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Delcroix Thierry, Eldin Gérard, Picaut Joël. (1989). GEOSAT sea level anomalies in the Western equatorial Pacific during the 1986-87 El Nino, elucidated as equatorial Kelvin and Rossby waves. In : Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.). Western Pacific international meeting and workshop on Toga Coare : proceedings. Nouméa : ORSTOM, p. 259-268. Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30.

Titre du document
GEOSAT sea level anomalies in the Western equatorial Pacific during the 1986-87 El Nino, elucidated as equatorial Kelvin and Rossby waves
Année de publication
1989
Type de document
Colloque
Auteurs
Delcroix Thierry, Eldin Gérard, Picaut Joël
In
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.) Western Pacific international meeting and workshop on Toga Coare : proceedings
Source
Nouméa : ORSTOM, 1989, p. 259-268
Colloque
Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30
Thanks to the GEOSAT altimeter data set, information on sea level changes during the 1986-87 El Nino is presented. Special emphasis is placed on the warm pool area, with an evaluation, a detailed description and tentative explanation of the observed Sea Level Anomaly (SLA) changes. Near the 165°E longitude,the onset of the 1986-87 El Nino is characterized by a rapid development of a positive (> 14 cm) equatorial SLA in november-december 1986. This feature occurs in response to an eastward wind anomaly appearing between 140°E-170°W along the equator. The wind induces a downwelling equatorial Kelvin wave with phase speed of about 2.3 m.s.-1. Thereafter, equatorial SLA remains quite constant from january to april/may 1987. In june 1987, equatorial SLA decreases to a minimum value, just after an abrupt change of the zonal wind stress anomaly, west of 165°E. Such anomaly seems to force an upwelling equatorial Kelvin wave propagating at about 2.3. m.s-1.
Plan de classement
Dynamique des eaux [032DYNEAU]
Descripteurs
NIVEAU MARIN ; ANOMALIE ; EL NINO ; ONDE ROSSBY ; 1986 1987
Description Géographique
PACIFIQUE EQUATORIAL OUEST
Localisation
Fonds IRD [F A30213] ; Montpellier (Centre IRD) ; Nouméa
Identifiant IRD
fdi:30213
Contact