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Representing El Niño in coupled ocean–atmosphere GCMs: the dominant role of the atmospheric component

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Guilyardi, E., Gualdi, S., Slingo, J., Navarra, A., Delecluse, P., Cole, J., Madec, G., Roberts, M., Latif, M. and Terray, L. (2004) Representing El Niño in coupled ocean–atmosphere GCMs: the dominant role of the atmospheric component. Journal of Climate, 17 (24). pp. 4623-4629. ISSN 1520-0442

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To link to this article DOI: 10.1175/JCLI-3260.1

Abstract/Summary

A systematic modular approach to investigate the respective roles of the ocean and atmosphere in setting El Niño characteristics in coupled general circulation models is presented. Several state-of-the-art coupled models sharing either the same atmosphere or the same ocean are compared. Major results include 1) the dominant role of the atmosphere model in setting El Niño characteristics (periodicity and base amplitude) and errors (regularity) and 2) the considerable improvement of simulated El Niño power spectra—toward lower frequency—when the atmosphere resolution is significantly increased. Likely reasons for such behavior are briefly discussed. It is argued that this new modular strategy represents a generic approach to identifying the source of both coupled mechanisms and model error and will provide a methodology for guiding model improvement.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
Faculty of Science > School of Mathematical and Physical Sciences > NCAS
ID Code:5882
Publisher:American Meteorological Society

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