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| Registros recuperados: 61 | |
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| Bouruet-aubertot, Pascale; Mercier, Herle; Gaillard, Fabienne; Lherminier, Pascale. |
| The purpose of this paper is to characterize inertia-gravity waves (IGW) activity and to investigate the variability of these waves in relationship to atmospheric forcing and larger-scale motions. To this aim, we analyzed Eulerian measurements of horizontal currents and temperature collected over 1 year during the Programme Océan Multidisciplinaire Méso Echelle (POMME). We focused on the main frequency components of the IGW spectrum, namely the inertial frequency f and the semidiurnal frequency M2. Time evolution of the relative energy of these two components gave evidence of isolated events of high intensity. We performed a detailed analysis of these events and identified mechanisms of generation of these waves. Localized spots of intense, near-inertial... |
| Tipo: Text |
Palavras-chave: Turbulent mixing; Tnertia gravity waves. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-359.pdf |
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| Yin, Xiaobin; Boutin, Jacqueline; Martin, Nicolas; Spurgeon, Paul; Vergely, Jean-luc; Gaillard, Fabienne. |
| The wind speed (WS) provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) is used to initialize the retrieval process of WS and Sea Surface Salinity (SSS) obtained by the Soil Moisture and Ocean Salinity (SMOS) mission. This process compensates for the lack of onboard instrument providing a measure of ocean surface WS independent of the L-band radiometer measurements. The SMOS-retrieved WS in the center of the swath (± 300 km) is adjusted regarding to its a priori estimate. The quality of the SMOS-retrieved SSS (SSSSMOS) is better at the center of the swath than at the edge of the swatch because the larger number of brightness temperature measurements available at the center of the swath reduces the effects of noise and because the... |
| Tipo: Text |
Palavras-chave: SMOS; SSMIS; ECMWF; Wind speed; Salinity. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00158/26970/25261.pdf |
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| Gaillard, Fabienne. |
| ISAS (In Situ Analysis System) is an analysis tool for the temperature and salinity fields. Originally designed for the synthesis of ARGO dataset, it has been tested for the first time on the POMME area in the North-East Atlantic in 2000, it was later extended to the Atlantic and the Global ocean as the Argo array was setting up. It is developed and maintained at LPO (Laboratoire de Physique des Océans) within the Argo Observing Service (SO-ARGO) where it is used for research purposes on ocean variability. ISAS is made available to the Coriolis datacenter for exploitation in operational mode. It can accommodate a wide range of in situ measurements if they are provided in the standard NetCdf format distributed by the Coriolis datacenter... |
| Tipo: Text |
Palavras-chave: ISAS. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00115/22583/20271.pdf |
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| 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... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00114/22548/20229.pdf |
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| Sarafanov, Artem; Falina, Anastasia; Mercier, Herle; Sokov, Alexey; Lherminier, Pascale; Gourcuff, Claire; Gladyshev, Sergey; Gaillard, Fabienne; Daniault, Nathalie. |
| A mean state of the full-depth summer circulation in the Atlantic Ocean in the region in between Cape Farewell (Greenland), Scotland and the Greenland-Scotland Ridge (GSR) is assessed by combining 2002–2008 yearly hydrographic measurements at 59.5°N, mean dynamic topography, satellite altimetry data and available estimates of the Atlantic–Nordic Seas exchange. The mean absolute transports by the upper-ocean, mid-depth and deep currents and the Meridional Overturning Circulation (MOCσ = 16.5 ± 2.2 Sv, at σ0 = 27.55) at 59.5°N are quantified in the density space. Inter-basin and diapycnal volume fluxes in between the 59.5°N section and the GSR are then estimated from a box model. The dominant components of the meridional exchange across 59.5°N are the North... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00059/16997/14499.pdf |
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| 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... |
| Tipo: Text |
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| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00233/34397/32793.pdf |
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| 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... |
| Tipo: Text |
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| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00312/42332/41661.pdf |
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| 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... |
| Tipo: Text |
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| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00233/34399/32798.pdf |
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| Hughes, Sarah L.; Holliday, N. Penny; Gaillard, Fabienne. |
| The ICES Report on Ocean Climate presents the latest information on the status and trends of sea temperature and salinity in the North Atlantic and Nordic Seas. It is the main product of the ICES Working Group on Oceanic Hydrography, published annually. Bringing together multiple time-series from across the ICES and NAFO regions offers insight into the concurrent spatial and temporal trends in ocean temperature and salinity. This paper presents an overview of the physical variability in the North Atlantic Ocean at decadal and longer time-scales and reviews the current state of understanding of the causes and mechanisms of this variability. Between the 1960s and the 1990s, the North Atlantic Oscillation (NAO) index increased from a persistent negative phase... |
| Tipo: Text |
Palavras-chave: Circulation; Multidecadal variability; North Atlantic; Salinity; Temperature. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19854/17513.pdf |
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| Balmaseda, M. A.; Hernandez, F.; Storto, A.; Palmer, M. D.; Alves, O.; Shi, L.; Smith, G. C.; Toyoda, T.; Valdivieso, M.; Barnier, B.; Behringer, D.; Boyer, T.; Chang, Y-s.; Chepurin, G. A.; Ferry, N.; Forget, Gael; Fujii, Y.; Good, S.; Guinehut, S.; Haines, K.; Ishikawa, Y.; Keeley, S.; Koehls, A.; Lee, T.; Martin, M. J.; Masina, S.; Masuda, S.; Meyssignac, B.; Mogensen, K.; Parent, L.; Peterson, K. A.; Tang, Y. M.; Yin, Y.; Vernieres, G.; Wang, X.; Waters, J.; Wedd, R.; Wang, O.; Xue, Y.; Chevallier, M.; Lemieux, J-f.; Dupont, F.; Kuragano, T.; Kamachi, M.; Awaji, T.; Caltabiano, A.; Wilmer-becker, K.; Gaillard, Fabienne. |
