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Registros recuperados: 49
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A Long-Lasting Mode Water Vortex in the Northeast Atlantic Ocean ArchiMer
Reverdin, Gilles; Gascard, Jean-claude; Le Cann, Bernard; Prieur, Loic; Assenbaum, Michel; Lherminier, Pascale.
An anticyclonic mode water vortex and its environment were investigated from November 2000 to September 2001 in the northeast Atlantic (near 43.5 degrees N, 15 degrees-19 degrees W) with neutrally buoyant drifting floats, moored current meters, satellite altimetric sea surface height, and several hydrological surveys and sections. These observations reveal a coherent inner core (similar to 0 km in diameter) made of very oxygenated northeast Atlantic central waters (11 degrees-12.7 degrees C and 35.5-35.7 on the 1978 practical salinity scale) from 150 m down to about 750-m depth. The core presents high relative vorticity (up to approximately -0.5 times the Coriolis frequency f) within at least 10 km of its center, near 400-700 m. Peak velocity along the...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6357.pdf
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Altimetry combined with hydrography for ocean transport estimation ArchiMer
Gourcuff, Claire; Lherminier, Pascale; Mercier, Herle; Le Traon, Pierre-yves.
A method to estimate mass and heat transports across hydrographic sections using hydrography together with altimetry data in a geostrophic box inverse model is presented. Absolute surface velocities computed from AVISO altimetry products made up of a combination of sea surface height measurements and geoid estimate are first compared to Ship Acoustic Doppler Current Profiler (S-ADCP) measurements of the Ovide project along hydrographic sections repeated every 2 years in summer from Portugal to Greenland. The rms difference between S-ADCP and altimetry velocities averaged on distances of about a hundred km accounts to 3.3 cm s−1. Considering that the uncertainty of S-ADCP velocities is found at 1.5 cm s−1, altimetry errors are estimated at 3 cm s−1....
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00038/14921/13751.pdf
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Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal ArchiMer
Barraqueta, Jan-lukas Menzel; Schlosser, Christian; Planquette, Helene; Gourain, Arthur; Cheize, Marie; Boutorh, Julia; Shelley, Rachel; Pereira, Leonardo Contreira; Gledhill, Martha; Hopwood, Mark J.; Lacan, Francois; Lherminier, Pascale; Sarthou, Geraldine; Achterberg, Eric P..
The distribution of dissolved aluminium (dAl) in the water column of the North Atlantic and Labrador Sea was studied along GEOTRACES section GA01 to unravel the sources and sinks of this element. Surface water dAl concentrations were low (median of 2.5 nM) due to low aerosol deposition and removal by phytoplankton. However, surface water dAl concentrations were enhanced on the Iberian and Greenland shelves (up to 30.9 nM) due to continental inputs (rivers, glacial flour and ice melt). A negative correlation was observed between dAl in surface waters and primary production, phytoplankton community structure and biogenic opal production. The abundance of diatoms exerted a significant (p < 0.01) control on the surface particulate Al (pAl) to dAl ratios by...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00422/53359/54197.pdf
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Assessing decadal changes in the Deep Western Boundary Current absolute transport southeast of Cape Farewell, Greenland, from hydrography and altimetry ArchiMer
Sarafanov, Artem; Falina, Anastasia; Lherminier, Pascale; Mercier, Herle; Sokov, Alexey; Gourcuff, Claire.
[1] In earlier studies, the decadal variability of the Deep Western Boundary Current (DWBC) transport in the vicinity of Cape Farewell, Greenland, has been assessed from changes in the baroclinic velocities computed from hydrographic data and referenced to 1000 m depth. The main limitation of using such an estimate as an index for the DWBC absolute transport variability comes from the unaccounted for decadal velocity changes at the reference level (1000 m). These changes may substantially contribute to the DWBC absolute transport variability by compensating for or adding to the baroclinic transport changes. To assess this contribution to variability, we quantify the decadal velocity changes which occurred at 1000 m depth southeast of Cape Farewell since...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12855/9820.pdf
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Atlantic Ocean CO2 uptake reduced by weakening of the meridional overturning circulation ArchiMer
Perez, Fiz F.; Mercier, Herle; Vazquez-rodriguez, Marcos; Lherminier, Pascale; Velo, Anton; Pardo, Paula C.; Roson, Gabriel; Rios, Aida F..
