Picaut Joël, Camusat Bruno, Delcroix Thierry, McPhaden M.J., Busalacchi A.J. (1989). Surface equatorial flow anomalies in the Pacific ocean during the 1986-87 ENSO using GEOSAT altimeter data. In :
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.). Western Pacific international meeting and workshop on Toga Coare : proceedings. Nouméa : ORSTOM, p. 301-309. Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30.
Titre du document
Surface equatorial flow anomalies in the Pacific ocean during the 1986-87 ENSO using GEOSAT altimeter data
Année de publication
1989
Type de document
Colloque
Auteurs
Picaut Joël, Camusat Bruno, Delcroix Thierry, McPhaden M.J., Busalacchi A.J.
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. 301-309
Colloque
Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30
Estimates of surface geostrophic zonal flow in the equatorial Pacific are deduced from the 17-day exact repeat orbit GEOSAT measurements for the period november 1986-november 1987. This period coincides with the height of the 1986-87 ENSO. Along-track altimeter height anomalies are first smoothed using a combination of linear and non linear filters. By combining several tracks in the zonal direction and filtering in time, we are able to obtain low frequency sea surface height at any point of the tropical Pacific. Currents are calculated from the differentiated form of the meridional momentum equation at the equator and from the classical first derivative of the meridional pressure field away from the equator. Comparisons of low frequency near-surface zonal current directly measured from equatorial moorings at 165°E, 140°W and 110°W yield a correlation of 0.83, 0.84 and 0.50 respectively with a mean rms difference of 0.23 m.s-1. Sea level and zonal velocity solutions from a tropical Pacific numerical model are used as proxy data sets in order to quantify errors induced to quantify the geostrophic calculation by the GEOSAT space-time sampling.
Plan de classement
Dynamique des eaux [032DYNEAU]
Descripteurs
SURFACE MARINE ; COURANT GEOSTROPHIQUE ; ANOMALIE ; SATELLITE GEOSAT ; ENSO ; 1986 1987
Description Géographique
PACIFIQUE EQUATORIAL OUEST
Localisation
Fonds IRD [F A30217] ;
Montpellier (Centre IRD)
;
Nouméa
Identifiant IRD
fdi:30217
