Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/111411
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dc.contributor.authorSchulz, Kai G.en_US
dc.contributor.authorAchterberg, Eric P.en_US
dc.contributor.authorArístegui, Javieren_US
dc.contributor.authorBach, Lennart T.en_US
dc.contributor.authorBaños, Isabelen_US
dc.contributor.authorBoxhammer, Timen_US
dc.contributor.authorErler, Dirken_US
dc.contributor.authorIgarza, Maricarmenen_US
dc.contributor.authorKalter, Verenaen_US
dc.contributor.authorLudwig, Andreaen_US
dc.contributor.authorLöscher, Carolinen_US
dc.contributor.authorMeyer, Janaen_US
dc.contributor.authorMeyer, Judithen_US
dc.contributor.authorMinutolo, Fabrizioen_US
dc.contributor.authorVon Der Esch, Elisabethen_US
dc.contributor.authorWard, Bess B.en_US
dc.contributor.authorRiebesell, Ulfen_US
dc.date.accessioned2021-08-08T19:39:23Z-
dc.date.available2021-08-08T19:39:23Z-
dc.date.issued2021en_US
dc.identifier.issn1726-4170en_US
dc.identifier.otherScopus-
dc.identifier.urihttp://hdl.handle.net/10553/111411-
dc.description.abstractUpwelling of nutrient-rich deep waters make eastern boundary upwelling systems (EBUSs), such as the Humboldt Current system, hot spots of marine productivity. Associated settling of organic matter to depth and consecutive aerobic decomposition results in large subsurface water volumes being oxygen depleted. Under these circumstances, organic matter remineralisation can continue via denitrification, which represents a major loss pathway for bioavailable nitrogen. Additionally, anaerobic ammonium oxidation can remove significant amounts of nitrogen in these areas. Here we assess the interplay of suboxic water upwelling and nitrogen cycling in a manipulative offshore mesocosm experiment. Measured denitrification rates in incubations with water from the oxygen-depleted bottom layer of the mesocosms (via 15N label incubations) mostly ranged between 5.5 and 20gnmolgN2gL-1gh-1 (interquartile range), reaching up to 80gnmolgN2gL-1gh-1. However, actual in situ rates in the mesocosms, estimated via Michaelis-Menten kinetic scaling, did most likely not exceed 0.2-4.2gnmolgN2gL-1gh-1 (interquartile range) due to substrate limitation. In the surrounding Pacific, measured denitrification rates were similar, although indications of substrate limitation were detected only once. In contrast, anammox (anaerobic ammonium oxidation) made only a minor contribution to the overall nitrogen loss when encountered in both the mesocosms and the Pacific Ocean. This was potentially related to organic matter Cg/gN stoichiometry and/or process-specific oxygen and hydrogen sulfide sensitivities. Over the first 38gd of the experiment, total nitrogen loss calculated from in situ rates of denitrification and anammox was comparable to estimates from a full nitrogen budget in the mesocosms and ranged between g1/4g1 and 5.5gmolgNgL-1. This represents up to g1/4g20g% of the initially bioavailable inorganic and organic nitrogen standing stocks. Interestingly, this loss is comparable to the total amount of particulate organic nitrogen that was exported into the sediment traps at the bottom of the mesocosms at about 20gm depth. Altogether, this suggests that a significant portion, if not the majority of nitrogen that could be exported to depth, is already lost, i.e. converted to N2 in a relatively shallow layer of the surface ocean, provided that there are oxygen-deficient conditions like those during coastal upwelling in our study. Published data for primary productivity and nitrogen loss in all EBUSs reinforce such conclusion.en_US
dc.languageengen_US
dc.relation.ispartofBiogeosciencesen_US
dc.sourceBiogeosciences [ISSN 1726-4170], v. 18 (14), p. 4305-4320, (Julio 2021)en_US
dc.subject251001 Oceanografía biológicaen_US
dc.titleNitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification - A mesocosm approachen_US
dc.typeinfo:eu-repo/semantics/Articleen_US
dc.typeArticleen_US
dc.identifier.doi10.5194/bg-18-4305-2021en_US
dc.identifier.scopus85111136975-
dc.contributor.orcidNO DATA-
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dc.contributor.authorscopusid55458070800-
dc.contributor.authorscopusid7003373116-
dc.contributor.authorscopusid7006816204-
dc.contributor.authorscopusid55050031600-
dc.contributor.authorscopusid57190220268-
dc.contributor.authorscopusid37036780400-
dc.contributor.authorscopusid6507170341-
dc.contributor.authorscopusid57208641638-
dc.contributor.authorscopusid57219451073-
dc.contributor.authorscopusid55554656400-
dc.contributor.authorscopusid55515612800-
dc.contributor.authorscopusid57191033826-
dc.contributor.authorscopusid56555617500-
dc.contributor.authorscopusid57219450388-
dc.contributor.authorscopusid57204481264-
dc.contributor.authorscopusid26032456900-
dc.contributor.authorscopusid7004763337-
dc.identifier.eissn1726-4189-
dc.description.lastpage4320en_US
dc.identifier.issue14-
dc.description.firstpage4305en_US
dc.relation.volume18en_US
dc.investigacionCienciasen_US
dc.type2Artículoen_US
dc.utils.revisionen_US
dc.date.coverdateJulio 2021en_US
dc.identifier.ulpgcen_US
dc.description.sjr1,548
dc.description.jcr5,092
dc.description.sjrqQ1
dc.description.jcrqQ1
dc.description.scieSCIE
dc.description.miaricds10,8
item.fulltextCon texto completo-
item.grantfulltextopen-
crisitem.author.deptGIR IOCAG: Oceanografía Biológica y Algología Aplicada-
crisitem.author.deptIU de Oceanografía y Cambio Global-
crisitem.author.deptDepartamento de Biología-
crisitem.author.orcid0000-0002-7526-7741-
crisitem.author.parentorgIU de Oceanografía y Cambio Global-
crisitem.author.fullNameArístegui Ruiz, Javier-
crisitem.author.fullNameBaños Cerón, María Isabel-
Colección:Artículos
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