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	Provedor de dados 5 (28) Autor Arhan, Michel (28) Mercier, Herle (10) Speich, Sabrina (10) Billant, Andre (5) Branellec, Pierre (5) Dencausse, Guillaume (4) Memery, Laurent (4) Groupe CITHER 2 (3) Alvarez Salgado, Xosé (2) Bingler, Linda (2) Blanke, Bruno (2) Ezraty, Robert (2) Faure, Vincent (2) Groupe CITHER 3 (2) Legeais, Jean-francois (2) Messias, Marie-josé (2) Ollitrault, Michel (2) Ansorge, I (1) Aristegui, Javier (1) Arlen, Linda (1) Mais... Palavra-chave Hydrography (3) Agulhas Current retroflection (2) Altimetry (2) Histoire Ifremer (2) Indo Atlantic exchanges (2) Salinity (2) Water masses (2) Agulhas eddies (1) Agulhas rings (1) Antarctic Circumpolar Current (1) Antarctic circumpolar Current (1) Atlantic deep convection zones (1) Atlantic ocean (1) Baroclinic transport (1) Bottom circulation (1) Boundary current (1) Brazil basin (1) Circulation (1) Current (1) Deep Western Boundary Current (1) Mais... Tipo do documento Text (28) Ano 2013 (1) 2012 (1) 2011 (3) 2010 (3) 2008 (1) 2006 (1) 2005 (1) 2003 (1) 2002 (3) 2000 (2) 1998 (1) 1996 (3) 1995 (1) 1994 (2) 1981 (1) 1978 (1) 1976 (2) Mais... País France (28) Idioma Inglês (20) Francês (8)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 28 Primeira ... 1 2 ... Última A hydrographic section from South Africa to the southern limit of the Antarctic Circumpolar Current at the Greenwich meridian 5 Gladyshev, S; Arhan, Michel; Sokov, A; Speich, Sabrina. The properties and circulation of water masses leaving and entering the Atlantic Ocean south of Africa are examined using data from a hydrographic and Lowered acoustic Doppler current profiler section from South Africa to the southern limit of the Antarctic Circumpolar Current (ACC). At the upper levels, the ACC fronts are well determined using either classical water mass definitions or gradient-based criteria. While the locations of the Subantarctic Front (SAF), Polar Front (PF), and Southern ACC Front (SACCF) seem controlled by the neighbouring ridges, that of the Subtropical Front (STF) is much influenced in this region (similar to 10 degrees E) by northwestward propagating Agulhas rings. No large amount of Subantarctic Mode Water (SAMW) is observed,... Tipo: Text Palavras-chave: Water masses; Fronts; Bottom circulation; Transport; Agulhas eddies; Antarctic Circumpolar Current. Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6097.pdf A Lagrangian numerical investigation of the origins and fates of the salinity maximum water in the Atlantic 5 Blanke, Bruno; Arhan, Michel; Lazar, A; Prevost, Gwenaelle. The origins and fates of the Atlantic salinity maximum water (SMW), formed through excess evaporation in the tropics and subtropics of both hemispheres, are studied using monthly mean outputs of a numerical simulation of the world ocean climatological circulation. After defining formation domains from the surface salinity field and the vertical stratification, a Lagrangian technique is used to estimate the formation rates and main pathways in each hemisphere and the role of this water in the framework of the warm water return flow of the meridional overturning cell. Formation rates around 9 and 11 Sv are found in the Southern and Northern Hemispheres, respectively. While the export of the southern SMW from its formation area is realized by the western... Tipo: Text Palavras-chave: Atlantic ocean; Lagrangian method; Numerical simulation; Salinity; Sea water. Ano: 2002 URL: https://archimer.ifremer.fr/doc/2002/publication-769.pdf Anticyclonic and cyclonic eddies of subtropical origin in the subantarctic zone south of Africa 5 Arhan, Michel; Speich, Sabrina; Messager, Christophe; Dencausse, Guillaume; Fine, Rana; Boye, Marie. Two eddies, one anticyclonic and the other cyclonic, intersected in the Subantarctic Zone south of South Africa during a hydrographic transect, are described using a large set of measurements including full depth hydrography, Acoustic Doppler Current Profiler velocities, biogeochemical tracers, air-sea fluxes and altimetric sea surface height. Both eddies have a subtropical origin. The anticyclone is an Agulhas ring with convected core water of similar to 12 degrees C, and swirl velocities