Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint
A global ocean circulation model is formulated in terms of the “residual mean ” and used to study eddy–mean flow interaction. Adjoint techniques are used to compute the three-dimensional eddy stress field that minimizes the departure of the coarse-resolution model from climatological observations of...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1001.1086 2023-05-15T13:43:21+02:00 Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint David Ferreira John Marshall Patrick Heimbach The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1001.1086 http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1001.1086 http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf text 2005 ftciteseerx 2020-07-12T00:15:33Z A global ocean circulation model is formulated in terms of the “residual mean ” and used to study eddy–mean flow interaction. Adjoint techniques are used to compute the three-dimensional eddy stress field that minimizes the departure of the coarse-resolution model from climatological observations of temperature. The resulting 3D maps of eddy stress and residual-mean circulation yield a wealth of information about the role of eddies in large-scale ocean circulation. In eddy-rich regions such as the Southern Ocean, the Kuroshio, and the Gulf Stream, eddy stresses have an amplitude comparable to the wind stress, of order 0.2 N m2, and carry momentum from the surface down to the bottom, where they are balanced by mountain form drag. From the optimized eddy stress, 3D maps of horizontal eddy diffusivity are inferred. The diffusivities have a well-defined large-scale structure whose prominent features are 1) large values of (up to 4000 m2 s1) in the western boundary currents and on the equatorial flank of the Antarctic Circumpolar Current and 2) a surface intensification of , suggestive of a dependence on the stratification N². It is shown that implementation of an eddy parameterization scheme in which the eddy diffusivity has an N² dependence significantly improves the climatology of the ocean model state relative to that obtained using a spatially uniform diffusivity. Text Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean The Antarctic |
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English |
description |
A global ocean circulation model is formulated in terms of the “residual mean ” and used to study eddy–mean flow interaction. Adjoint techniques are used to compute the three-dimensional eddy stress field that minimizes the departure of the coarse-resolution model from climatological observations of temperature. The resulting 3D maps of eddy stress and residual-mean circulation yield a wealth of information about the role of eddies in large-scale ocean circulation. In eddy-rich regions such as the Southern Ocean, the Kuroshio, and the Gulf Stream, eddy stresses have an amplitude comparable to the wind stress, of order 0.2 N m2, and carry momentum from the surface down to the bottom, where they are balanced by mountain form drag. From the optimized eddy stress, 3D maps of horizontal eddy diffusivity are inferred. The diffusivities have a well-defined large-scale structure whose prominent features are 1) large values of (up to 4000 m2 s1) in the western boundary currents and on the equatorial flank of the Antarctic Circumpolar Current and 2) a surface intensification of , suggestive of a dependence on the stratification N². It is shown that implementation of an eddy parameterization scheme in which the eddy diffusivity has an N² dependence significantly improves the climatology of the ocean model state relative to that obtained using a spatially uniform diffusivity. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
David Ferreira John Marshall Patrick Heimbach |
spellingShingle |
David Ferreira John Marshall Patrick Heimbach Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
author_facet |
David Ferreira John Marshall Patrick Heimbach |
author_sort |
David Ferreira |
title |
Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
title_short |
Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
title_full |
Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
title_fullStr |
Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
title_full_unstemmed |
Estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
title_sort |
estimating eddy stresses by fitting dynamics to observations using a residual‐mean ocean circulation model and its adjoint |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1001.1086 http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1001.1086 http://www-paoc.mit.edu/paoc/papers/jpo2785.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766187883061837824 |