INVESTIGADORES
PALMA Elbio Daniel
artículos
Título:
On the Implementation of passive Open Boundary Conditions for a General Circulation Model: The three dimensional case
Autor/es:
ELBIO D. PALMA; RICARDO P. MATANO
Revista:
JOURNAL OF GEOPHYSICAL RESEARCH
Editorial:
American Geophysical Union
Referencias:
Lugar: Washington; Año: 2000 vol. 105 p. 8605 - 8627
ISSN:
0148-0227
Resumen:
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This article discusses the results of an experimental survey
on the performance of a select group of open boundary conditions (OBCs) for
three-dimensional, primitive equation models. The focus is on passive conditions,
where the model response at the open boundaries is dictated by the interior
dynamics. The performance of the OBCs is tested in a series of numerical
experiments conducted in a rotating channel which includes variable bottom
topography and density stratification. The experiments are selected to enhance
nonlinear phenomena that comprises advection and the propagation of dispersive
waves. The first two experiments study coastal upwelling with constant and
time-varying wind forcing. The third experiment analyses the barotropic and
baroclinic response of a coastal ocean due to the passage of a traveling storm.
The open boundary condition with the best overall performance is the flow
relaxation scheme on sea surface elevation and transport, a radiation condition
for internal velocities, and a combined scheme of flow advection and relaxation
for the temperature field. A modified gravity wave radiation scheme provides
reasonable responses when combined with radiation conditions for internal
velocities and an advection equation for temperature if the forcing is not
changing direction rapidly at the open boundary. Schemes using the method of
characteristics or traditional wave advection schemes fail when combined with
radiation conditions for the baroclinic mode.