of 1 m s(-1). It was 9.5 months old when sampled and had crossed the Agulhas Ridge. Though sampled in summer, it was releasing similar to 200 W m(-2) (sensible plus latent heat flux) to the atmosphere. It was observed adjacent to the Subantarctic Front, illustrating the... Tipo: Text Ano: 2011 URL: http://archimer.ifremer.fr/doc/00051/16220/13745.pdf Bottom water throughflows at the Rio de Janeiro and Rio Grande Fracture Zones 5 Mercier, Herle; Weatherly, Georges; Arhan, Michel. Bottom water throughflows at the Rio de Janeiro Fracture Zone (22 degrees S) and Rio Grande Fracture Zone (26 degrees S) of the Mid-Atlantic Ridge are identified from hydrographic anomalies observed along 9 degrees W in the Angola Basin. The throughflow water is supplied by a meridional band of cold and fresh water lying against the western flank of the Ridge. Tipo: Text Palavras-chave: Fractures and faults; Structural geology; Hydrography; General circulation; Physical oceanography. Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-491.pdf Campagne CITHER 1 N.O. l'Atalante (2 janvier - 19 mars 1993). Recueil de Données. Volume 2 : CTD-O2 5 Colin, Christian; Morliere, Alain; Oudot, Claude; Arhan, Michel; Billant, Andre; Branellec, Pierre; Mercier, Herle; Groupe CITHER 1. De janvier à mars 1993 s'est déroulée la campagne CITHER 1 du programme WOCE-France, dans le but d'estimer et analyser les échanges inter-hémisphériques océaniques dans l'océan Atlantique. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond, à 223 stations situées le long de deux radiales transocéaniques à 4°30' S et 7°30' N,et , entre ces latitudes, le long des méridiens 35° W et 4° W. Ce volume, qui est le deuxième volume de la série des recueils de données CITHER 1, présente les mesures des paramètres de la bathysonde (pression, température, salinité et oxygène dissous). Les mesures des autres paramètres (paramètres "en route" et paramètres géochimiques) seront trouvés... Tipo: Text Ano: 1994 URL: http://archimer.ifremer.fr/doc/00236/34678/33045.pdf Campagne CITHER 2 N/O Maurice Ewing (4 janvier-21 mars 1994). Recueil de Données. Volume 1 : Mesures "En route". Paramètres Météorologiques, Bathymétrie et Courantométrie Doppler 5 Memery, Laurent; Arhan, Michel; Daniault, Nathalie; Hemon, Catherine; Mercier, Herle; Chipman, David W.; Groupe CITHER 2. De janvier à Mars 1994 s'est déroulée la campagne CITHER 2 du programme WOCE-France, dans le but d'étudier les écoulements le long du bord Ouest de l'Océan Atlantique Sud. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond, à 235 stations situées le long d'une radiale quasi-méridienne allant de 52° S à 10° N à environ 600 km du talus continental et, transversalement à cette radiale, le long de trois segments allant jusqu'au talus continental à environ 35° S, 13° S, et 10° N. Ce rapport, qui est le premier des trois recueils de données CITHER 2, contient une brève description générale du programme CITHER et de la campagne CITHER 2, suivie d'une présentation des paramètres "en... Tipo: Text Ano: 1996 URL: http://archimer.ifremer.fr/doc/00238/34905/33175.pdf Campagne CITHER 2 N/O Maurice Ewing (4 janvier-21 mars 1994). Recueil de Données. Volume 2 : Données CTD-O2 5 Memery, Laurent; Arhan, Michel; Billant, Andre; Branellec, Pierre; Mercier, Herle; Groupe CITHER 2. De janvier à Mars 1994 s'est déroulée la campagne CITHER 2 du programme WOCE-France, dans le but d'étudier les écoulements le long du bord Ouest de l'Océan Atlantique Sud. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond, à 235 stations situées le long d'une radiale quasi-méridienne allant de 52° S à 10° N à environ 600 km du talus continental et, transversalement à cette radiale, le long de trois segments allant jusqu'au talus continental à environ 35° S, 13° S, et 10° N. Ce rapport, qui est le deuxième volume de la série des recueils de données CITHER 2, présente les mesures des paramètres de la bathysonde (pression, température, salinité, et oxygène dissous). Les... Tipo: Text Ano: 1995 URL: http://archimer.ifremer.fr/doc/00238/34906/33180.pdf Campagne CITHER 2 N/O Maurice Ewing (4 janvier-21 mars 1994). Recueil de Données. Volume 3 : Traceurs Géochimiques 5 Memery, Laurent; Messias, Marie-josé; Arhan, Michel; Billant, Andre; Branellec, Pierre; Mercier, Herle; Alvarez Salgado, Xosé; Gonzales Castro, Carmen; Rios, Aida F.; Roson, Gabriel; Arlen, Linda; Bingler, Linda; Groupe CITHER 2. De janvier à Mars 1994 s'est déroulée la campagne CITHER 2 du programme WOCE-France, dans le but d'étudier les écoulements le long du bord Ouest de l'Océan Atlantique Sud. