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dc.contributor.authorPovea, Patricia-
dc.contributor.authorCacho, Isabel-
dc.contributor.authorMoreno Caballud, Ana-
dc.contributor.authorPena, Leopoldo-
dc.contributor.authorMenéndez, Melisa-
dc.contributor.authorCalvo, Eva María-
dc.contributor.authorCanals, Miquel-
dc.contributor.authorRobinson, Rebecca S.-
dc.contributor.authorMéndez, Fernando J.-
dc.contributor.authorFlores, José Abel-
dc.identifierdoi: 10.1002/2015PA002883-
dc.identifierissn: 0883-8305-
dc.identifiere-issn: 1944-9186-
dc.identifier.citationPaleoceanography 31(5): 522-538 (2016)-
dc.description17 pages, 6 figures, 1 table, supporting information https://dx.doi.org/10.1002/2015PA002883, data will be available at the Scientific Earth Drilling Information Service (http://sedis.iodp.org), Pangaea website (http://www.pangaea.de), and NOAA Paleoclimatology (https://www.ncdc.noaa.gov/data-access/paleoclimatology-data)-
dc.description.abstractHere we present a new set of high-resolution early Pleistocene records from the eastern equatorial Pacific (EEP). Sediment composition from Ocean Drilling Program Sites 1240 and 1238 is used to reconstruct past changes in the atmosphere-ocean system. Particularly remarkable is the presence of laminated diatom oozes (LDOs) during glacial periods between 1.85 and 2.25 Ma coinciding with high fluxes of opal and total organic carbon. Relatively low lithic particles (coarse and poorly sorted) and iron fluxes during these glacial periods indicate that the increased diatom productivity did not result from dust-stimulated fertilization events. We argue that glacial fertilization occurred through the advection of nutrient-rich waters from the Southern Ocean. In contrast, glacial periods after 1.85 Ma are characterized by enhanced dust transport of finer lithic particles acting as a new source of nutrients in the EEP. The benthic ecosystem shows dissimilar responses to the high productivity recorded during glacial periods before and after 1.85 Ma, which suggests that the transport processes delivering organic matter to the deep sea also changed. Different depositional processes are interpreted to be the result of two distinct glacial positions of the Intertropical Convergence Zone (ITCZ). Before 1.85 Ma, the ITCZ was above the equator, with weak local winds and enhanced wet deposition of dust. After 1.85 Ma, the glacial ITCZ was displaced northward, thus bringing stronger winds and stimulating upwelling in the EEP. The glacial period at 1.65 Ma with the most intense LDOs supports a rapid southward migration of the ITCZ comparable to those glacial periods before 1.85 Ma-
dc.description.sponsorshipThis work has been funded by Ministerio de Ciencia e Innovación Project GRACCIE (CONSOLIDER-INGENIO CSD 2007-00067) and ACDC project (CTM 2009-08849). The ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions. Grup de Recerca Consolidat en Geociències Marines is funded by Generalitat de Catalunya autonomous government through its excellence research groups program (reference 2014 SGR 1068). The paleostudy program (European Science Foundation) provided the funding necessary to AM to carry out the XRF core scanner analysis in the University of Bremen-
dc.publisherAmerican Geophysical Union-
dc.relation.isversionofPublisher's version-
dc.titleAtmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene-
dc.description.versionPeer Reviewed-
dc.contributor.funderEuropean Science Foundation-
dc.contributor.funderGeneralitat de Catalunya-
dc.contributor.funderNational Science Foundation (US)-
dc.contributor.funderMinisterio de Ciencia e Innovación (España)-
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