Publications des scientifiques de l'IRD

Dewitte Boris, Purca S., Illig Serena, Renault Lionel, Giese B. S. (2008). Low-frequency modulation of intraseasonal equatorial Kelvin wave activity in the Pacific from SODA : 1958-2001. Journal of Climate, 21 (22), p. 6060-6069. ISSN 0894-8755.

Titre du document
Low-frequency modulation of intraseasonal equatorial Kelvin wave activity in the Pacific from SODA : 1958-2001
Année de publication
2008
Type de document
Article référencé dans le Web of Science WOS:000261107800021
Auteurs
Dewitte Boris, Purca S., Illig Serena, Renault Lionel, Giese B. S.
Source
Journal of Climate, 2008, 21 (22), p. 6060-6069 ISSN 0894-8755
Intraseasonal equatorial Kelvin wave activity (IEKW) at a low frequency in the Pacific is investigated using the Simple Ocean Data Assimilation (SODA) oceanic reanalyses. A vertical and horizontal mode decomposition of SODA variability allows estimation of the Kelvin wave amplitude according to the most energetic baroclinic modes. A wavenumber-frequency analysis is then performed on the time series to derive indices of modulation of the IEKW at various frequency bands. The results indicate that the IEKW activity undergoes a significant modulation that projects onto baroclinic modes and is not related in a straightforward manner to the low-frequency climate variability in the Pacific. Linear model experiments corroborate that part of the modulation of the IEKW is tightly linked to change in oceanic mean state rather than to the low-frequency change of atmospheric equatorial variability.
Plan de classement
Sciences du milieu [021]
Localisation
Fonds IRD [F B010044143]
Identifiant IRD
fdi:010044143
Contact