Delcroix Thierry, Picaut Joël, Eldin Gérard. (1991). Equatorial Kelvin and Rossby waves evinced in the Pacific ocean through GEOSAT sea level and surface current anomalies. Journal of Geophysical Research, 96 suppl., p. 3249-3262. ISSN 0148-0227.
Titre du document
Equatorial Kelvin and Rossby waves evinced in the Pacific ocean through GEOSAT sea level and surface current anomalies
Année de publication
1991
Type de document
Article
Auteurs
Delcroix Thierry, Picaut Joël, Eldin Gérard
Source
Journal of Geophysical Research, 1991,
96 suppl., p. 3249-3262 ISSN 0148-0227
Equatorial Kelvin and Rossby waves are comprehensively demonstrated over most of the equatorial Pacific basin, through their signatures in sea level and zonal surface geostrophic current anomalies. This was made possible with altimeter data pertaining to the first year of the Geosat (Geodetic Satellite) 17-day exact repeat orbit (November 8, 1986, to November 8, 1987). To this end, along-track corrected Geosat sea level anomalies (SLAs), relative to the time period of interest, were first smoothed using nonlinear and linear filters. The original 17-day time step was then reduced by combining all ascending and descending tracks within 10° longitudinal bands. Finally, SLAs were gridded onto a regular grid, and low-pass filters were applied in latitude and time in order to smooth out remaining high-frequency noise. Anomalies of zonal surface geostrophic current were calculated using the first and second derivatives of the SLA meridional gradient, off and on the equator respectively
Plan de classement
Climatologie / Météorologie [032CLIMET]
;
Dynamique des eaux [032DYNEAU]
Descripteurs
ONDE ROSSBY ; DONNEES SATELLITE ; NIVEAU MARIN ; ANOMALIE ; COURANT SUPERFICIEL ; ONDE KELVIN ; SATELLITE GEOSAT