| Uncertainty in ocean analysis methods and deficiencies in the observing system are major obstacles for the reliable reconstruction of the past ocean climate. The variety of existing ocean reanalyses is exploited in a multi-reanalysis ensemble to improve the ocean state estimation and to gauge uncertainty levels. The ensemble-based analysis of signal-to-noise ratio allows the identification of ocean characteristics for which the estimation is robust (such as tropical mixed-layer-depth, upper ocean heat content), and where large uncertainty exists (deep ocean, Southern Ocean, sea ice thickness, salinity), providing guidance for future enhancement of the observing and data assimilation systems. |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00280/39090/37655.pdf |
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| Gaillard, Fabienne; Mercier, Herle; Kermabon, Catherine. |
| The Programme Ocean Multidisciplinaire Meso Echelle (POMME) was designed to describe and quantify the role of mesoscale processes in the subduction of mode waters in the Northeast Atlantic. Intensive situ measurements were maintained during 1 year (September 2000 - October 2001), over a 8 degrees square area centered on 18 degrees W, 42 degrees N. In order to synthesized the in-situ physical observations, and merge them with satellite altimetry and surface fluxes datasets, a simplified Kalman filter has been designed. Daily fields of temperature, salinity, and stream function were produced on a regular grid over a full seasonal cycle. We propose here the gridded fields (KA_ files) and the in-situ datasets used by the analysis (Data_ files). |
| Tipo: Dataset |
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| Ano: 2015 |
URL: http://dx.doi.org/10.17882/39477 |
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| Reverdin, Gilles; Morisset, S.; Boutin, Jacqueline; Martin, Nicolas; Sena-martins, M.; Gaillard, Fabienne; Blouch, P.; Rolland, J.; Font, J.; Salvador, J.; Fernandez, Pili; Stammer, D.. |
| Salinity measurements from 119 surface drifters in 2007-12 were assessed; 80% [Surface Velocity Program with a barometer with a salinity sensor (SVP-BS)] and 75% [SVP with salinity (SVP-S)] of the salinity data were found to be usable, after editing out some spikes. Sudden salinity jumps are found in drifter salinity records that are not always associated with temperature jumps, in particular in the wet tropics. A method is proposed to decide whether and how to correct those jumps, and the uncertainty in the correction applied. Northeast of South America, in a region influenced by the Amazon plume and fresh coastal water, drifter salinity is very variable, but a comparison with data from the Soil Moisture and Ocean Salinity satellite suggests that this... |
| Tipo: Text |
Palavras-chave: Surface observations; Surface layer; Data quality control; Buoy observations. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00190/30095/28748.pdf |
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| Krieger, Magali; Diverres, Denis; Gaillard, Fabienne; Gouriou, Yves; Grelet, Jacques. |
| La collecte systématique des mesures de température et de salinité de surface par les navires de recherche a été initiée en 1999, lors de la phase pilote du projet Coriolis. Aujourd'hui tous les navires hauturiers sont dotés de systèmes homogènes, qualifiés et suivis, ils transmettent leurs données en temps réel au centre de données Coriolis et des échantillons d'eau de mer sont régulièrement prélevés à bord puis acheminés vers le laboratoire d'analyse. Malgré le soin accordé à l'étalonnage des systèmes de mesure et leur nettoyage régulier, il est fréquent d'observer une dérive dans la mesure de conductivité. Il est donc important, en particulier pour le suivi à long terme et les études climatiques, de contrôler et corriger ces mesures. Ce document décrit... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00115/22584/20272.pdf |
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| Da-allada, Casimir Yelognisse; Gaillard, Fabienne; Kolodziejczyk, Nicolas. |
| The mixed-layer salinity (MLS) budget in the tropical Indian Ocean is estimated from a combination of satellite products and in situ observations over the 2004-2012 period, to investigate the mechanisms controlling the seasonal MLS variability. In contrast with previous studies in the tropical Indian Ocean, our results reveal that the coverage, resolution, and quality of available observations are now sufficient to approach a closed monthly climatology seasonal salt budget. In the South-central Arabian Sea and South-western Tropical Indian Ocean (SCAS and STIO, respectively), where seasonal variability of the MLS is pronounced, the monthly MLS tendency terms are well captured by the diagnostic. In the SCAS region, in agreement with previous results, the... |
| Tipo: Text |
Palavras-chave: Tropical Indian Ocean; Observations; Seasonal cycle; Mixed-layer salinity; Mixed-layer budget. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00270/38129/36311.pdf |
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| Gaillard, Fabienne; Terre, Thierry; Guillot, A. |
| Many oceanographic applications require the positioning of the underwater sensor at measurement times. We consider here the case of subsurface moored tomographic instruments, where the distance between source and receiver must be known within a few meters. For that purpose, a long baseline array is deployed: this system includes a navigator, attached to the mooring element and an array of three transponders set on the ocean bottom. To process the navigation data collected with such system, we have developed a method based on optimal estimation. The triangulation problem is not a basic spherical constraints one and the specificity of deep underwater positioning, related to the variability of the ocean sound speed profile are pointed out. Correcting terms... |
| Tipo: Text |
Palavras-chave: Underwater acoustic positioning; Acoustic transponder survey; Long baseline array. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-6422.pdf |
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| Registros recuperados: 61 | |
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