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| Registros recuperados: 28 | |
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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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 |
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| Registros recuperados: 28 | |
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