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond, à 235 stations situées le long d'une radiale quasi-méridienne allant de 52° S à 10° N à environ 600 km du talus continental et, transversalement à cette radiale, le long de trois segments allant jusqu'au talus continental à environ 35° S, 13° S, et 10° N. Ce rapport, qui est le troisième volume de la série des recueils de données CITHER 2, présente les mesures des paramètres géochimiques mesurés sur prélèvements d'eau (salinité, oxygène dissous, sels... Tipo: Text Ano: 1996 URL: http://archimer.ifremer.fr/doc/00238/34907/33185.pdf Campagne CITHER 3 N/O l'Atalante (11 janvier - 2 avril 1995). Recueil de données. Volume 2 : Données CTD-O2 5 Arhan, Michel; Billant, Andre; Branellec, Pierre; Mercier, Herle; Groupe CITHER 3. De mi-janvier à début avril 1995 s'est déroulée la campagne CITHER 3 du programme WOCE-France, dans le but d'étudier les écoulements aux frontières méridiennes du bassin Atlantique Sud-Est: à l'ouest les échanges avec les Bassins d'Argentine et du Brésil, et à l'est les écoulements le long du talus continental Africain. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond à 242 stations situées le long de deux radiales, l'une à 9° W entre le talus continental Ivoirien et la latitude 45° S, l'autre de Cape Town à la position 40° S - 10° E, puis au talus continental Ghanéen. Ce rapport, qui est le deuxième volume de la série des recueils de données CITHER 3, présente les mesures... Tipo: Text Ano: 1996 URL: http://archimer.ifremer.fr/doc/00238/34919/33288.pdf Campagne CITHER 3 N/O l'Atalante (11 janvier - 2 avril 1995). Recueil de données. Volume 3 : Traceurs Géochimiques 5 Arhan, Michel; Billant, Andre; Branellec, Pierre; Mercier, Herle; Memery, Laurent; Messias, Marie-josé; Morin, Pascal; Wafar, Mohideen; Alvarez Salgado, Xosé; Aristegui, Javier; Gonzalez-davila, Melchor; Pazo Fernandez, Maria José; Rellan, Trinidad; Rios, Aida; Bingler, Linda; Groupe CITHER 3. De mi-janvier à début avril 1995 s'est déroulée la campagne CITHER 3 du programme WOCE-France, dans le but d'étudier les écoulements aux frontières méridiennes du bassin Atlantique Sud-Est: à l'ouest, les échanges avec les Bassins d'Argentine et du Brésil, et à l'est, les écoulements le long du talus continental Africain. Les paramètres hydrologiques et géochimiques requis par le Programme Hydrologique de WOCE (WHP) ont été mesurés de la surface au fond à 242 stations situées le long de deux radiales, l'une à 9° W entre le talus continental Ivoirien et la latitude 45° S, l'autre de Cape Town à la position 40° S - 10° E, puis au talus continental Ghanéen. Ce rapport, qui est le troisième volume de la série des recueils de données CITHER 3, présente les... Tipo: Text Ano: 1998 URL: http://archimer.ifremer.fr/doc/00238/34920/33291.pdf Circulation at the western boundary of the South and Equatorial Atlantic: Exchanges with the ocean interior 5 Wienders, Nicolas; Arhan, Michel; Mercier, Herle. Data from a hydrographic section carried out in January-March 1994 offshore from the eastern coast of South America from 50S to 10N, are used to quantify the full-depth exchanges of water between the western boundary currents and the ocean interior. In the upper and intermediate layers, the westward transport associated with the southern branch of the South Equatorial Current was 49 Sv at the time of the cruise. The transports of the central and northern branches in the upper 200 m were 17 Sv and 12 Sv, respectively. After subtraction of the parts that recirculate in the subtropical, subequatorial, and equatorial domains, the fraction of the South Equatorial Current that effectively contributes to the warm water export to the North Atlantic is estimated at... Tipo: Text Palavras-chave: South equatorial Atlantic; Boundary current; Oceanic circulation. Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-803.pdf Deep lenses of circumpolar water in the Argentine Basin - art. no. 3007 5 Arhan, Michel; Carton, Xavier; Piola, A; Zenk, W. [1] Three deep anticyclonic eddies of a species only reported once before [Gordon and Greengrove, 1986] were intersected by hydrographic lines of the World Ocean Circulation Experiment (WOCE) and South Atlantic Ventilation Experiment (SAVE) programs in the Argentine Basin. The vortices are centered near 3500 m depth at the interface between North Atlantic Deep Water and Bottom Water. They have similar to1500-m-thick cores containing Lower Circumpolar Deep Water and a dynamical influence that may span up to two thirds of the water column. As one eddy was observed just downstream of the western termination of the Falkland Escarpment, a destabilization of the deep boundary current by the sudden slope relaxation is suggested as a potential cause of eddy... Tipo: Text Palavras-chave: Eddies and mesoscale processes; Western boundary currents; Hydrography. Ano: 2002 URL: https://archimer.ifremer.fr/doc/00000/10057/7797.pdf Evidence of abyssal eddies in the Brazil Basin - art. no. 3027 5 Weatherly, G; Arhan, Michel; Mercier, Herle; Smethie, W. [1] We report evidence of two deep cyclonic and two deep anticyclonic submesoscale eddies from World Oceanographic Circulation Experiment hydrographic casts made in the Brazil Basin. We infer that three of these were likely formed in or near the Deep Western Boundary Current (DWBC) of North Atlantic Deep Water (NADW), and thus had traveled eastward after formation. These eddies appear to be a new way for transporting NADW away from the DWBC to the ocean interior. One of the apparent cyclonic eddies appeared to be laterally in contact with one of the anticyclonic eddies. About 10 days later an attempt was made to resample the apparent eddies that had been in contact. These observations, although limited, are interpreted to indicate that they survived the... Tipo: Text Palavras-chave: Eddies; Deep Western Boundary Current; Eddy merging. Ano: 2002 URL: https://archimer.ifremer.fr/doc/00000/10051/7796.pdf Heat budget of the surface mixed layer south of Africa 5 Faure, Vincent; Arhan, Michel; Speich, Sabrina; Gladyshev, Sergey. ARGO hydrographic profiles, two hydrographic transects and satellite measurements of air-sea exchange parameters were used to characterize the properties and seasonal heat budget variations of the Surface Mixed Layer (SML) south of Africa. The analysis distinguishes the Subtropical domain (STZ) and the Subantarctic Zone (SAZ), Polar Frontal Zone (PFZ) and Antarctic Zone (AZ) of the Antarctic Circumpolar Current. While no Subantarctic Mode Water forms in that region, occurrences of deep SML (up to similar to 450 m) are observed in the SAZ in anticyclones detached from the Agulhas Current retroflection or Agulhas Return Current. These are present latitudinally throughout the SAZ, but preferentially at longitudes 10-20A degrees E where, according to previous... Tipo: Text Palavras-chave: Ocean surface mixed layer; Heat budget; Southern Ocean; Agulhas Current retroflection. Ano: 2011 URL: http://archimer.ifremer.fr/doc/00048/15953/15833.pdf Is there a continuous Subtropical Front south of Africa? 5 Dencausse, Guillaume; Arhan, Michel; Speich, Sabrina. A 14.3 year series of weekly absolute sea surface height (SSH) and associated geostrophic velocities is used for a study of the subtropical-to-subantarctic frontal system in the region south of Africa. Detecting the fronts from surface velocity maxima confirms a two-stepped transition in both the southeastern Atlantic Ocean (the Northern and Southern Subtropical fronts (NSTF, SSTF)) and southwestern Indian Ocean (the Agulhas Front and SSTF), as proposed previously from hydrographic data. An additional front associated with westward flow north of the NSTF is indicative of a partial eastern closure of the South Atlantic subtropical gyre between 11°E and 17.5°E. The role of northwestward propagating Agulhas rings in connecting the two fronts explains the... Tipo: Text Ano: 2011 URL: http://archimer.ifremer.fr/doc/00030/14096/11323.pdf Lagrangian observations in the Intermediate Western Boundary Current of the South Atlantic 5 