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Título:
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Modulation of the vertical particle transfer efficiency in the oxygen minimum zone off Peru (2018)
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Autores:
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Bretagnon, Marine, Autor ;
Paulmier, Aurélien, Autor ;
Garçon, Véronique, Autor ;
Dewitte, Boris, Autor ;
Illig, Séréna, Autor ;
Leblond, Nathalie, Autor ;
Coppola, Laurent, Autor ;
Campos, Fernando, Autor ;
Velazco Castillo, Federico, Autor ;
Panagiotopoulos, Christos, Autor ;
Oschlies, Andreas, Autor ;
Hernandez-Ayon, J. Martin, Autor ;
Maske, Helmut, Autor ;
Vergara, Oscar, Autor ;
Montes, Ivonne, Autor ;
Martinez, Philippe, Autor ;
Carrasco, Edgardo, Autor ;
Grelet, Jacques, Autor ;
Desprez-De-Gesincourt, Olivier, Autor ;
Maes, Christophe, Autor ;
Scouarnec, Lionel, Autor
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Tipo de documento:
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Article : documento electrónico
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En :
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Biogeosciences (2018 vol. 15 n° 16, Variada)
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Artículo en la página:
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pp. 5093-5111
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Idiomas:
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Inglés
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Clasificación:
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Materia Orgánica
Sedimentos
Sistemas de surgencia del límite oriental (EBUS)
Transferencia vertical
Zona de Mínimo Oxigeno
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Resumen:
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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 O2 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 O2 series characterising two seasonal steady states at the upper trap: suboxic ([O2]50 %) and remineralisation (intermediate Teff 20 50 %) has been reported in summer and winter associated with extreme limitation in O2 concentrations or OM quantity for OM degradation. However, higher levels of O2 or OM, or less refractory OM, at the oxycline, even in a co-limitation context, can decrease the OMZ transfer efficiency to below 50 %. This is especially true in summer during intraseasonal wind-driven oxygenation events. In late winter and early spring, high oxygenation conditions together with high fluxes of sinking particles trigger a shutdown of the OMZ transfer (Teff
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En línea:
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https://repositorio.imarpe.gob.pe/bitstream/20.500.12958/10383/1/Modulation%20of%20the%20vertical%20particle%20transfer%20efficiency.pdf
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