Show simple item record

contributor authorDeacu, Daniel
contributor authorMyers, Paul G.
date accessioned2017-06-09T17:17:38Z
date available2017-06-09T17:17:38Z
date copyright2005/03/01
date issued2005
identifier issn0022-3670
identifier otherams-82552.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225679
description abstractThe effect of using a variable eddy transfer coefficient for the Gent?McWilliams (GM) parameterization in a (1/3)°-resolution ocean model of the subpolar North Atlantic Ocean is investigated. Results from four experiments with different implementations of this coefficient are compared among themselves as well as with two control experiments. A series of improvements have been obtained in all of the experiments that use a low level of explicit horizontal tracer diffusion. These include a better representation of the overflow waters originating from the Nordic seas, leading to a more realistic deep western boundary current and to increased eddy activity in the deep ocean in the eastern North Atlantic. In the same experiments, the GM velocities ?help? the Labrador Sea Water to spread from the deep convection region to the currents that surround it without incurring significant spurious diapycnal mixing. Thus, two classical pathways for the spreading of this water are established. Moreover, the simulated Labrador Current and the near-surface circulation in the eastern North Atlantic are in better agreement with flow patterns inferred from observations. The increased release of available potential energy obtained in the experiments with variable eddy transfer coefficients is responsible for the simulation of a flow that varies less in time. An overly strong countercurrent still occurs in the Labrador Sea in these experiments, and it has a negative impact on the pathway of the North Atlantic Current in the ?Northwest Corner? and on the hydrography of the Labrador Sea. Nonetheless and overall, the use of the variable eddy transfer coefficient has led to better representations of the general circulation and hydrography in the subpolar North Atlantic.
publisherAmerican Meteorological Society
titleEffect of a Variable Eddy Transfer Coefficient in an Eddy-Permitting Model of the Subpolar North Atlantic Ocean
typeJournal Paper
journal volume35
journal issue3
journal titleJournal of Physical Oceanography
identifier doi10.1175/JPO-2674.1
journal fristpage289
journal lastpage307
treeJournal of Physical Oceanography:;2005:;Volume( 035 ):;issue: 003
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record