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Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution

Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution
Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution
Series of sensitivity tests were performed with az-coordinate, global eddy-permitting (1/4?) ocean/sea-ice model (the ORCA-R025 model configuration developed for the DRAKKAR project) to carefully evaluate the impact of recent state-of-the-art numerical schemes on model solutions. The combination of an energy?enstrophy conserving (EEN) scheme for momentum advection with a partial step (PS) representation of the bottom topography yields significant improvements in the mean circulation. Well known biases in the representation of western boundary currents, such as in the Atlantic the detachment of the Gulf Stream, the path of the North Atlantic Current, the location of the Confluence, and the strength of the Zapiola Eddy in the south Atlantic, are partly corrected. Similar improvements are found in the Pacific, Indian, and Southern Oceans, and characteristics of the mean flow are generally much closer to observations. Comparisons with other state-of-the-art models show that the ORCA-R025 configuration generally performs better at similar resolution. In addition, the model solution is often comparable to solutions obtained at 1/6 or 1/10? resolution in some aspects concerning mean flow patterns and distribution of eddy kinetic energy. Although the reasons for these improvements are not analyzed in detail in this paper, evidence is shown that the combination of EEN with PS reduces numerical noise near the bottom, which is likely to affect current?topography interactions in a systematic way. We conclude that significant corrections of the mean biases presently seen in general circulation model solutions at eddy-permitting resolution can still be expected from the development of numerical methods, which represent an alternative to increasing resolution.
global ocean, eddy-permitting ocean model, momentum advection scheme, partial step topography, eddy/topography interactions
1616-7341
543-567
Barnier, B.
0179fa7c-ed1b-45df-9e81-5a959268d99b
Madec, G.
7e2ec04b-896a-4861-b2d0-b74f39d748c2
Penduff, T.
acc9246c-9cec-4909-814f-ec3eefa7f11d
Molines, J-M.
ab7d1ff4-3ef2-4cba-9347-f3b66ba16f0b
Treguier, A-M.
c4c193b2-73b5-4452-a5ec-8a5d9f72c68d
Le Sommer, J.
b2f7856c-9030-4d9e-bda6-dbfea753d329
Beckmann, A.
34cfe70f-3ad7-4d1d-82b8-a022a55416ff
Boning, C.
0174efd6-d0e1-47ac-aa9d-47d3dc6c718d
Dengg, J.
8980e0c2-8c60-4986-af69-0e254cc6ce79
Derval, C.
a3f2181d-2cfa-48b4-b65b-9f6fef74a9d6
Durand, E.
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Gulev, S.
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Remy, E.
9665d49c-880f-4cf9-9154-e05d6f7d897e
Talandier, C.
e3c52f12-4ced-42d3-add5-7b74e23bc915
Theerren, S.
83f93797-a344-4f8b-806c-730787c74baa
Maltrud, M.
845b75a1-30fb-421b-8984-451d0bed935e
McClean, J.
5dbbae77-f2cf-496b-907f-af038e97e93b
de Cuevas, B.
01cc697c-2832-4de6-87bf-bf9f16c1f906
Barnier, B.
0179fa7c-ed1b-45df-9e81-5a959268d99b
Madec, G.
7e2ec04b-896a-4861-b2d0-b74f39d748c2
Penduff, T.
acc9246c-9cec-4909-814f-ec3eefa7f11d
Molines, J-M.
ab7d1ff4-3ef2-4cba-9347-f3b66ba16f0b
Treguier, A-M.
c4c193b2-73b5-4452-a5ec-8a5d9f72c68d
Le Sommer, J.
b2f7856c-9030-4d9e-bda6-dbfea753d329
Beckmann, A.
34cfe70f-3ad7-4d1d-82b8-a022a55416ff
Boning, C.
0174efd6-d0e1-47ac-aa9d-47d3dc6c718d
Dengg, J.
8980e0c2-8c60-4986-af69-0e254cc6ce79
Derval, C.
a3f2181d-2cfa-48b4-b65b-9f6fef74a9d6
Durand, E.
0d03f819-7185-421a-a62e-34613891766a
Gulev, S.
25f95dd3-a6fe-4460-9d8f-3106b392cc49
Remy, E.
9665d49c-880f-4cf9-9154-e05d6f7d897e
Talandier, C.
e3c52f12-4ced-42d3-add5-7b74e23bc915
Theerren, S.
83f93797-a344-4f8b-806c-730787c74baa
Maltrud, M.
845b75a1-30fb-421b-8984-451d0bed935e
McClean, J.
5dbbae77-f2cf-496b-907f-af038e97e93b
de Cuevas, B.
01cc697c-2832-4de6-87bf-bf9f16c1f906

Barnier, B., Madec, G., Penduff, T., Molines, J-M., Treguier, A-M., Le Sommer, J., Beckmann, A., Boning, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theerren, S., Maltrud, M., McClean, J. and de Cuevas, B. (2006) Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution. Ocean Dynamics, 56 (5-6), 543-567. (doi:10.1007/s10236-006-0082-1).

Record type: Article

Abstract

Series of sensitivity tests were performed with az-coordinate, global eddy-permitting (1/4?) ocean/sea-ice model (the ORCA-R025 model configuration developed for the DRAKKAR project) to carefully evaluate the impact of recent state-of-the-art numerical schemes on model solutions. The combination of an energy?enstrophy conserving (EEN) scheme for momentum advection with a partial step (PS) representation of the bottom topography yields significant improvements in the mean circulation. Well known biases in the representation of western boundary currents, such as in the Atlantic the detachment of the Gulf Stream, the path of the North Atlantic Current, the location of the Confluence, and the strength of the Zapiola Eddy in the south Atlantic, are partly corrected. Similar improvements are found in the Pacific, Indian, and Southern Oceans, and characteristics of the mean flow are generally much closer to observations. Comparisons with other state-of-the-art models show that the ORCA-R025 configuration generally performs better at similar resolution. In addition, the model solution is often comparable to solutions obtained at 1/6 or 1/10? resolution in some aspects concerning mean flow patterns and distribution of eddy kinetic energy. Although the reasons for these improvements are not analyzed in detail in this paper, evidence is shown that the combination of EEN with PS reduces numerical noise near the bottom, which is likely to affect current?topography interactions in a systematic way. We conclude that significant corrections of the mean biases presently seen in general circulation model solutions at eddy-permitting resolution can still be expected from the development of numerical methods, which represent an alternative to increasing resolution.

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Published date: 2006
Keywords: global ocean, eddy-permitting ocean model, momentum advection scheme, partial step topography, eddy/topography interactions

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Local EPrints ID: 43992
URI: http://eprints.soton.ac.uk/id/eprint/43992
ISSN: 1616-7341
PURE UUID: b58b9d57-664a-4b8a-b9f5-e301daa2d7d3

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Date deposited: 06 Feb 2007
Last modified: 13 Mar 2019 21:08

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Contributors

Author: B. Barnier
Author: G. Madec
Author: T. Penduff
Author: J-M. Molines
Author: A-M. Treguier
Author: J. Le Sommer
Author: A. Beckmann
Author: C. Boning
Author: J. Dengg
Author: C. Derval
Author: E. Durand
Author: S. Gulev
Author: E. Remy
Author: C. Talandier
Author: S. Theerren
Author: M. Maltrud
Author: J. McClean
Author: B. de Cuevas

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