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Multidecadal changes in marine subsurface oxygenation off central Peru during the last ca. 170 years

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dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.contributor.author Sifeddine, A.
dc.contributor.author Salvatteci Merino, Franco Renato
dc.contributor.author Romero, D.
dc.contributor.author Briceño-Zuluaga, F.
dc.contributor.author Graco, M.
dc.contributor.author Anculle, T.
dc.contributor.author Almeida, C.
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.date.accessioned 2019-08-08T15:23:45Z
dc.date.available 2019-08-08T15:23:45Z
dc.date.issued 2019
dc.identifier.uri https://hdl.handle.net/20.500.12866/7138
dc.description.abstract Subsurface water masses with permanent oxygen deficiency (oxygen minimum zones, OMZ) are typically associated with upwelling regions and exhibit a high sensitivity to climate variability. Over the last decade, several studies have reported a global ocean deoxygenation trend since 1960 and a consequent OMZ expansion. However, some proxy records suggest an oxygenation trend for the OMZ over the margins of the Tropical North East Pacific since ca. 1850. At the Tropical South East Pacific, the upper Peruvian margin is permanently impinged by a shallow and intense OMZ. In this study, we aim to (1) reconstruct the (multi)decadal oxygenation variability off central Peru, and (2) to identify the influence of both largescale and local factors and the potential underlying mechanisms driving subsurface oxygenation in the Eastern Pacific. We combined a multiproxy approach in multiple paleoceanographic records for the last ~170 years with instrumental records of subsurface oxygen concentrations since 1960. We analyzed benthic foraminiferal assemblages, redox-sensitive metals (Mo, Re, U), δ15N and contents of total organic carbon and biogenic silica in multiple sediment cores collected in the upper margin off Callao (180 m) and Pisco (~300 m). An OMZ weakening over the Peruvian central margin can be inferred from 1865 to 2004. The records can be divided in three major periods, based on responses of local productivity and subsurface ventilation: (i) the mid to late 19th century, with enhanced siliceous productivity, a strong oxygen-deficient and reducing sedimentary conditions; (ii) the late 19th century to mid-twentieth century, with less oxygen-deficient and reducing sedimentary conditions, superimposed to a slight decadal-scale variability; and (iii) the late 20th century until the early 2000's, with a slight oxygenation trend. We attribute the centennial-scale oxygenation trend in the Tropical East Pacific to ventilation processes by undercurrents that decreased subsurface oxygenation even when during the same period an overall increase in export production was inferred off Peru. Unlike other upwelling areas in the Tropical East Pacific, subsurface oxygenation off Peru does not show a decrease in the last decades, instead a subtle oxygenation trend was observed close to the core of the OMZ at 200 m depth. en_US
dc.language.iso eng
dc.publisher Frontiers Media
dc.relation.ispartofseries Frontiers in Marine Science
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Peru en_US
dc.subject Benthic foraminifera en_US
dc.subject Deoxygenation en_US
dc.subject OMZ en_US
dc.subject Redox metals en_US
dc.title Multidecadal changes in marine subsurface oxygenation off central Peru during the last ca. 170 years en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.3389/fmars.2019.00270
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.11
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#2.07.07
dc.relation.issn 2296-7745


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