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Registros recuperados: 14
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A model study of potential sampling errors due to data scatter around expendable bathythermograph transects in the Tropical Pacific IRD
McPhaden, M.J.; Busalacchi, A.J.; Picaut, Joël; Raymond, G..
We describe a series of sampling sensitivy experiments to examine potential errors due to data scatter around expendable bathythermograph (XBT) transects in the tropical Pacific. We use a linear, multiple vertical mode model forced with three differrent monthly mean wind stress sets for the period 1979-1983. The model is sampled along approximately straight lines of grid points corresponding to the mean positions of XBT tracks in the eastern, central, and western Pacific and then sampled again at the dates and location of actual XBT casts for 1979-1983. Model dynamic heights are calculated with a resolution of 1° of latitude and 1 month, then processed to a monthly mean seasonal cycle and anomalies associated with the 1982-1983 El Nino. When results are...
Tipo: Text Palavras-chave: ACQUISITION DE DONNEES; OCEANOGRAPHIE PHYSIQUE; TOPOGRAPHIE DYNAMIQUE; MODELE; XBT.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:30106
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Application of TOPEX/POSEIDON altimetry measurements to observational and modeling studies of the low-frequency upper ocean mass and heat circulation in the Tropical Pacific IRD
Picaut, Joël; Delcroix, Thierry; Penhoat, Yves du; Busalacchi, A.J.; Gautier, G.; Hayes, S.P.; McPhaden, M.J..
Tipo: Text Palavras-chave: MASSE D'EAU; FLUX THERMIQUE; MESURE; ALTIMETRIE; COURANT; MODELE.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:42383
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Contrasting the evolution of the 1986-1989 and 1992-1993 ENSO events IRD
Menkès, Christophe; Busalacchi, A.J..
Tipo: Text Palavras-chave: INTERACTION OCEAN ATMOSPHERE; EL NINO; TEMPERATURE DE SURFACE; VENT; NIVEAU MARIN; COURANT GEOSTROPHIQUE; ANOMALIE; ACQUISITION DE DONNEES; SATELLITE GEOSTATIONNAIRE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010007159
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ENSO and altimetry IRD
Picaut, Joël; Boulanger, J.P.; Busalacchi, A.J.; Delcroix, Thierry; Gourdeau, Lionel; McPhaden, M.J.; Menkès, Christophe; Penhoat, Yves du.
Tipo: Text Palavras-chave: INTERACTION OCEAN ATMOSPHERE; EL NINO; NIVEAU MARIN; COURANT GEOSTROPHIQUE; SATELLITE GEOSTATIONNAIRE; ALTIMETRIE; CIRCULATION OCEANIQUE; ACQUISITION DE DONNEES; MODELISATION.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010007157
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Interannual variability versus seasonal variability in the tropical Atlantic IRD
Picaut, Joël; Servain, J.; Busalacchi, A.J.; Seva, M..
Tipo: Text Palavras-chave: OCEAN; VENT; TEMPERATURE DE SURFACE; ANOMALIE DE TEMPERATURE; VARIATION INTERANNUELLE; VARIATION SAISONNIERE.
Ano: 1984 URL: http://www.documentation.ird.fr/hor/fdi:010025545
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Observations and wind-forced model simulations of the mean seasonal cycle in tropical Pacific sea surface topography IRD
McPhaden, M.J.; Busalacchi, A.J.; Picaut, Joël.
We examine simulations of the mean seasonal cycle in the tropical Pacific using a multiple vertical mode linear numerical model forced with three different surface wind stress products average over the period 1979-1981. The model is run to equilibrium for each four vertical modes, and results are summed. Simulated mean seasonal cycles in dynamic height and sea level are then compared with observed variations based on expendable bathythermograph and island tide gauge data averaged over the same 1979-1981 period. All simulations show characteristic features of the mean meridional ridge-through structure in surface topography. However, north and south equatorial ridges at 20°N and 20°S are much higher than those observed, only weak equatorial ridges are...
Tipo: Text Palavras-chave: OCEANOGRAPHIE PHYSIQUE; ACQUISITION DE DONNEES; VENT; NIVEAU MARIN; SURFACE MARINE; MODELISATION.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:30110
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Open-ocean validation of TOPEX/POSEIDON sea level in the western equatorial Pacific IRD
Picaut, Joël; Busalacchi, A.J.; McPhaden, M.J.; Gourdeau, Lionel; Gonzales, F.I.; Hackert, E.C..
Tipo: Text Palavras-chave: NIVEAU MARIN; VARIATION TEMPORELLE; FREQUENCE; DYNAMIQUE DE L'EAU; ACQUISITION DE DONNEES; TRAITEMENT DE DONNEES.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010006157
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Rigorous open-ocean validation of TOPEX/POSEIDON sea level in the Western Equatorial Pacific IRD
Picaut, Joël; Busalacchi, A.J.; Delcroix, Thierry; McPhaden, M.J..
A series of 12 meridional transect along longitude 165°E in the Western Equatorial Pacific ocean were made between mid-1986 and mid-1988 : a time interval spanning an El Nino/Southern Oscillation (ENSO) event. Data collected on these cruises provide a detailed (albeit temporally sparse) view of the oceanic changes which occur in the Western Pacific during an ENSO event. The present work focuses on the evolution of the upper ocean thermohaline and zonal velocity fields as revealed by high resolution hydrographic casts and direct near surface velocity measurements. Onset of the El Nino was characterized by anomalous eatsward transport of warm surface waters equatorward of 10° latitude (where anomalies are relative to a mean state defined by historical...
