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A four-dimensional analysis of the thermal structure in the Gulf of Lion ArchiMer
Gaillard, Fabienne; Desaubies, Yves; Send, Uwe; Schott, Fritz.
The Theoretical and Experimental Tomography in the Sea Experiment (THETIS 1) took place in the Gulf of Lion to observe the evolution of the temperature field and the process of deep convection during the 1991-1992 winter. The temperature measurements consist, of moored sensors, conductivity-temperature-depth and expendable bathythermograph surveys, ana acoustic tomography. Because of this diverse data set and since the field evolves rather fast, the analysis uses a unified framework, based on estimation theory and implementing a Kalman filter. The resolution and the errors associated with the model are systematically estimated. Temperature is a good tracer of water masses. The time-evolving three-dimensional view of the field resulting from the analysis...
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Ano: 1997 URL: http://archimer.ifremer.fr/doc/00336/44704/44916.pdf
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Acoustic Tomography in the Canary Basin: Meddies and Tides ArchiMer
Dushaw, Brian; Gaillard, Fabienne; Terre, Thierry.
An acoustic propagation experiment over 308-km range conducted in the Canary Basin in 1997–1998 was used to assess the ability of ocean acoustic tomography to measure the flux of Mediterranean water and Meddies. Instruments on a mooring adjacent to the acoustic path measured the southwestward passage of a strong Meddy in temperature, salinity, and current. Over nine months of transmissions, the acoustic arrival pattern was an initial broad stochastic pulse varying in duration by 250 to 500 ms, followed eight stable, identified ray arrivals. Small-scale sound speed fluctuations from Mediterranean water parcels littered around the sound channel axis caused acoustic scattering. Internal waves contributed more modest acoustic scattering. Based on simulations,...
Tipo: Text Palavras-chave: Meddy; Acoustic tomography; Canary Basin; Mediterranean water; Internal tides.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00404/51519/52112.pdf
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ARGO based statistics for climate monitoring ArchiMer
Gaillard, Fabienne; Reynaud, Thierry; Von Schuckmann, Karina; Roquet, Fabien; Prigent, Annaig; Lagadec, Catherine.
The Argo array, by offering simultaneously global coverage and high vertical resolution, made the monitoring of inter-annual and decadal variability of the ocean interior possible. In the ARIVO project, we have initiated the production of gridded monthly fields of temperature and salinity using an optimal analysis tool and designed an iterative approach to combine near-real time and delayed mode data. The monthly gridded fields are averaged over time to produce the reference state needed by climatological studies, dynamical modeling and reconstruction methods themselves. Higher degree statistics such as variances and extreme values are later derived. Global indices (heat content, dynamical height) and corresponding error bars are also computed. Sensitivity...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00112/22355/20035.pdf
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Argo workshop in Ghana, December 2006 ArchiMer
Pouliquen, Sylvie; Thierry, Virginie; Coatanoan, Christine; Gaillard, Fabienne; Poulain, Pm; Carval, Thierry.
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Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-6147.pdf
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Bay of Biscay’s temperature and salinity climatology : Bobyclim ArchiMer
Vandermeirsch, Frederic; Charraudeau, Romain; Bonnat, Armel; Fichaut, Michele; Maillard, Catherine; Gaillard, Fabienne; Autret, Emmanuelle.
The Bay of Biscay climatology is the synthesis of all the in situ data collected in the bay of Biscay area as far as 15°W, in the 20th century and mainly by IFREMER, SHOM, and WDCA. It shows temperature and salinity monthly information through the whole water column with a 1/10 degree resolution. The resulting atlas was produced by an optimal analysis which can reflect different scales: shelf and abyssal plain. A fine scale on the coast reveals all the local effects, including plume and upwelling, and a large scale on the shelf where a slower signal is obtained due to the large scale circulation
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00029/14039/11232.pdf
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CAMBIOS - Contribution à CANIGO ( MAS3-CT96-0060 ) - Volume 2 : Expérience CAMBIOS - Rapport des données eulériennes sur les 4 mouillages ArchiMer
Gaillard, Fabienne; Billant, Andre; Branellec, Pierre.
Dans le cadre du projet CAMBIOS, une première campagne (CAMBIOS 97) a été organisée sur le N/O Thalassa du 1er juillet au 2 août 1997. Cette campagne était programmée pour la mise en place d'un réseau de mouillages instrumentaux. Ceux-ci ont été relevés par le même navire au cours d'une deuxième campagne (CAMBIOS 98) entre le 23 avril et le 11 mai 1998. Par ailleurs, deux réseaux complémentaires de mesures d'hydrologie ont été réalisés au cours de ces campagnes: les résultats des mesures CTDO2 de la campagne CAMBIOS 97 ont été publiés dans le rapport interne LPO 98/02, ceux de la campagne CAMBIOS 98 seront publiés dans un prochain rapport interne. L'objet du présent rapport est la présentation des séries temporelles de mesures classiques obtenues pendant...
