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| Reverdin, Gilles; Morisset, Simon; Marie, Louis; Bourras, Denis; Sutherland, Graigory; Ward, Brian; Salvador, Joaquin; Font, Jordi; Cuypers, Yannis; Centurioni, Luca; Hormann, Verena; Koldziejczyk, Nicolas; Boutin, Jacqueline; D'Ovidio, Francesco; Nencioli, Francesco; Martin, Nicolas; Diverres, Denis; Alory, Gael; Lumpkin, Rick. |
| We investigated a 100 x 100 km high-salinity region of the North Atlantic subtropical gyre during the Sub-Tropical Atlantic Surface Salinity Experiment/Salinity Processes in the Upper-ocean Regional Study (STRASSE/SPURS) cruise from August 21, 2012, to September 9, 2012. Results showed great variability in sea surface salinity (SSS; over 0.3 psu) in the mesoscale, over 7 cm of total evaporation, and little diapycnal mixing below 36 m depth, the deepest mixed layers encountered. Strong currents in the southwestern part of the domain, and the penetration of freshwater, suggest that advection contributed greatly to salinity evolution. However, it was further observed that a smaller cyclonic structure tucked between the high SSS band and the strongest currents... |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00270/38148/36277.pdf |
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| Lefevre, Nathalie; Urbano, Domingos F.; Gallois, Francis; Diverres, Denis. |
| The fugacity of CO2 (fCO(2)) has been measured underway during three quasi-synoptic cruises in the western tropical Atlantic in March/April 2009 and July/August 2010 in the region 6 degrees S-15 degrees N, 52 degrees W-24 degrees W. The distribution of fCO(2) is related to the main features of the ocean circulation. Temperature exerts a dominant control on the distribution of fCO(2) in March/April whereas salinity plays an important role in July/ August due to the more developed North Equatorial Countercurrent (NECC) carrying Amazon water and to the high precipitation associated with the presence of the Intertropical Convergence Zone (ITCZ). The main surface currents are characterized by different fCO(2). Overall, the NECC carries less saline waters with... |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00624/73571/72947.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... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00115/22584/20272.pdf |
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| Gaillard, Fabienne; Diverres, Denis; Jacquin, Stephane; Gouriou, Yves; Grelet, Jacques; Le Menn, Marc; Tassel, Joelle; Reverdin, Gilles. |
| French Research vessels have been collecting thermo-salinometer (TSG) data since 1999 to contribute to the Global Ocean Surface Underway Data (GOSUD) programme. The instruments are regularly calibrated and continuously monitored. Water samples are taken on a daily basis by the crew and later analysed in the laboratory. We present here the delayed mode processing of the 2001–2013 dataset and an overview of the resulting quality. Salinity measurement error was a few hundredths of a unit or less on the practical salinity scale (PSS), due to careful calibration and instrument maintenance, complemented with a rigorous adjustment on water samples. In a global comparison, these data show excellent agreement with an ARGO-based salinity gridded product. The Sea... |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00283/39473/37954.pdf |
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| Kitidis, Vassilis; Shutler, Jamie D.; Ashton, Ian; Warren, Mark; Brown, Ian; Findlay, Helen; Hartman, Sue E.; Sanders, Richard; Humphreys, Matthew; Kivimae, Caroline; Greenwood, Naomi; Hull, Tom; Pearce, David; Mcgrath, Triona; Stewart, Brian M.; Walsham, Pamela; Mcgovern, Evin; Bozec, Yann; Gac, Jean-philippe; Van Heuven, Steven M. A. C.; Hoppema, Mario; Schuster, Ute; Johannessen, Truls; Omar, Abdirahman; Lauvset, Siv K.; Skjelvan, Ingunn; Olsen, Are; Steinhoff, Tobias; Koertzinger, Arne; Becker, Meike; Lefevre, Nathalie; Diverres, Denis; Gkritzalis, Thanos; Cattrijsse, Andre; Petersen, Wilhelm; Voynova, Yoana G.; Chapron, Bertrand; Grouazel, Antoine; Land, Peter E.; Sharples, Jonathan; Nightingale, Philip D.. |
| Shelf seas play an important role in the global carbon cycle, absorbing atmospheric carbon dioxide (CO2) and exporting carbon (C) to the open ocean and sediments. The magnitude of these processes is poorly constrained, because observations are typically interpolated over multiple years. Here, we used 298500 observations of CO2 fugacity (fCO(2)) from a single year (2015), to estimate the net influx of atmospheric CO2 as 26.2 +/- 4.7 Tg C yr(-1) over the open NW European shelf. CO2 influx from the atmosphere was dominated by influx during winter as a consequence of high winds, despite a smaller, thermally-driven, air-sea fCO(2) gradient compared to the larger, biologically-driven summer gradient. In order to understand this climate regulation service, we... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00607/71869/70566.pdf |
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