Legeais, Jean-francois; Ollitrault, Michel; Arhan, Michel. Subsurface float measurements at 800 m depth carried out from 1994 to 2003 in the Brazil Basin are used to characterise the equatorward Intermediate Western Boundary Current (IWBC) and its connections to the ocean interior. Transversally, the boundary flow is less than 100 km wide, and most intense at 10-20 km from the 800 m isobath. Its average velocities range from similar to 0.1 ms(-1) to 0.3 ms(-1) depending on latitude, with individual daily values as high as 0.7 ms(-1). The flow meridional extent exhibits 3 contrasted domains: (i) from 27 degrees S to the Vitoria-Trindade Ridge at 20 degrees 30'S, the boundary flow intensifies northward along a relatively smooth topography. A counter current adjacent to it on its seaward side feeds it with... Tipo: Text Palavras-chave: Brazil basin; Intermediate water; Western boundary current. Ano: 2013 URL: https://archimer.ifremer.fr/doc/00134/24561/22690.pdf Non-linear deformation of sea-wave profiles in intermediate and shallow water 5 Arhan, Michel; Plaisted, Ro. The present paper is a study of the nonlinear deformations of sea-wave profiles in intermediate (20 m depth) and shallow (4 m) water, based on wave staff and bottom pressure in situ measurements. The nonlinear deformations have been decomposed into two elementary classes : asymmetry with respect to the mean water surface and asymmetry with respect to a vertical line passed through the wave crest. The extend of the deformation of the first kind is estimated by computing the experimental statistical distributions of wave crest heights and through depths. These distributions are shown to deviate from the Rayleigh law (applicable to linear sea states), and are well fitted by a second order perturbation model deduced from the Stokes theory. The second kind of... Tipo: Text Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-5322.pdf Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre 5 Chever, Fanny; Bucciarelli, Eva; Sarthou, G.; Speich, Sabrina; Arhan, Michel; Penven, Pierrick; Tagliabue, A.. [1] Distributions of total dissolvable iron (TDFe; unfiltered), dissolved iron (DFe; 0.2 mu m filtered), and soluble iron (SFe; 0.02 mu m filtered) were investigated during the BONUS-GoodHope cruise in the Atlantic sector of the Southern Ocean (34 degrees S/17 degrees E-57 degrees S/0 degrees, February-March 2008). In the mixed layer, mean values of 0.43 +/- 0.28 and 0.22 +/- 0.18 nmol L-1 were measured for TDFe and DFe, respectively. In deeper waters, TDFe and DFe concentrations were 1.07 +/- 0.68 and 0.52 +/- 0.30 nmol L-1, respectively. DFe concentrations decreased from the north (subtropical waters) to the south (Weddell Sea Gyre). In the subtropical domain, dusts coming from Patagonia and southern Africa and inputs from the African continental margin... Tipo: Text Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12808/9763.pdf Relation statistique entre hauteur et période des vagues de tempête 5 Arhan, Michel; Cavanie, Alain; Ezraty, Robert. A theoretical model of composed probability density of wave height and period is based on the results of Cartwright and Longuet-Higgins on the maximums of a Gaussian random function of order two of narrow spectrum. The concordance with experiment is satisfactory, even for wide spectrums, in the case of recordings of storms in the North Sea. Tipo: Text Palavras-chave: Histoire Ifremer. Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5190.pdf Relations entre les variations de pression au fond et les courants particulaires dans la houle côtière proche du déferlement 5 Arhan, Michel; Gouriten, Yves. In situ recordings of pressure near the bottom and particle velocity in shallow water reveal the non-linear nature of the flow in the breaker zone. The different frequency domains linked to nearshore currents, wind waves, and turbulence are determined using correlations and coherences. A quasi-linear pressure-velocity relation exists in the wind wave frequency range. [NOT CONTROLLED OCR] Tipo: Text Palavras-chave: Histoire Ifremer. Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5077.pdf Registros recuperados: 28 Primeira ... 1 2 ... Última

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