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The response of the Peruvian Upwelling Ecosystem to centennial-scale global change during the last two millennia

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dc.contributor.author Salvatteci Merino, Franco Renato
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Field, D.
dc.contributor.author Sifeddine, A.
dc.contributor.author Ortlieb, L.
dc.contributor.author Bouloubassi, I.
dc.contributor.author Boussafir, M.
dc.contributor.author Boucher, H.
dc.contributor.author Cetin, F.
dc.date.accessioned 2020-06-10T18:11:37Z
dc.date.available 2020-06-10T18:11:37Z
dc.date.issued 2014
dc.identifier.uri https://hdl.handle.net/20.500.12866/8040
dc.description.abstract The tropical Pacific ocean-atmosphere system influences global climate on interannual, decadal, as well as longer timescales. Given the uncertainties in the response of the tropical Pacific to increasing greenhouse gasses, it is important to assess the role of the tropical Pacific climate variability in response to past global changes. The Peruvian Upwelling Ecosystem (PUE) represents an ideal area to reconstruct past changes in the eastern tropical Pacific region because productivity and subsurface oxygenation are strongly linked to changes in the strength of the Walker circulation. Throughout the last 2000 years, warmer (the Roman Warm Period-RWP; the Medieval Climate Anomaly-MCA; and the Current Warm Period-CWP), and colder (the Dark Ages Cold Period-DACP-and Little Ice Age-LIA) intervals were identified in the Northern Hemisphere (NH). We use a multi-proxy approach including organic and inorganic proxies in finely laminated sediments retrieved off Pisco (∼14° S), Peru to reconstruct the PUE response to these climatic periods. Our results indicate that the centennial-scale changes in precipitation are associated with changes in the Intertropical Convergence Zone (ITCZ) meridional displacements and expansion/contraction of the South Pacific Sub-tropical High (SPSH). Additionally, during the NH cold periods, the PUE exhibited an El Niño-like mean state, characterized by a weak oxygen minimum zone (OMZ), and low marine productivity. In contrast, during the RWP, the last stage of the MCA and the CWP, the PUE exhibited a La Niña-like mean state, characterized by an intense OMZ and high marine productivity. Comparing our results with other relevant paleoclimatic reconstructions revealed that changes in the Walker circulation strength and the SPSH expansion/contraction controlled marine productivity and OMZ intensity changes during the past two millennia. en_US
dc.language.iso eng
dc.publisher Copernicus Publications
dc.relation.ispartofseries Climate of the Past
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 Pacific Ocean en_US
dc.subject upwelling en_US
dc.subject reconstruction en_US
dc.subject Ica en_US
dc.subject Pisco en_US
dc.subject paleoclimate en_US
dc.subject anticyclone en_US
dc.subject greenhouse gas en_US
dc.subject climate variation en_US
dc.subject Little Ice Age en_US
dc.subject oxygenation en_US
dc.subject Pacific Ocean (Tropical) en_US
dc.subject paleoceanography en_US
dc.subject oxygen minimum layer en_US
dc.subject air-sea interaction en_US
dc.subject biological production en_US
dc.subject global change en_US
dc.subject global climate en_US
dc.subject intertropical convergence zone en_US
dc.subject lamination en_US
dc.subject Northern Hemisphere en_US
dc.subject Roman era en_US
dc.subject Walker circulation en_US
dc.title The response of the Peruvian Upwelling Ecosystem to centennial-scale global change during the last two millennia en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.5194/cp-10-715-2014
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.00
dc.relation.issn 1814-9332


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