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| Registros recuperados: 16 | |
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| Pizarro-koch, Matias; Pizarro, Oscar; Dewitte, Boris; Montes, Ivonne; Ramos, Marcel; Paulmier, Aurelien; Garcon, Veronique. |
| We investigate the seasonal variability of the southern tip (30 degrees-38 degrees S) of the eastern South Pacific oxygen minimum zone (OMZ) based on a high horizontal resolution (1/12 degrees) regional coupled physical-biogeochemical model simulation. The simulation is validated by available in situ observations and the OMZ seasonal variability is documented. The model OMZ, bounded by the contour of 45 mu M, occupies a large volume (4.5x10(4) km(3)) during the beginning of austral winter and a minimum (3.5x10(4) km(3)) at the end of spring, just 1 and 2 months after the southward transport of the Peru-Chile Undercurrent (PCUC) is maximum and minimum, respectively. We showed that the PCUC significantly impacts the alongshore advection of dissolved oxygen... |
| Tipo: Text |
Palavras-chave: Oxygen minimum zone; Eddy fluxes; Peru-Chile Undercurrent; Oxygen budget; Eastern South Pacific. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00688/79991/82948.pdf |
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| Montes, Ivonne; Dewitte, Boris; Gutknecht, Elodie; Paulmier, Aurelien; Dadou, Isabelle; Oschlies, Andreas; Garcon, Veronique. |
| The connection between the equatorial mean circulation and the oxygen minimum zone (OMZ) in the Eastern Tropical Pacific is investigated through sensitivity experiments with a high-resolution coupled physical-biogeochemical model. A validation against in situ observations indicates a realistic simulation of the vertical and horizontal oxygen distribution by the model. Two sets of climatological open-boundary conditions for the physical variables, which differ slightly with respect to the intensity and vertical structure of the Equatorial Current System, are shown to lead to contrasting characteristics of the simulated OMZ dynamics. From a Lagrangian perspective, the mean differences near the coast originate to a large extent from the different transport of... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00688/79998/82951.pdf |
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| Gasparin, Florent; Maes, Christophe; Sudre, Joel; Garcon, Veronique; Ganachaud, Alexandre. |
| A water mass analysis of the Coral Sea thermocline waters provides a description of their distribution, pathways and mixture based on recent oceanographic cruises in this region of strong western boundary currents. The Optimum Multiparameter method is used to determine the relative contribution of core water masses based on their measured temperature, salinity and dissolved oxygen. The thermocline waters, carried by the broad South Equatorial Current (SEC), are essentially composed of four core water masses of different origins. Coming from the south, the South Pacic Tropical Water South (SPTWS, σ=25.3 kg.m−3) and the Western South Pa-cic Central Water (WSPCW, σ=26.3 kg.m−3) enter the Coral Sea by the channel between the island of New Caledonia and the... |
| Tipo: Text |
Palavras-chave: Thermocline water masses; Optimal Multiparameter analysis; Southwest Pacific Ocean; Western boundary current. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00220/33147/31619.pdf |
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| Bretagnon, Marine; Paulmier, Aurelien; Garcon, Veronique; Dewitte, Boris; Illig, Serena; Leblond, Nathalie; Coppola, Laurent; Campos, Fernando; Velazco, Federico; Panagiotopoulos, Christos; Oschlies, Andreas; Martin Hernandez-ayon, J.; Maske, Helmut; Vergara, Oscar; Montes, Ivonne; Martinez, Philippe; Carrasco, Edgardo; Grelet, Jacques; Desprez-de-gesincourt, Olivier; Maes, Christophe; Scouarnec, Lionel. |
| The fate of the organic matter (OM) produced by marine life controls the major biogeochemical cycles of the Earth's system. The OM produced through photosynthesis is either preserved, exported towards sediments or degraded through remineralisation in the water column. The productive eastern boundary upwelling systems (EBUSs) associated with oxygen minimum zones (OMZs) would be expected to foster OM preservation due to low O-2 conditions. But their intense and diverse microbial activity should enhance OM degradation. To investigate this contradiction, sediment traps were deployed near the oxycline and in the OMZ core on an instrumented moored line off Peru. Data provided high-temporal-resolution O-2 series characterising two seasonal steady states at the... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00486/59764/62889.pdf |
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| Hernandez-ayon, Jose M.; Paulmier, Aurélien; Garcon, Veronique; Sudre, Joel; Montes, Ivonne; Chapa-balcorta, Cecilia; Durante, Giovanni; Dewitte, Boris; Maes, Christophe; Bretagnon, Marine. |
| The oxygen minimum zone (OMZ) of Peru is recognized as a source of CO2 to the atmosphere due to upwelling that brings water with high concentrations of dissolved inorganic carbon (DIC) to the surface. However, the influence of OMZ dynamics on the carbonate system remains poorly understood given a lack of direct observations. This study examines the influence of a coastal Eastern South Pacific OMZ on carbonate system dynamics based on a multidisciplinary cruise that took place in 2014. During the cruise, onboard DIC and pH measurements were used to estimate pCO2 and to calculate the calcium carbonate saturation state (Ω aragonite and calcite). South of Chimbote (9°S), water stratification decreased and both the oxycline and carbocline moved from 150 m depth... |
