulating the subgrid-scale transport by mesoscale eddies, which are typically not resolved in coarse-grid representations of the ocean circulation. Here, a new transport model from the class of stochastic models is formulated and its performance is tested against an eddy-resolving solution of the ocean circulation. The new approach overcomes drawbacks of the standard Markov models
A local model is used to investigate the dynamics of the western boundary current in a midlatitud... more A local model is used to investigate the dynamics of the western boundary current in a midlatitude, wind- driven gyre. This current is important for the gyre as a whole, and its local instability is correlated with structural changes of the separated eastward jet and the interior gyres. In particular, the eastward jet can be disrupted and broadened in the
... The diffusivity coefficient used was found to effectively prevent bolus numerical dispersion ... more ... The diffusivity coefficient used was found to effectively prevent bolus numerical dispersion of tracers in the model. Vertical diffusion is kept to a realistically low value for the ocean above rough topography—10 −5 m 2 s −1 (Ledwell et al. 1993). ...
ABSTRACT The authors study the dynamics,of a two-layer approximation,to the steadily forced baroc... more ABSTRACT The authors study the dynamics,of a two-layer approximation,to the steadily forced baroclinic circulation in a closed ocean basin with the aim of understanding,its temporal variability and the onset of low-frequency variability. It is found that, for a range of dissipation that includes values used in a number of ocean modeling studies in the past five years, if one waits
Small-scale variation in wind stress due to ocean-atmosphere interaction within the atmospheric b... more Small-scale variation in wind stress due to ocean-atmosphere interaction within the atmospheric boundary layer alters the temporal and spatial scale of Ekman pumping driving the double gyre circulation of the ocean. A high resolution QG ocean model, coupled to a dynamic atmospheric mixed layer, is used to demonstrate that, despite the small spatial scale of the Ekman pumping anomalies, this
The application of no-slip boundary conditions to ocean models is reformulated using Law of the W... more The application of no-slip boundary conditions to ocean models is reformulated using Law of the Wall and Monin-Obhukov Similarity theory. The proposed boundary condition formulation is implemented in the MITgcm. Comparisons with classically formulated free-slip and no-slip cases shows the results are somewhat between the two cases, but generally closer to the free-slip outcomes.
Transport models are required for simulating the subgrid-scale transport by mesoscale eddies, whi... more Transport models are required for simulating the subgrid-scale transport by mesoscale eddies, which are typically not resolved in coarse-grid representations of the ocean circulation. Here, a new transport model from the class of stochastic models is formulated and its performance is tested against an eddy-resolving solution of the ocean circulation. The new approach overcomes drawbacks of the standard Markov models
A local model is used to investigate the dynamics of the western boundary current in a midlatitud... more A local model is used to investigate the dynamics of the western boundary current in a midlatitude, wind- driven gyre. This current is important for the gyre as a whole, and its local instability is correlated with structural changes of the separated eastward jet and the interior gyres. In particular, the eastward jet can be disrupted and broadened in the
... The diffusivity coefficient used was found to effectively prevent bolus numerical dispersion ... more ... The diffusivity coefficient used was found to effectively prevent bolus numerical dispersion of tracers in the model. Vertical diffusion is kept to a realistically low value for the ocean above rough topography—10 −5 m 2 s −1 (Ledwell et al. 1993). ...
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Papers by Pavel Berloff