A systematic modular approach to investigate the respective roles of the ocean and atmosphere in setting El Nino 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 Nino characteristics ( periodicity and base amplitude) and errors (regularity) and 2) the considerable improvement of simulated El Nino 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.

Representing El Nino in coupled ocean-atmosphere GCMs: The dominant role of the atmospheric component

Navarra A;
2004

Abstract

A systematic modular approach to investigate the respective roles of the ocean and atmosphere in setting El Nino 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 Nino characteristics ( periodicity and base amplitude) and errors (regularity) and 2) the considerable improvement of simulated El Nino 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.
2004
Guilyardi E; Gualdi S; Slingo J; Navarra A; Delecluse P; Cole J; Madec G; Roberts M; Latif M; Terray L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/902695
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