Modulation of the vertical particle transfer efficiency in the oxygen minimum zone off Peru

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dc.contributor.authorBretagnon, Marine
dc.contributor.authorPaulmier, Aurélien
dc.contributor.authorGarçon, Véronique
dc.contributor.authorDewitte, Boris
dc.contributor.authorIllig, Seréna
dc.contributor.authorLeblond, Nathalie
dc.contributor.authorCoppola, Laurent
dc.contributor.authorCampos, Fernando
dc.contributor.authorVelazco, Federico
dc.contributor.authorPanagiotopoulos, Christos
dc.contributor.authorOschlies, Andreas
dc.contributor.authorHernandez-Ayon, J. Martin
dc.contributor.authorMaske, Helmut
dc.contributor.authorVergara, Oscar
dc.contributor.authorMontes Torres, Ivonne
dc.contributor.authorMartinez, Philippe
dc.contributor.authorCarrasco, Edgardo
dc.contributor.authorGrelet, Jacques
dc.contributor.authorDesprez-De-Gesincourt, Olivier
dc.contributor.authorMaes, Christophe
dc.contributor.authorScouarnec, Lionel
dc.coverage.spatialPerú
dc.date.accessioned2018-11-05T16:41:36Z
dc.date.available2018-11-05T16:41:36Z
dc.date.issued2018
dc.description.abstractThe 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.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationBretagnon, 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-15-5093-2018es_ES
dc.identifier.doihttps://doi.org/10.5194/bg-15-5093-2018es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalBiogeoscienceses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/3291
dc.language.isoenges_ES
dc.publisherEuropean Geosciences Union (EGU)es_ES
dc.relation.ispartofurn:issn:1726-4170
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectMinimum oxygen zonees_ES
dc.subjectParticleses_ES
dc.subjectSedimentationes_ES
dc.subjectOutcorpses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.11es_ES
dc.titleModulation of the vertical particle transfer efficiency in the oxygen minimum zone off Perues_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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