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Registros recuperados: 28
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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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Correction of salinity measured during the Focal experiment IRD
Gouriou, Yves; Reverdin, G.; Penhoat, Yves du.
From july 1982 to august 1984 nine cruises were performed in the intertropical Atlantic ocean as a component of the FOCAL program (Programme Français Océan et Climat Atlantique Equatorial). Profiles of temperature and salinity and oxygen were done with a CTDO probe at the longitude 35°W, 23°W and 4°W, by the R.V. Capricorne and hydrocast measurements were collected at 1°E and 6°E by the R.V. A. Nizery. Systematic differences in salinity measurements taken bythe R.V. Capricorne are apparent when comparing them with other cruises which took place in 1983 or 1984 : salinities are underestimated by the FOCAL cruises at 35°W, 23°W and 4°W. (D'après résumé d'auteur)
Tipo: Text Palavras-chave: TEMPERATURE; SALINITE; OXYGENE; MESURE; VALIDATION DE RESULTAT; CAMPAGNE OCEANOGRAPHIQUE; ETUDE COMPARATIVE.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:010006325
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Dissipation in the Pacific Equatorial long wave model IRD
Picaut, Joël; Menkès, Christophe; Boulanger, Jean-Philippe; Penhoat, Yves du.
Tipo: Text Palavras-chave: HAUTEUR DYNAMIQUE; ONDE ROSSBY; ONDE MARINE; ALTIMETRIE; MODELISATION; ENSO; ONDE KELVIN; SATELLITE GEOSAT.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:39887
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Effect of low latitude Western boundary gaps on the reflection of Equatorial motions IRD
Penhoat, Yves du; Cane, M.A..
The Western Tropical Pacific is thought to be an important zone for generating El Nino : reflections at the boundary make it a potential source region of Equatorial Kelvin waves. Calculations of the effect of a gappy Western boundary on the reflection process are carried out in the framework of the low frequency limit of the shallow water equations and are highly idealized. The method is also applied to a schematic version of the flow through the Indonesian seas from the Western Pacific to the Indian oceans. The results indicate somestrong sensitivities to the location of the gap and to the structure of the incoming flows. In addition, the results can be quite different, depending on whether the zonal extend of the gap is assumed to be infinite or finite....
Tipo: Text Palavras-chave: CIRCULATION OCEANIQUE; EL NINO; ONDE ROSSBY; MODELE; ANALYSE MATHEMATIQUE; ONDE KELVIN; ENSO.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:39885
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Effect of low latitude western boundary gaps on the reflection of equatorial motions IRD
Penhoat, Yves du; Cane, M.A..
The western tropical Pacific is thought to be an important zone for generating EL Nino : reflections at the boundary make it a potential source region of equatorial Kelvin waves. Calculations of the effect of a gappy western boundary on the reflection process are carried out in the framework of the low frequency limit of the shallow water equations and are highly idealized. The method is also applied to a schematic version of the flow through the indonesian seas from the western Pacific to the Indian oceans.
Tipo: Text Palavras-chave: CIRCULATION OCEANIQUE; MODELISATION; APPLICATION; ONDE KELVIN.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:30220
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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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Heat content displacement in the Pacific during the 1982-1983 El Nino event IRD
Donguy, Jean-René; Dessier, Alain; Penhoat, Yves du.
Le contenu thermique intégré de la surface à 300 m de profondeur est calculé dans la partie tropicale de l'Océan Pacifique, en utilisant les données XBT recueillies de 1979 à 1985 le long des lignes de navigation qui coupent l'équateur à 160°E, 160°W et 100°W. L'analyse du contenu thermique montre que pendant El Nino 1982-1983, les parties nord et sud de l'océan tropical ne présentent pas la même évolution à 160°E et 160°W. Par contre, à 100°W, les variations du contenu thermique sont semblables de part et d'autre de l'équateur. Les variations de contenu thermique peuvent être interprétées comme résultant de l'influence d'ondes planétaires, ainsi que le suggèrent des corrélations croisées significatives. Une simulation à l'aide d'un modèle linéaire simple,...
