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| Houpert, L.; Durrieu De Madron, X. Durrieu; Testor, P.; Bosse, A.; D'Ortenzio, F.; Bouin, M. N.; Dausse, D.; Le Goff, H.; Kunesch, S.; Labaste, M.; Coppola, L.; Mortier, L.; Raimbault, P.. |
| We present here a unique oceanographic and meteorological dataset focus on the deep convection processes. Our results are essentially based on in situ data (mooring, research vessel, glider, and profiling float) collected from a multi-platform and integrated monitoring system (MOOSE: Mediterranean Ocean Observing System on Environment), which monitored continuously the northwestern Mediterranean Sea since 2007, and in particular high-frequency potential temperature, salinity and current measurements from the mooring LION located within the convection region. From 2009 to 2013, the mixed layer depth reaches the seabed, at a depth of 2330m, in February. Then, the violent vertical mixing of the whole water column lasts between 9 and 12 days setting up the... |
| Tipo: Text |
Palavras-chave: Physical oceanography; Ocean observations; Dense water formation; Open-ocean deep convection; Mixed layer; Gulf of lions; Deep water; Mediterranean Sea. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00355/46588/46400.pdf |
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| Ram, Pradeep A. S.; Mari, X.; Brune, J.; Torreton, J. P.; Chu, V. T.; Raimbault, P.; Niggemann, J.; Sime-ngando, T.. |
| Increasing human activity has raised concerns about the impact of deposition of anthropogenic combustion aerosols (i.e., black carbon; BC) on marine processes. The sea surface microlayer (SML) is a key gate for the introduction of atmospheric BC into the ocean; however, relatively little is known of the effects of BC on bacteria-virus interactions, which can strongly influence microbially mediated processes. To study the impact of BC on bacteria-virus interactions, field investigations involving collection from the SML and underlying water were carried out in Halong Bay (Vietnam). Most inorganic nutrient concentrations, as well as dissolved organic carbon, were modestly but significantly higher (p = 0.02-0.05) in the SML than in underlying water. The... |
| Tipo: Text |
Palavras-chave: Black carbon; Virus-bacteria interaction; Viral lysis; Lysogeny; Sea surface microlayer; Tropical coastal ocean. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00427/53848/75163.pdf |
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| Van Wambeke, F.; Ghiglione, J-f.; Nedoma, J.; Mével, G.; Raimbault, P.. |
| We examined the vertical and temporal dynamics of nutrients, ectoenzymatic activities under late summer-fall transition period (September–October 2004) in NW Mediterranean Sea in relation to temporal change in factors limiting bacterial production. The depth of the mixed layer (12.8±5.3m) was extremely stable until the onset of the destratification period after 11 October, creating a zone where diffusion of nutrient from the much deeper phosphacline (69±12 m) and nitracline (50±8 m) was probably strongly limited. However during the second half of the cruise, a shallowing of nutriclines occured, particularly marked for nitracline. Hence, the nitrate to phosphate ratio within the mixed layer, although submitted to a high short term variability, shifted the... |
| Tipo: Text |
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| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00212/32331/30783.pdf |
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| Oziel, L.; Massicotte, P.; Randelhoff, A.; Ferland, J.; Vladoiu, A.; Lacour, L.; Galindo, V; Lambert-girard, S.; Dumont, D.; Cuypers, Y.; Bouruet-aubertot, P.; Mundy, C-j; Ehn, J.; Becu, G.; Marec, Claudie; Forget, M-h; Garcia, N.; Coupel, P.; Raimbault, P.; Houssais, M-n; Babin, M.. |
| Arctic sea ice is experiencing a shorter growth season and an earlier ice melt onset. The significance of spring microalgal blooms taking place prior to sea ice breakup is the subject of ongoing scientific debate. During the Green Edge project, unique time-series data were collected during two field campaigns held in spring 2015 and 2016, which documented for the first time the concomitant temporal evolution of the sea ice algal and phytoplankton blooms in and beneath the landfast sea ice in western Baffin Bay. Sea ice algal and phytoplankton blooms were negatively correlated and respectively reached 26 (6) and 152 (182) mg of chlorophyll a per m(2) in 2015 (2016). Here, we describe and compare the seasonal evolutions of a wide variety of physical... |
| Tipo: Text |
Palavras-chave: Under-ice bloom; Phytoplankton and sea ice algae; Arctic Ocean; Baffin Bay; Environmental conditions; Light and mixing. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62487/66800.pdf |
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| D'Ortenzio, Fabrizio; Le Reste, Serge; Lavigne, Heloise; Besson, F.; Claustre, H.; Coppola, Laurent; Dufour, A.; Dutreuil, Vincent; Laes, Agathe; Leymarie, Edouard; Malarde, Damien; Mangin, A.; Migon, Christophe; Morin, P.; Poteau, A.; Prieur, L.; Raimbault, P.; Testor, Pierre. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22555/20243.pdf |
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| Fripiat, F.; Elskens, M.; Trull, T. W.; Blain, S.; Cavagna, A. -j.; Fernandez, C.; Fonseca-batista, D.; Planchon, F.; Raimbault, P.; Roukaerts, A.; Dehairs, F.. |
| Nitrification, the microbially mediated oxidation of ammonium into nitrate, is generally expected to be low in the Southern Ocean mixed layer. This paradigm assumes that nitrate is mainly provided through vertical mixing and assimilated during the vegetative season, supporting the concept that nitrate uptake is equivalent to the new primary production (i.e., primary production which is potentially available for export). Here we show that nitrification is significant (~40–80% of the seasonal nitrate uptake) in the naturally iron-fertilized bloom over the southeast Kerguelen Plateau. Hence, a large fraction of the nitrate-based primary production is regenerated, instead of being exported. It appears that nitrate assimilation (light dependent) and... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00296/40704/39700.pdf |
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