| Tipo: Text |
Palavras-chave: OMZ; DIC; PH; Omega aragonite; Upwelling Peruvian system. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00588/70004/67919.pdf |
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| Lacombe, Marielle; Garcon, Veronique; Thouron, Daniele; Le Bris, Nadine; Comtat, Maurice. |
| From the study of molybdenum oxidation in aqueous solutions we developed a semi-autonomous method to detect silicate in aqueous samples. Molybdenum oxidation was used to form molybdate in acidic media. The silicomolybdic complex formed with silicate is detectable by amperometry or cyclic voltammetry. The new electrochemical method is in good agreement with the method conventionally used for environmental water silicate analysis. In the second stage, a completely reagentless method was developed using molybdate and proton produced during molybdenum oxidation. Reproducibility tests show a precision of 2.6% for a concentration of 100 mu mol L-1. This new method will be Very Suitable for the development of new autonomous silicate sensors easy to handle and... |
| Tipo: Text |
Palavras-chave: Cyclic voltammetry; Amperometry; Reagentless; Silicate; Molybdenum. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6114.pdf |
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| Gutknecht, Elodie; Dadou, Isabelle; Charria, Guillaume; Cipollini, Paolo; Garcon, Veronique. |
| The present study focuses on the spatial and temporal variability of interactions between physics and biogeochemistry during the Rossby wave passage in the South Atlantic Ocean. The Rossby wave signature in sea level anomalies (SLA) and surface chlorophyll a concentration anomalies (CHLA) is analyzed using remotely sensed data from 1997 to 2006. Wavelengths between 400 and 1100 km, with westward propagating speeds up to 7.5 cm.s−1, are observed. Using a theoretical model, three processes (meridional advection of surface chlorophyll a concentrations, uplifting of subsurface chlorophyll a maximum, and upwelling of nutrients) are likely to explain the chlorophyll a Rossby wave signature. A statistical assumption allows quantifying the relative importance of... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00026/13723/10832.pdf |
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| Chust, Guillem; Allen, J. Icarus; Bopp, Laurent; Schrum, Corinna; Holt, Jason; Tsiaras, Kostas; Zavatarelli, Marco; Chifflet, Marina; Cannaby, Heather; Dadou, Isabelle; Daewel, Ute; Wakelin, Sarah L.; Machu, Eric; Pushpadas, Dhanya; Butenschon, Momme; Artioli, Yuri; Petihakis, Georges; Smith, Chris; Garcon, Veronique; Goubanova, Katerina; Le Vu, Briac; Fach, Bettina A.; Salihoglu, Baris; Clementi, Emanuela; Irigoien, Xabier. |
| Ocean warming can modify the ecophysiology and distribution of marine organisms, and relationships between species, with nonlinear interactions between ecosystem components potentially resulting in trophic amplification. Trophic amplification (or attenuation) describe the propagation of a hydroclimatic signal up the food web, causing magnification (or depression) of biomass values along one or more trophic pathways. We have employed 3-D coupled physical-biogeochemical models to explore ecosystem responses to climate change with a focus on trophic amplification. The response of phytoplankton and zooplankton to global climate-change projections, carried out with the IPSL Earth System Model by the end of the century, is analysed at global and regional basis,... |
| Tipo: Text |
Palavras-chave: Ecosystem model; Food web; Plankton; Primary production; Sea warming; Trophic amplification. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29966/28481.pdf |
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| Garcon, Veronique; Bell, Thomas G; Wallace, Douglas; Arnold, Steve R.; Baker, Alex R.; Bakker, Dorothee C. E.; Bange, Hermann W.; Bates, Nicholas R.; Bopp, Laurent; Boutin, Jacqueline; Boyd, Phili^w.; Bracher, Astrid; Burrows, John P.; Carpenter, Lucy J; De Leeuw, Gerrit; Fennel, Katja; Font, Jordi; Friedrich, Tobias; Garbe, Christoph S.; Gruber, Nicolas; Jaegle, Lyatt; Lana, Arancha; Lee, James D.; Liss, Peter S.; Miller, Lisa A.; Olgun, Nazli; Olsen, Are; Pfeil, Benjamin; Quack, Birgit; Read, Katie A.; Reul, Nicolas; Rodenbeck, Christian; Rohekar, Oliver; Saiz-lopez, Alfonso; Saltzman, Eric S.; Schneising, Oliver; Schuster, Ute; Seferian, Roland; Seinhoff, Tobias; Le Traon, Pierre-yves; Ziska, Franziska. |
| Why a chapter on Perspectives and Integration in SOLAS Science in this book? SOLAS science by its nature deals with interactions that occur: across a wide spectrum of time and space scales, involve gases and particles, between the ocean and the atmosphere, across many disciplines including chemistry, biology, optics, physics, mathematics, computing, socio-economics and consequently interactions between many different scientists and across scientific generations. This chapter provides a guide through the remarkable diversity of cross-cutting approaches and tools in the gigantic puzzle of the SOLAS realm. Here we overview the existing prime components of atmospheric and oceanic observing systems, with the acquisition of ocean–atmosphere observables either... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00171/28189/26428.pdf |