Tipo: Text Palavras-chave: EL NINO; VENT; ANOMALIE; 1982 1983; CONTENU THERMIQUE; MODELE LINEAIRE.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:27190
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Hindcasts of Equatorial sea surface dynamic height in the Atlantic in 1982-1984 IRD
Penhoat, Yves du; Gouriou, Yves.
Two different wind data sets of the years 1982-1984 are used to force in linear multimode model of the Tropical Atlantic ocean. We describe the variations of the Equatorial slope in both cases and investigate the differences betwenthe two runs. The main discrepancy occurs in 1983 for the amplitude of the seasonal signal all along the equator. Models results are also compared with observations (hydrocasts and inverted echo sounders) taken during the Programme Français Océan et Climat dans l'Atlantique Equatorial/Seasonal Response of the Equatorial Atlantic (FOCAL/SEQUAL) field experiment (july 1982 throught october 1984). The contrast between 1983 and 1984 is well captured by the two runs, especially the abnormal flat topography of the sea surface along the...
Tipo: Text Palavras-chave: FACTEUR CLIMATIQUE; VENT; HAUTEUR DYNAMIQUE; MODELE.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:010006321
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Interpretation of Kelvin/Rossby waves in the Equatorial Pacific from model-Geosat data intercomparison during the 1986-1987 El Nino IRD
Penhoat, Yves du; Delcroix, Thierry; Picaut, Joël.
L'analyse du niveau de la mer déduit des mesures du satellite Geosat, pendant la période novembre 1986-novembre 1987, a montré la présence d'ondes longues équatoriales de basse fréquence se propageant dans la majeure partie de l'océan Pacifique équatorial (Delcroix et al., 1991). La succession d'ondes de Kelvin de downwelling et d'upwelling et d'une onde de Rossby d'upwelling soulèveune série de questions. L'onde de Rossby d'upwelling est-elle générée par une réflexion sur le bord est de l'océan ou directement par le forçage du vent au voisinage de l'équateur ? Pourquoi n'observe-t-on pas la réflexion de l'onde de Kelvin de downwelling ? La séquence d'ondes observée est-elle caractéristique de l'évènement El Nino 1986-1987, ou bien peut-elle être détectée...
Tipo: Text Palavras-chave: ALTIMETRIE; DONNEES SATELLITE; SATELLITE METEOROLOGIQUE; ONDE ROSSBY; MODELE; ANALYSE DE DONNEES; EL NINO; ONDE DE KELVIN.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:37900
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Large-scale current and thermohaline structures along 156°E during the COARE intensive observation period IRD
Eldin, Gérard; Delcroix, Thierry; Hénin, Christian; Richards, K.; Penhoat, Yves du; Picaut, Joël; Rual, Pierre.
From December 1992 to February 1993, 18 meridional sections of temperature, salinity, and current were collected along 156°E, from 5°S to 5°N, during the Intensive Observation Period of the Coupled Ocean-Atmosphere Response Experiment. The average conditions were characteristic of the ongoing El Nino event, with a relatively shallow thermocline and fresh surface waters. Alternating westerly and easterly wind forcing was observed, and the warm surface layer (the "Warm forcing was observed, and the warm surface layer (The "Warm Pool") responded in a time scale of a few days by corresponding alternating flows; the Equatorial current system was less affected at depht. The upper-layer oceanic temperature variability involved several mechanisms, including...
Tipo: Text Palavras-chave: COUPLAGE OCEAN ATMOSPHERE; COLLECTE DE DONNEES; TEMPERATURE; SALINITE; COURANT; PROFIL VERTICAL.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:42332
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Large-scale sea surface salinity changes in the western equatorial pacific ocean during 1992-1994 IRD
Hénin, Christian; Penhoat, Yves du; Ioualalen, Mansour; Lukas, R..
Tipo: Text Palavras-chave: INTERACTION OCEAN ATMOSPHERE; EL NINO; EAU DE SURFACE; SALINITE; VARIATION SPATIALE; VARIATION TEMPORELLE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010007167
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Modeled surface dynamic height in 1964-1984 : an effort to assess how well the low frequencies in the Equatorial Atlantic were sampled in 1982-1984 IRD
Reverdin, G.; Penhoat, Yves du.