Uptake of atmospheric carbon dioxide in the subpolar North Atlantic Ocean declined rapidly between 1990 and 2006. This reduction in carbon dioxide uptake was related to warming at the sea surface, which-according to model simulations-coincided with a reduction in the Atlantic meridional overturning circulation. The extent to which the slowdown of this circulation system-which transports warm surface waters to the northern high latitudes, and cool deep waters south-contributed to the reduction in carbon uptake has remained uncertain. Here, we use data on the oceanic transport of volume, heat and carbon dioxide to track carbon dioxide uptake in the subtropical and subpolar regions of the North Atlantic Ocean over the past two decades. We separate...
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Ano: 2013 URL: https://archimer.ifremer.fr/doc/00135/24625/22712.pdf
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BOCATS 2016. CTD-O2 data report ArchiMer
Branellec, Pierre; Lherminier, Pascale.
The BOCATS cruise (Biennial Observation of Carbon, Acidification, Transport and Sedimentation) was carried out in the North Atlantic from Vigo (June 18) to Reykjavik (July 31). It was composed of 2 main sections: the OVIDE section coast to coast between Portugal and the south tip of Greenland, followed by the Reykjanes Ridge section, from 55 °N to Iceland. The classical hydrographic rosette was cast 137 times along the route. While the CTD-O2 probe acquired continuous profiles of the “physical” variables (pressure, temperature, salinity and dissolved oxygen), 28 Niskin bottles were closed at different levels during the upcast to provide samples for biogeochemical analysis. We report here an overview of the cruise operations and team, followed by a focus on...
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00480/59190/61877.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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Campagne OVIDE 2006 : Rapport de données CTD-O2 ArchiMer
Branellec, Pierre; Lherminier, Pascale.
Le projet Ovide, sous la direction d'Herlé Mercier, a pour objectif d'établir un observatoire de la variabilité de la circulation dans l'océan Atlantique Nord. Le projet s'articule principalement autour de la répétition tous les deux ans d'une section hydrologique de Cap Hoppe au sud-est du Groenland à Cap Mendocino au Portugal, répertoriée sous le nom de A25 dans le programme international CLIVAR (Climate Variability). Elle traverse la Mer d'Irminger, la dorsale de Reykjanes, le Bassin d'Islande, le Bassin Ouest Européen (au sud du plateau de Rockall) et la Plaine Abyssale Ibérique, perpendiculairement aux courants principaux. La répétition de campagnes le long de ce trajet tous les deux ans pendant une période de dix ans permet de documenter l'évolution...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00210/32103/30560.pdf
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Campagne OVIDE 2008 : Rapport de données CTD-O2 ArchiMer
Branellec, Pierre; Ferron, Bruno; Lherminier, Pascale.
La campagne Ovide 4, réalisée du 9 juin au 10 juillet 2008 sur le N/O Thalassa, est la quatrième d'une série de 5 campagnes océanographiques dont le but est d'établir un observatoire de la variabilité climatique du tourbillon subpolaire de l'océan Atlantique Nord. Le projet Ovide est dirigé par Herlé Mercier et il est principalement financé par Ifremer, INSU (LEFE-IDAO) et UBO. Les trois premières campagnes Ovide ont été réalisées à la même période de l'année en 2002, 2004, 2006 et le long du même trajet entre l'extrémité sud-est du Groenland et la Péninsule Ibérique (section Ovide, également appelée A25 dans le programme CLIVAR) via la Mer d'Irminger, le Bassin d'Islande et le Bassin Ouest Européen, légèrement au nord de la section FourEx d'août 1997...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00210/32124/30568.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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CATARINA 2012-Leg 1 - CTD-O2 Data report ArchiMer
Branellec, Pierre; Lherminier, Pascale; Desprez De Gesincourt, Floriane.