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| Garcon, Veronique; Karstensen, Johannes; Palacz, Artur; Telszewski, Maciej; Aparco Lara, Tony; Breitburg, Denise; Chavez, Francisco; Coelho, Paulo; Cornejo-d'Ottone, Marcela; Santos, Carmen; Fiedler, Bjoern; Gallo, Natalya D.; Gregoire, Marilaure; Gutierrez, Dimitri; Hernandez-ayon, Martin; Isensee, Kirsten; Koslow, Tony; Levin, Lisa; Marsac, Francis; Maske, Helmut; Mbaye, Baye C.; Montes, Ivonne; Naqvi, Wajih; Pearlman, Jay; Pinto, Edwin; Pitcher, Grant; Pizarro, Oscar; Rose, Kenneth; Shenoy, Damodar; Van Der Plas, Anja; Vito, Melo R.; Weng, Kevin. |
| Multidisciplinary ocean observing activities provide critical ocean information to satisfy ever-changing socioeconomic needs and require coordinated implementation. The upper oxycline (transition between high and low oxygen waters) is fundamentally important for the ecosystem structure and can be a useful proxy for multiple observing objectives connected to eastern boundary systems (EBSs) that neighbor oxygen minimum zones (OMZs). The variability of the oxycline and its impact on the ecosystem (VOICE) initiative demonstrates how societal benefits drive the need for integration and optimization of biological, biogeochemical, and physical components of regional ocean observing related to EBS. In liaison with the Global Ocean Oxygen Network, VOICE creates a... |
| Tipo: Text |
Palavras-chave: Oxygen minimum zones; Oxycline; Ocean observing system; Multidisciplinary; Readiness level; Ecosystem. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00659/77112/78546.pdf |
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| Maes, Christophe; Sudre, Loupe Joeel; Garcon, Veronique. |
| The analysis of satellite-based ocean color data shows that low concentrations of surface chlorophyll-a (chl-a) found in the equatorial region of the Pacific Ocean varies in phase with the eastern edge of the warm pool. As is true for high sea surface temperatures, the existence and maintenance of these low concentrations are linked to the upper ocean stratification due to salinity. The present study also establishes the quasi permanence of a frontal zone in chlorophyll-a separating the regimes of the western region and the eastern-central cold tongue and, through the identification of this front in satellite-based ocean color data, it provides, for the first time, a reliable method for locating the eastern edge of the warm pool from surface observations... |
| Tipo: Text |
Palavras-chave: El nino; Enso. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00208/31884/30309.pdf |
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| Breviere, Emilie H. G.; Bakker, Dorothee C. E.; Bange, Hermann W.; Bates, Timothy S.; Bell, Thomas G.; Boyd, Philip W.; Duce, Robert A.; Garcon, Veronique; Johnson, Martin T.; Law, Cliff S.; Marandino, Christa A.; Olsen, Are; Quack, Birgit; Quinn, Patricia K.; Sabine, Christopher L.; Saltzman, Eric S.. |
| The domain of the surface ocean and lower atmosphere is a complex, highly dynamic component of the Earth system. Better understanding of the physics and biogeochemistry of the air-sea interface and the processes that control the exchange of mass and energy across that boundary define the scope of the Surface Ocean-Lower Atmosphere Study (SOLAS) project. The scientific questions driving SOLAS research, as laid out in the SOLAS Science Plan and Implementation Strategy for the period 2004-2014, are highly challenging, inherently multidisciplinary and broad. During that decade, SOLAS has significantly advanced our knowledge. Discoveries related to the physics of exchange, global trace gas budgets and atmospheric chemistry, the CLAW hypothesis (named after its... |
| Tipo: Text |
Palavras-chave: Ocean; Atmosphere; Processes; Biogeochemistry; Flux; Climate. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00293/40405/38964.pdf |
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| Maes, Christophe; Dewitte, Boris; Sudre, Joel; Garcon, Veronique; Varillon, David. |
| The small-scale features in sea surface temperature and salinity fields (SST and SSS) of the Coral Sea are examined using high horizontal spatial and short-term temporal in situ measurements. These features are extracted from thermosalinographs (TSGs) gathered onboard commercial and research vessels and at one long-term fixed station. The analyses are performed along the vessel tracks and the structures of small-scale features are extracted by high-pass spatial filtering the original TSG data. For SSS, it is shown that the features at the scale of mesoscale eddies (approximate to 100 km) vary from about -1.1 to +0.6 psu in the Coral Sea region. Processes sustaining such range include rainfall events, stirring by mesoscale eddies, and the latitudinal... |
| Tipo: Text |
Palavras-chave: In situ observations; SST; SSS; Coral Sea. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00218/32960/31618.pdf |
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| Registros recuperados: 16 | |
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