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Ano: 1999 URL: http://archimer.ifremer.fr/doc/00233/34397/32793.pdf
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CAMBIOS. Contribution à CANIGO (MAS3-CT96-0060). Volume 6 : Expérience CAMBIOS. Rapport des données de tomographie ArchiMer
Terre, Thierry; Gaillard, Fabienne.
CAMBIOS est un projet d’étude de la circulation dans le bassin des Canaries , il contribue au programme européen CANIGO. La circulation dans cette partie du bassin Est de l’Atlantique est influencée par deux facteurs : le courant des Açores qui arrive du bassin ouest après avoir franchi la dorsale médio-atlantique et l’eau méditerranéenne qui progresse de Gibraltar vers l’ouest. L’objectif premier du projet est de préciser la contribution des meddies au transport de sel à grande échelle. Le second objectif est de constituer un ensemble de mesures sur l’intérieur de l’océan, complémentaire des mesures altimétriques, ce qui permettra de décrire l’évolution de la structure tridimensionnelle du système front-courant des Açores. Le travail sur zone s’est...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00312/42331/41660.pdf
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CAMBIOS Contribution à CANIGO (MAS3-CT96-0060). Volume 7 : Expérience CAMBIOS. Traitement des données de tomographie ArchiMer
Gaillard, Fabienne; Terre, Thierry.
La donnée primaire de tomographie est constituée de l’ensemble des réceptions acquises par les récepteurs. Il convient d’extraire de ces réceptions les temps d’arrivée des différents rayons acoustiques se propageant entre la source et le récepteur. Les variations des temps d’arrivée de ces rayons contiennent l’information relative aux variations du milieu. La constitution de séries temporelles des temps d’arrivée et l’identification de chaque série à un rayon acoustique sont des étapes nécessaires pour obtenir par inversion de ces données les variations spatio-temporelles du milieu. Les données sont décrites dans [1] et représentées Figure 1 à Figure 4. Nous avons retenu le seul canal 2 car il est de meilleure qualité en terme de rapport signal à bruit que...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00312/42332/41661.pdf
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CAMBIOS Contribution à CANIGO (MAS3-CT96-0060). Volume 8 : Expérience CAMBIOS. Analyse des données de tomographie ArchiMer
Gaillard, Fabienne; Terre, Thierry.
L’objectif est de constituer une base de temps d’arrivée calculés par tracé de rayons en utilisant des profils de vitesse du son issus de mesures effectuées sur zone. Ces prédictions disponibles, il conviendra de les confronter aux observations pour mettre en relation un motif d’arrivée observé à un motif d’arrivée prédit soit encore à un contenu en salinité du profil. L’espace des paramètres que nous utilisons pour classer les observations est constitué de 5 temps d’arrivée T1, T2, T3, T4, T5 et T8. Une représentation de cet espace est obtenue en effectuant des diagrammes Ti/Tj pour chaque combinaison possible des temps d’arrivée. Pour classer les observations nous calculons la distance euclidienne de chaque vecteur observation constitué des rayons pris...
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Ano: 2004 URL: http://archimer.ifremer.fr/doc/00312/42333/41662.pdf
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CAMBIOS, Station profiles: CTD and LADCP ArchiMer
Gaillard, Fabienne; Lherminier, Pascale; Lagadec, Catherine; Branellec, Pierre.
The Cambios cruises aimed at studying the variability of the circulation in the Canary basin, specifically: the evolution of the Azores front and the detection of meddies. The dataset includes the vertical profiles collected with the CTD and LADCP equipment.
Tipo: Dataset Palavras-chave: LADCP; CTD; North-East Atlantic; Azores front; Meddies.
Ano: 2015 URL: http://dx.doi.org/10.17882/40905
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CAMBIOS, Vessel mounted ADCP data (RDI NB-75) ArchiMer
Gaillard, Fabienne; Lherminier, Pascale; Remy, Elisabeth; Abel, Karine.
This dataset includes the VMADCP data from the 3 CAMBIOS cruises (processing level: L2b, sofware: Cascade)
Tipo: Dataset Palavras-chave: VMADCP; SADCP; Canary basin; North-East Atlantic; Azores front.
Ano: 2015 URL: http://dx.doi.org/10.17882/40808
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CAMBIOS. Vol 5: Données ADCP de coque RDI NB-75 ArchiMer
Gaillard, Fabienne; Rémy, Elisabeth; Abel, Karine.
Les trois campagnes CAMBIOS effectuées en 1997 et 1998 à bort du NO Thalassa ont permis de collecter des mesures ADCP de coque. Ce rapport décrit le traitement des données fait avec le logiciel CASCADE du LPO (V1, V2, V3).
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00293/40437/39000.pdf
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CAMBIOS - Volume 1: Campagne Cambios 97 - Rapport de données CTD-O2 ArchiMer
Gaillard, Fabienne; Billant, Andre; Branellec, Pierre.