A wind-forced linear model has been used to produce 21 years (1964--1984) of monthly time series of surface dynamic height in the Equatorial Atlantic. Theclimatological seasonal cycle is substracted, and the statistical characteristics of the residuals are analyzed. An empirical orthogonal function analysis reveals that the most significant pattern has deviations of one sign in the Western Equatorial Atlantic. The anomalies in the last 2 years, 1983 and 1984, are particularly large. The time component of the first empirical orthogonal function peaks in july 1983, changes sign at the end of 1983, and has an extremun of the opposite sign in April 1984. At that time, the zonal slope of dynamic height had reversed with respect to normal along the equator....
Tipo: Text Palavras-chave: CIRCULATION OCEANIQUE; HAUTEUR DYNAMIQUE; ANOMALIE; ANALYSE STATISTIQUE; MODELE.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:010006323
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Modélisation des variations basses fréquences de la circulation dans l'Océan Atlantique tropical IRD
Penhoat, Yves du.
Tipo: Text Palavras-chave: CIRCULATION OCEANIQUE; MODELE MATHEMATIQUE; TOPOGRAPHIE DYNAMIQUE; ONDE PLANETAIRE; VENT; VARIATION SAISONNIERE; ANOMALIE DE TEMPERATURE.
Ano: 1986 URL: http://www.documentation.ird.fr/hor/fdi:23586
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Modélisation numérique d'un océan tropical : application aux variations saisonnières et interannuelles de la topographie de surface dans l'Atlantique IRD
Penhoat, Yves du.
Tipo: Text Palavras-chave: MODELISATION; SIMULATION; CIRCULATION OCEANIQUE; EQUATION DIFFERENTIELLE; MODELE DETERMINISTE.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:27025
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Objective analysis of simulated Equatorial Atlantic ocean data on seasonal time scales IRD
McPhaden, M.J.; Reverdin, G.; Merle, Jacques; Penhoat, Yves du; Kartavseff, A..
In this study we objectively analyze simulated Equatorial Atlantic ocean data on seasonal time scales using a technique based on optimal interpolation. The purpose is twofold : (1) to estimate the accuracy of the FOCAL/SEQUAL (Programme Français Océan-Climat en Atlantique Equatorial/Seasonal Equatorial Atlantic Response Program) array for mapping large-scale seasonal variations in the depth of the 20° isotherm, and (2) to examine the potential of 20 FOCAL drifting buoys drogued with thermistor chains for enhancing that mapping accuracy. This latter point leads to the development of heuristic model for drifter motion in order to identify the most favorable time and location for buoy deployments. Results are discussed for a number of assumptions about...
Tipo: Text Palavras-chave: TEMPERATURE DE SURFACE; COURANT; VARIATION SAISONNIERE; ANALYSE MATHEMATIQUE; VALIDATION DE RESULTAT.
Ano: 1984 URL: http://www.documentation.ird.fr/hor/fdi:010006329
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Objective analysis of thermocline depth distributions obtained in the Tropical Atlantic Ocean during FGGE, 1979 IRD
Reverdin, G.; Molinari, R.; Penhoat, Yves du.
Tipo: Text Palavras-chave: CLIMATOLOGIE; COLLECTE DE DONNEES; TEMPERATURE DE SURFACE; THERMOCLINE; VARIATION SPATIALE; CALCUL SCIENTIFIQUE.
Ano: 1986 URL: http://www.documentation.ird.fr/hor/fdi:010006327
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Profils de température en 1982-1984 : océan Atlantique 25°N-25°S, 60°W-15°E = Temperature profiles in 1982-1984 : Atlantic Ocean 25°N-25°S, 60°W-15°E IRD
Reverdin, G.; Gouriou, Yves; Penhoat, Yves du.
