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Registros recuperados: 7
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A whirling ecosystem in the equatorial Atlantic ArchiMer
Menkes, Christophe; Kennan, Sc; Flament, Pierre; Dandonneau, Y; Masson, S; Biessy, B; Marchal, E; Eldin, G; Grelet, J; Montel, Y; Morliere, A; Lebourges-dhaussy, A; Moulin, C; Champalbert, G; Herbland, Alain.
[1] The equatorial Pacific and Atlantic oceans exhibit remarkable meridional undulations in temperature and chlorophyll fronts visible from space over thousands of kilometers and often referred to as tropical instability waves. Here, we present new observations of an ecosystem ranging through three trophic levels: phytoplankton, zooplankton and small pelagic fish whirling within a tropical vortex of the Atlantic ocean and associated with such undulations. Cold, nutrient and biologically rich equatorial waters are advected northward and downward to form sharp fronts visible in all tracers and trophic levels. The equatorward recirculation experiences upwelling at depth, with the pycnocline and ecosystem progressively moving toward the surface to reconnect...
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00000/10049/9584.pdf
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Are sea surface temperature satellite measurements reliable proxies of lagoon temperature in the south pacific? ArchiMer
Van Wynsberge, Simon; Menkes, Christophe; Le Gendre, Romain; Passfield, Teuru; Andrefouet, Serge.
In remote coral reef environments, lagoon and reef in situ measurements of temperature are scarce. Sea Surface Temperature (SST) measured by satellite has been frequently used as a proxy of the lagoon temperature experienced by coral reef organisms (TL) especially during coral bleaching events. However, the link between SST and TL is poorly characterized. First, we compared the correlation between various SST series and TL from 2012 to 2016 in three atolls and one island in the Central South Pacific Ocean. Simple linear correlation between SST and TL ranged between 0.44 and 0.97 depending on lagoons, localities of sensors, and type of SST data. High-resolution-satellite-measurements of SST inside the lagoons did not outperform oceanic SST series,...
Tipo: Text Palavras-chave: Atoll lagoon; Pacific islands; Reef aperture; Climate change; Sea Surface Temperature.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00403/51491/52087.pdf
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From the western boundary currents to the Pacific Equatorial Undercurrent: Modeled pathways and water mass evolutions ArchiMer
Grenier, Melanie; Cravatte, Sophie; Blanke, Bruno; Menkes, Christophe; Koch-larrouy, Ariane; Durand, Fabien; Melet, Angelique; Jeandel, Catherine.
The hydrological and geochemical properties of the waters constituting the Pacific Equatorial Undercurrent (EUC) determine the properties of the equatorial cold tongue. Understanding and quantifying the various EUC origins is therefore of prime importance. For this purpose, a high-resolution (1/4 degrees) interannual oceanic simulation was analyzed from the western tropical Pacific boundaries to 140 degrees W, using a Lagrangian framework. Waters from the Low-Latitude Western Boundary Currents (LLWBCs) transiting from Vitiaz Strait (the main contributor), from Solomon Strait, and via the Mindanao Current were identified as the principal sources to the EUC. Waters conveyed by the interior ocean off equator are negligible till 180 E. The LLWBCs' waters...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00060/17105/14621.pdf
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Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP) ArchiMer
Guieu, Cecile; Bonnet, Sophie; Petrenko, Anne; Menkes, Christophe; Chavagnac, Valerie; Desboeufs, Karine; Maes, Christophe; Moutin, Thierry.