La campagne CAMBIOS-97 a permis de constituer un vaste ensemble de données d'océanographie physique sur la circulation dans le bassin des Canaries. Cette région traversée par le courant des Açores est l'une des plus actives du bassin Nord-Est. Le courant des Açores est une extension du Gulf-Stream. Après le passage de la dorsale médio-Atlantique, il perd progressivement son identité dans le bassin des Canaries où il méandre, se divise en branches et crée des tourbillons. Dans les couches les plus profondes, l'influence de l'eau Méditerranéenne se traduit par une forte anomalie de sel. Des structures anticycloniques (meddies) ayant emprisonné de l'eau Méditerranéenne au niveau de la péninsule ibérique se déplacent vers cette région et la traversent avant de...
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Ano: 1998 URL: http://archimer.ifremer.fr/doc/00210/32140/30597.pdf
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CAMBIOS - Volume 4 : Campagne Cambios 98 - Rapport de données CTD-O2 - Contribution à CANIGO (MAS3-CT96-0060) ArchiMer
Gaillard, Fabienne; Billant, Andre; Branellec, Pierre.
CAMBIOS is the contribution of the Laboratoire de Physique des Océans to the european MAST-III program CANIGO. This report presents the CTD-02 dataset collected during the cruise CAMBIOS 98, in collaboration with the University of Las Palmas de Gran Canaria. While CAMBIOS 97 was focused on the canary basin itselj, this cruise intents to cover a wider area, in order to establish a connection with the measurements performed at the same period by Canigopartners in the Gulf of Cadix and by IFREMERISHOM program ARCANE north of 36°N. During CAMBIOS 98, 68 full depth profiles of temperature, conductivity, pressure and oxygen have been collected. Bottle samples were taken at 30 levels. They have been used for calibration of the salinity and oxygen measurements...
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Ano: 1999 URL: http://archimer.ifremer.fr/doc/00233/34399/32798.pdf
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CASCADE V6.1 : Logiciel de validation et de visualisation des mesures ADCP de coque ArchiMer
Le Bot, Philippe; Kermabon, Catherine; Lherminier, Pascale; Gaillard, Fabienne.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00342/45285/44750.pdf
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Collecting and gridding complementary in-situ SST/SSS data for the calibration and validation of SMOS ArchiMer
Brion, Emilie; Gaillard, Fabienne; Petit De La Villeon, Loic; Delcroix, Thierry; Alory, Gael; Reverdin, Gilles.
Providing reliable in-situ surface temperature and salinity data over the global ocean within short delay is critical for the calibration and validation of the recently launched Soil Moisture and Ocean Salinity Satellite (SMOS). The work presented here has been undertaken as a contribution to GLOSCAL (Global Ocean Surface Salinity Calibration and Validation), retained as one of the ESA CalVal Projects. Based on the Coriolis datasets and using In Situ Analysis System (ISAS) tool, a near real time analysis system has been developed. It provides gridded fields of sea surface salinity and temperature and the corresponding in-situ dataset. In addition to research activities, these products would be used to help the quality control of SMOS satellite data, and to...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00114/22548/20229.pdf
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Consistency of the current global ocean observing systems from an Argo perspective ArchiMer
Von Schuckmann, Karina; Sallee, Jean-baptiste; Chambers, D.; Le Traon, Pierre-yves; Cabanes, Cecile; Gaillard, Fabienne; Speich, Sabrina; Hamon, Mathieu.
Variations in the world's ocean heat storage and its associated volume changes are a key factor to gauge global warming and to assess the earth's energy and sea level budget. Estimating global ocean heat content (GOHC) and global steric sea level (GSSL) with temperature/salinity data from the Argo network reveals a positive change of 0.5 +/- 0.1 W m(-2) (applied to the surface area of the ocean) and 0.5 +/- 0.1 mm year(-1) during the years 2005 to 2012, averaged between 60 degrees S and 60 degrees N and the 10-1500m depth layer. In this study, we present an intercomparison of three global ocean observing systems: the Argo network, satellite gravimetry from GRACE and satellite altimetry. Their consistency is investigated from an Argo perspective at global...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00202/31365/29753.pdf
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Contribution to the ICES Working Group on Ocean Hydrography. National report: France. 2013 ArchiMer
Gaillard, Fabienne; Reverdin, Gilles; Morin, Pascal.
Annual report on the hydrological conditions of the North Atlantic in 2012: 1) General conditions deduced from the analyzed fields ISAS based on ARGO floats data; 2) Ships of opportunity along 60°N; 3) South Western Channel time series.
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00134/24509/22537.pdf
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Contribution to the ICES Working Group on Oceanic Hydrography. National report: France, April 2017 ArchiMer
Kolodziejczyk, Nicolas; Gaillard, Fabienne; Reverdin, Gilles; Cariou, T; Bozec, Y; Morin, Pascal.
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00391/50260/50887.pdf
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Contribution to the ICES Working Group on Oceanic Hydrography. National report: France, June 2016 ArchiMer
Kolodziejczyk, Nicolas; Gaillard, Fabienne; Reverdin, Gilles; Cariou, T; Bozec, Y; Morin, Pascal.
This report is the national French contribution to the ICES Working Group on Ocean Hydrography (WGOH) description of th North Atlantic condition during 2015.
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00342/45273/44736.pdf
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