Tipo: Text Palavras-chave: ACQUISITION DE DONNEES; TEMPERATURE; PROFIL VERTICAL.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:010006319
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Rapport de la campagne SURTROPAC 13 à bord du N.O. Le Suroît (1er au 28 décembre 1989) IRD
Penhoat, Yves du; Gallois, François; Langlade, Marie-José; Reverdin, G.; Walico, Henri.
Dans le cadre du programme international TOGA (Tropical Ocean and Global Atmosphere), le Groupe SURTROPAC du Centre ORSTOM de Nouméa a réalisé la campagne SURTROPAC du 1er au 28 décembre qui a permis de décrire la situation hydrologique et le système des courants dans l'océan Pacifique tropical ouest en été austral. 51 stations à la sonde CTD 02 avec prélèvements à la rosette pour la mesure des sels nutritifs et de la chlorophylle et 60 profils de courantométrie ont été faits au cours de cette campagne du N.O. Le Suroît. (Résumé d'auteur)
Tipo: Text Palavras-chave: CAMPAGNE OCEANOGRAPHIQUE; OCEANOGRAPHIE PHYSIQUE; SALINITE; TEMPERATURE; OXYGENE DISSOUS; PHOSPHATE; NITRATE; CHLOROPHYLLE; COURANT; COURANT SUPERFICIEL; THERMOCLINE; EL NINO; ZOOPLANCTON.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:30138
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Rapport de la campagne SURTROPAC 17 à bord du N.O. LE NOROIT (5 août au 2 septembre 1992, de 20°S à 8°N le long du méridien 165°E) IRD
Penhoat, Yves du; Grelet, Jacques; Waigna, Pierre; Blanchot, Jean; Rodier, Martine; Buisson, Bruno.
Dans le cadre du programme international TOGA, la campagne SURTROPAC 17 s'est déroulée du 6 août au 2 septembre 1992, le long du méridien 165°E de 20°S à 8°N. Cette campagne a été réalisée par le groupe ORSTOM-SURTROPAC de Nouméa, Nouvelle Calédonie, avec la participation du groupe ORSTOM-FLUPAC (Nouméa) et du PMEL-NOAA (Seattle). Elle s'est déroulée à bord du navire océanographique nationale. Au cours de la campagne SURTROPAC 17, les travaux suivants ont été effectués : 55 stations à la sonde CTDO2 (0-1000 m) avec prélèvements à la rosette, 48 tirs XBT (T7), des mesures en continu du courant absolu (0-400 m) à l'aide d'un profileur de courant à effet Doppler acoustique, des mesures de la température et de la salinité de surface toute les 5 minutes à...
Tipo: Text Palavras-chave: CAMPAGNE OCEANOGRAPHIQUE; MESURE; COURANT; SEL NUTRITIF; TEMPERATURE DE SURFACE; SALINITE; PROFONDEUR; ANALYSE CHIMIQUE; CHLOROPHYLLE; ZOOPLANCTON; MOUILLAGE; SONDE XBT; BOUEE DERIVANTE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:39600
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Reflection of low frequency Equatorial waves on partial boundaries IRD
Penhoat, Yves du; Cane, M.A.; Patton, R.J..
We develop a linear theory for the effects of partial boundaries on low frequency waves of the kind thought to be important in the seasonal and interannual variations of the equatorial circulation. The Western partial boundary case (e.g. Brazil) differs from the Eastern one (e.g. the Gulf of Guinea) by the presence of short Rossby waves trapped along the North-South part of the boundary which form a boundary current accomplishing the required meridional redistribution of the zonal mass flux. There is a discontinuity in the dynamic topography at the corner of the East-West current at this point. Calculations for the world's equatorial ocean basin shapes are discussed. Calculations carried out for equatorial islands show that propagation of such low...
Tipo: Text Palavras-chave: CIRCULATION OCEANIQUE; TOPOGRAPHIE DYNAMIQUE; ANALYSE MATHEMATIQUE; CALCUL SCIENTIFIQUE; ETUDE THEORIQUE; ONDE KEVIN.
Ano: 1983 URL: http://www.documentation.ird.fr/hor/fdi:010006339
Registros recuperados: 28
Primeira ... 12 ... Última
 

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