The CATARINA Leg1 cruise was carried out from June 22 to July 24 2012 on board the B/O Sarmiento de Gamboa, under the scientific supervision of Aida Rios (CSIC-IIM). It included the occurrence of the OVIDE hydrological section that was performed in June 2002, 2004, 2006, 2008 and 2010, as part of the CLIVAR program (name A25) ), and under the supervision of Herlé Mercier (CNRSLPO). This section begins near Lisbon (Portugal), runs through the West European Basin and the Iceland Basin, crosses the Reykjanes Ridge (300 miles north of Charlie-Gibbs Fracture Zone, and ends at Cape Hoppe (southeast tip of Greenland). The objective of this repeated hydrological section is to monitor the variability of water mass properties and main current transports in the...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00353/46406/46280.pdf
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Cessation and partial reversal of deep water freshening in the northern North Atlantic: observation-based estimates and attribution ArchiMer
Sarafanov, Artem; Mercier, Herle; Falina, Anastasia; Sokov, Alexey; Lherminier, Pascale.
Recent decadal salinity changes in the Greenland-Scotland overflow-derived deep waters are quantified using CTD data from repeated hydrographic sections in the Irminger Sea. The Denmark Strait Overflow Water salinity record shows the absence of any net change over the 1980s-2000s; changes in the Iceland-Scotland Overflow Water (ISOW) and in the deep water column (Sigma(0) > 27.82), enclosing both overflows, show a distinct freshening reversal in the early 2000s. The observed freshening reversal is a lagged consequence of the persistent ISOW salinification that occurred upstream, in the Iceland Basin, after 1996 in response to salinification of the northeast Atlantic waters entrained into the overflow. The entrainment salinity increase is explained by...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7325.pdf
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Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope ArchiMer
Benetti, M.; Reverdin, G.; Lique, Camille; Yashayaev, I.; Holliday, N. P.; Tynan, E.; Torres-valdes, S.; Lherminier, Pascale; Treguer, P.; Sarthou, G..
The Labrador Current is an important conduit of freshwater from the Arctic to the interior North Atlantic subpolar gyre. Here, we investigate the spatial variability of the freshwater sources over the southern Labrador shelf and slope during May-June 2014. Using measurements of seawater properties such as temperature, salinity, nutrients and oxygen isotopic composition, we estimate the respective contributions of saline water of Atlantic and Pacific origins, of brines released during sea ice formation, and of freshwater from sea ice melt and meteoric water origins. On the southern Labrador shelf, we find a large brine signal and Pacific Water influence indicating a large contribution of water from the Canadian Arctic. The brine signal implies that more...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00365/47667/47778.pdf
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Computing inventories of anthropogenic CO2 in the eastern subpolar North Atlantic using OVIDE data ArchiMer
Zunino Rodriguez, Patricia; Perez, Fiz F.; Lherminier, Pascale; Mercier, Herle.
The highest anthropogenic CO2 (Cant) inventories of all the oceans are found in the subpolar North Atlantic (SPNA). The OVIDE section crosses the SPNA from Greenland to Portugal and is repeated biennially since 2002. Therefore, OVIDE data allow evaluating the evolution of inventories of anthropogenic CO2 (Cant) in the SPNA. This oceanic region is known to host water formation and ventilation processes that change the water mass volumetric census year by year. Changes in the volumetric census cause differences in the Cant inventory estimates (Pérez et al., 2008). Consequently, Pérez et al. (2010) proposed a method for computing Cant inventory in the SPNA taking into account the volumetric census variability and a bathymetric adjustment. This method has been...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38170/36314.pdf
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CROSSROAD. Climatic ROle of Subpolar Slopes: a Regional Observational Array off NewfoundlanD ArchiMer
Desbruyeres, Damien; Mercier, Herle; Thierry, Virginie; Lherminier, Pascale; Gula, Jonathan; Cyr, F; Kieke, D; Holliday, P; Smeed, D.
An observational experimental setup will be proposed to investigate the dynamics and thermodynamics of the deep western boundary current in the “transition zone” of the North Atlantic, around Flemish Cap, Newfoundland. Located between the international RAPID and OSNAP mooring arrays, this region represents a unique choke point for most of the North Atlantic large-scale currents and water masses involved in the Atlantic Meridional Overturning Circulation (AMOC). Horizontal export and latitudinal coherence, water mass transformation and vertical motions, as well as shelf-slope-interior exchanges will be studied with repeat hydrography, moorings, drifting and profiling floats, and gliders. Multidisciplinary approaches are likely, including biogeochemistry and...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00503/61502/65316.pdf
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Diagnosing Surface Mixed Layer Dynamics from High-Resolution Satellite Observations: Numerical Insights ArchiMer
Ponte, Aurelien; Klein, Patrice; Capet, Xavier; Le Traon, Pierre-yves; Chapron, Bertrand; Lherminier, Pascale.