In the Western Tropical South Pacific, patches of high chlorophyll concentrations linked to the occurrence of N2-fixing organisms are found in the vicinity of volcanic islands. The survival of these organisms relies on a high bioavailable iron supply whose origin and fluxes remain unknown. Here, we measured high dissolved iron (DFe) concentrations (up to 66 nM) in the euphotic layer, extending zonally over 10 degrees longitude (174 E−175 W) at ∼20°S latitude. DFe atmospheric fluxes were at the lower end of reported values of the remote ocean and could not explain the high DFe concentrations measured in the water column in the vicinity of Tonga. We argue that the high DFe concentrations may be sustained by a submarine source, also characterized by...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00444/55564/57174.pdf
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Modelling N2 fixation related to Trichodesmium sp.: driving processes and impacts on primary production in the tropical Pacific Ocean ArchiMer
Dutheil, Cyril; Aumont, Olivier; Gorgues, Thomas; Lorrain, Anne; Bonnet, Sophie; Rodier, Martine; Dupouy, Cecile; Shiozaki, Takuhei; Menkes, Christophe.
Dinitrogen fixation is now recognized as one of the major sources of bio-available nitrogen in the ocean. Thus, N2 fixation sustains a significant part of the global primary production by supplying the most common limiting nutrient for phytoplankton growth. The Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) improved the data coverage of the western tropical South Pacific, an area recently recognized as a hotspot of N2 fixation. This new development leads us to develop and test an explicit N2 fixation formulation based on the Trichodesmium physiology (the most studied nitrogen fixer) within a 3-D coupled dynamical–biogeochemical model (ROMS-PISCES). We performed a climatological numerical simulation that is able to reproduce the main physical...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00419/53042/53979.pdf
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Rapport des campagnes MARACAS 7 & 8 ArchiMer
Garrigue, Claire; Bonneville, Claire; Derville, Solène; Allain, Valérie; Aucan, Jérôme; Bourgogne, Hugo; Bachelier, Celine; Dutheil, Cyril; Grelet, Jacques; Laran, Sophie; Menkes, Christophe; Niksic, Sara; Pallin, Logan; Pérard, Véronique; Portal, Annie; Receveur, Aurore; Renaud, Armelle; Roger, Jean; Varillon, David; Vourey, Elodie.
En 2014 le gouvernement de la Nouvelle-Caledonie a cree le parc naturel de la mer de Corail, l'une des plus grandes zones protegees au monde. Afin de renseigner les zones de conservation prioritaires et de faciliter la mise en place de mesures qui puissent efficacement proteger la megafaune marine, il est necessaire d'acquerir des informations sur sa distribution et l'usage des habitats. C'est pourquoi en 2016, l'IRD a lance le programme WHERE1 qui vise a explorer la distribution spatiale et l'habitat des baleines a bosse pour ameliorer leur gestion spatiale dans le parc naturel de la mer de Corail. Les principaux objectifs du programme WHERE consistent a etablir la distribution des baleines a bosse au sein du parc naturel de la mer de Corail, a evaluer la...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00611/72338/71167.pdf
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Spatial and temporal variability of zooplankton off New Caledonia (Southwestern Pacific) from acoustics and net measurements ArchiMer
Smeti, Houssem; Pagano, Marc; Menkes, Christophe; Lebourges-dhaussy, Anne; Hunt, Brian P. V.; Allain, Valerie; Rodier, Martine; De Boissieu, Florian; Kestenare, Elodie; Sammari, Cherif.
Spatial and temporal distribution of zooplankton off New Caledonia in the eastern Coral Sea was studied during two multidisciplinary cruises in 2011, during the cool and the hot seasons. Acoustic measurements of zooplankton were made using a shipborne acoustic Doppler current profiler (S-ADCP), a scientific echosounder and a Tracor acoustic profiling system (TAPS). Relative backscatter from ADCP was converted to biomass estimates using zooplankton weights from net-samples collected during the cruises. Zooplankton biomass was estimated using four methods: weighing, digital imaging (ZooScan), ADCP and TAPS. Significant correlations were found between the different biomass estimators and between the backscatters of the ADCP and the echosounder. There was a...
Tipo: Text Palavras-chave: South Pacific; Acoustics; Zooplankton; Vertical migration; Water masses; Mesoscale dynamics.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00297/40809/39836.pdf
Registros recuperados: 7
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