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dc.contributor.author Bretagnon, Marine
dc.contributor.author Paulmier, Aurélien
dc.contributor.author Garçon, Véronique
dc.contributor.author Dewitte, Boris
dc.contributor.author Illig, Seréna
dc.contributor.author Leblond, Nathalie
dc.contributor.author Coppola, Laurent
dc.contributor.author Campos, Fernando
dc.contributor.author Velazco, Federico
dc.contributor.author Panagiotopoulos, Christos
dc.contributor.author Oschlies, Andreas
dc.contributor.author Hernandez-Ayon, J. Martin
dc.contributor.author Maske, Helmut
dc.contributor.author Vergara, Oscar
dc.contributor.author Montes Torres, Ivonne
dc.contributor.author Martinez, Philippe
dc.contributor.author Carrasco, Edgardo
dc.contributor.author Grelet, Jacques
dc.contributor.author Desprez-De-Gesincourt, Olivier
dc.contributor.author Maes, Christophe
dc.contributor.author Scouarnec, Lionel
dc.coverage.spatial Perú
dc.date.accessioned 2018-11-05T16:41:36Z
dc.date.available 2018-11-05T16:41:36Z
dc.date.issued 2018
dc.identifier.citation Bretagnon, M., Paulmier, A., Garçon, V., Dewitte, B., Illig, S., Leblond, N., ... Scouarnec, L. (2018). Modulation of the vertical particle transfer efficiency in the oxygen minimum zone off Peru.==$Biogeosciences, 15$==(16), 5093-5111. https://doi.org/10.5194/bg-15-5093-2018 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/3291
dc.description.abstract 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] < 25µmolkg−1) and hypoxic–oxic (15 < [O₂] < 160µmolkg−1) in austral summer and winter–spring, respectively. The OMZ vertical transfer efficiency of particulate organic carbon (POC) between traps (Teff) can be classified into three main ranges (high, intermediate, low). These different Teff ranges suggest that both predominant preservation (high Teff > 50%) and remineralisation (intermediate Teff 20 < 50% or low Teff < 6%) configurations can occur. An efficient OMZ vertical transfer (Teff > 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 < 6%). Transfer efficiency of chemical elements composing the majority of the flux (nitrogen, phosphorus, silica, calcium carbonate) follows the same trend as for carbon, with the lowest transfer level being in late winter and early spring. Regarding particulate isotopes, vertical transfer of δ15N suggests a complex pattern of 15N impoverishment or enrichment according to Teff modulation. This sensitivity of OM to O₂ fluctuations and particle concentration calls for further investigation into OM and O₂-driven remineralisation processes. This should include consideration of the intermittent behaviour of OMZ towards OM demonstrated in past studies and climate projections. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher European Geosciences Union (EGU) es_ES
dc.relation.ispartof urn:issn:1726-4170
dc.rights info:eu-repo/semantics/openAccess es_ES
dc.rights.uri https://creativecommons.org/licences/by/4.0/ es_ES
dc.subject Minimum oxygen zone es_ES
dc.subject Particles es_ES
dc.subject Sedimentation es_ES
dc.subject Outcorps es_ES
dc.title Modulation of the vertical particle transfer efficiency in the oxygen minimum zone off Peru es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.00 es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.09 es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.11 es_ES
dc.identifier.journal Biogeosciences es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.5194/bg-15-5093-2018 es_ES

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