Tipo: Text Palavras-chave: EL NINO; COUPLAGE OCEAN ATMOSPHERE; NIVEAU MARIN; HAUTEUR DYNAMIQUE; VARIATION INTERANNUELLE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:42384
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Sensitivity of wind-driven Tropical Pacific simulations on seasonal and interannuel time scales IRD
Busalacchi, A.J.; McPhaden, M.J.; Picaut, Joël; Springer, S.R..
The purposes of this study are to characterize differences in the time/space structure of various multiyear surface wind products for the Tropical Pacific and to quantify the impact these differences may have on our ability to model oceanic wind-forced variability on seasonal and interannual time scales. Three coincident wind field analyses are used, viz. the Florida State University (FSU) subjective analysis, the University of Hawaii (SAWIN) subjective analysis and the Fleet Numerical Oceanography Center (FNOC) operational analysis. The five years chosen for study, 1979-1983, encompass three years of a fairly regular seasonal cycle leading up to the 1982-1983 El Nino. A linear multi-vertical model is forced with these analyses; model dynamic height and...
Tipo: Text Palavras-chave: CLIMATOLOGIE; NIVEAU MARIN; EL NINO; VARIATION SAISONNIERE; VARIATION INTERANNUELLE; MODELISATION; CHAMP DE VENT.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:34220
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Surface equatorial flow anomalies in the Pacific ocean during the 1986-87 ENSO using GEOSAT altimeter data IRD
Picaut, Joël; Camusat, Bruno; Delcroix, Thierry; McPhaden, M.J.; Busalacchi, A.J..
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...
Tipo: Text Palavras-chave: SURFACE MARINE; COURANT GEOSTROPHIQUE; ANOMALIE; SATELLITE GEOSAT; ENSO; 1986 1987.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:30217
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The impact of TOGA TAO wind observations on tropical pacific ocean simulations IRD
Menkès, Christophe; Busalacchi, A.J..
Tipo: Text Palavras-chave: INTERACTION OCEAN ATMOSPHERE; EL NINO; VENT; NIVEAU MARIN; ANOMALIE; PROGRAMME DE RECHERCHE; RESULTAT ANALYTIQUE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010007151
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Uncertainties in tropical Pacific ocean simulations : the seasonal and interannual sea level response to three analyses of the surface wind field IRD
Busalacchi, A.J.; McPhaden, M.J.; Picaut, Joël; Springer, S..
The purpose of this study is to characterize differences in the time/space structure present among conventionnal descriptions of the tropical Pacific surface wind field, and in turn, to quantify the impact of these differences on our ability to model the dominant wind-forced variability of the tropical Pacific ocean on seasonal and interannual time scales. A linear, multiple vertical mode ocean model is used as a transfer function to determine the influence of three distinct surface wind stress products for the period 1979-1983. This five-year period was chosen for study because it encompasses three years of a fairly regular seasonal cycle leading up to the 1982-83 El Nino for which there are several coincident oceanic and surface wind data sets. The three...
Tipo: Text Palavras-chave: NIVEAU MARIN; VARIATION SAISONNIERE; VARIATION INTERANNUELLE; VENT; MODELISATION.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:30223
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Validation of the geostrophic method for estimating zonal currents at the Equator from Geosat altimeter data IRD
Picaut, Joël; Busalacchi, A.J.; McPhaden, M.J.; Camusat, Bruno.
The applicability of satellite altimeter data for estimating zonal current variability at the equator is assessed using the meridionally differenced form of the geostrophic balance. Estimates of geostrophic zonal flow anomalies in the Equatorial Pacific have been deduced from 17-day collinear altimeter data during the first year of the Geosat exact repeat mission, November 1986 to November 1987. Altimeter-derived geostrophic estimates agree well with in situ zonal current variability. Comparison of low-frequency, near surface zonal current observed from equatorial moorings at 165°E, 140°W, and 110°W yield correlations of 0.83, 0.85 and O.51, respectively, with a mean rms difference of 23 cm s-1
Tipo: Text Palavras-chave: COURANT GEOSTROPHIQUE; DONNEES SATELLITE; MODELE MATHEMATIQUE; SATELLITE GEOSAT.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:34274
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Variability in Equatorial Pacific sea surface topography during the verification phase of the Topex/Poseidon mission IRD
Busalacchi, A.J.; McPhaden, M.J.; Picaut, Joël.
As part of the verification phase of the TOPEX/POSEIDON mission, 10-day gridded fields of altimeter data derived from TOPEX geophysical data records are compared with 10-day gridded fields of dynamic height derived from more than 60 moorings of the Tropical Ocean and Global Atmosphere-Tropical Atmosphere Ocean (TOGA-TAO) array in the Equatorial Pacific ocean. Acess to TAO data in real time permits the first 500 days of the TOPEX/POSEIDON mission to be placed in the context of complementary, in situ measurements of surface winds, sea surface temperatures, and upper ocean thermal structure, as well as the time history of these variables prior to lauch. Analysis of the space-time structure in the TOPEX and TAO surface topography data indicates sea level...
Tipo: Text Palavras-chave: ACQUISITION DE DONNEES; ALTIMETRIE; SURFACE MARINE; VENT; TEMPERATURE DE SURFACE; FLUX THERMIQUE; NIVEAU MARIN; HAUTEUR DYNAMIQUE; EL NINO.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:42803
Registros recuperados: 14
Primeira ... 1 ... Última
 

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