High-resolution numerical experiments of ocean mesoscale eddy turbulence show that the wind-driven mixed layer (ML) dynamics affects mesoscale motions in the surface layers at scales lower than O(60 km). At these scales, surface horizontal currents are still coherent to, but weaker than, those derived from sea surface height using geostrophy. Vertical motions, on the other hand, are stronger than those diagnosed using the adiabatic quasigeotrophic (QG) framework. An analytical model, based on a scaling analysis and on simple dynamical arguments, provides a physical understanding and leads to a parameterization of these features in terms of vertical mixing. These results are valid when the wind-driven velocity scale is much smaller than that associated with...
Tipo: Text Palavras-chave: Mesoscale processes; Ocean dynamics; Turbulence.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00170/28076/26291.pdf
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Dissipation Rate Estimates from Microstructure and Finescale Internal Wave Observations along the A25 Greenland–Portugal OVIDE Line ArchiMer
Ferron, Bruno; Kokoszka, Florian; Mercier, Herle; Lherminier, Pascale.
A total of 96 finestructure and 30 microstructure full-depth vertical profiles were collected along the A25 Greenland–Portugal Observatoire de la Variabilité Interannuelle et Décennale en Atlantique Nord (OVIDE) hydrographic line in 2008. The microstructure of the horizontal velocity was used to calculate turbulent kinetic energy dissipation rates εvmp, where vmp refers to the vertical microstructure profiler. The lowest dissipation values (εvmp < 0.5 × 10−10 W kg−1) are found below 2000 m in the Iberian Abyssal Plain and in the center of the Irminger basin; the largest values (>5 × 10−10 W kg−1) are found in the main thermocline, around the Reykjanes Ridge, and in a 1000-m-thick layer above the bottom near 48°N. The finestructure of density was used...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00240/35130/33628.pdf
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Dissolved inorganic carbon budgets in the eastern subpolar North Atlantic in the 2000s from in situ data ArchiMer
Zunino, Patricia; Lherminier, Pascale; Mercier, Herle; Padin, Xose A.; Rios, Aida F.; Perez, Fiz F..
The subpolar North Atlantic (SPNA) is important in the global carbon cycle because of the deep water ventilation processes that lead to both high uptake of atmospheric CO2 and large inventories of anthropogenic CO2 (C-ant). Thus, it is crucial to understand its response to increasing anthropogenic pressures. In this work, the budgets of dissolved inorganic carbon (DIC), C-ant and natural DIC (DICnat) in the eastern SPNA in the 2000s, are jointly analyzed using in situ data. The DICnat budget is found to be in steady state, confirming a long-standing hypothesis from in situ data for the first time. The biological activity is driving the uptake of natural CO2 from the atmosphere. The C-ant increase in the ocean is solely responsible of the DIC storage rate...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00313/42419/41756.pdf
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Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01) ArchiMer
Tonnard, Manon; Planquette, Hélène; Bowie, Andrew R.; Van Der Merwe, Pier; Gallinari, Morgane; Desprez De Gésincourt, Floriane; Germain, Yoan; Gourain, Arthur; Benetti, Marion; Reverdin, Gilles; Tréguer, Paul; Boutorh, Julia; Cheize, Marie; Menzel Barraqueta, Jan-lukas; Pereira-contreira, Leonardo; Shelley, Rachel; Lherminier, Pascale; Sarthou, Géraldine.
Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analysed using a SeaFAST-picoTM coupled to an Element XR HR-ICP-MS and provided interesting insights on the Fe sources in this area. Overall, DFe concentrations ranged from 0.09 ± 0.01 nmol L−1 to 7.8 ± 0.5 nmol L−1. Elevated DFe concentrations were observed above the Iberian, Greenland and Newfoundland Margins likely due to riverine inputs from the Tagus River, meteoric water inputs and sedimentary inputs. Air-sea interactions were suspected to be responsible for the increase in DFe concentrations within subsurface waters of the Irminger Sea due to deep convection occurring the previous winter, that provided iron-to-nitrate ratios sufficient...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00441/55233/56714.pdf
Registros recuperados: 49
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