000061586 001__ 61586
000061586 005__ 20190131144204.0
000061586 0247_ $$2doi$$a10.1002/2015PA002883
000061586 0248_ $$2sideral$$a95332
000061586 037__ $$aART-2016-95332
000061586 041__ $$aeng
000061586 100__ $$aPovea, P.
000061586 245__ $$aAtmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene
000061586 260__ $$c2016
000061586 5060_ $$aAccess copy available to the general public$$fUnrestricted
000061586 5203_ $$aHere 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.
000061586 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CSD2007-00067$$9info:eu-repo/grantAgreement/ES/MINECO/CTM2009-08849
000061586 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000061586 590__ $$a3.254$$b2016
000061586 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b37 / 188 = 0.197$$c2016$$dQ1$$eT1
000061586 591__ $$aPALEONTOLOGY$$b1 / 53 = 0.019$$c2016$$dQ1$$eT1
000061586 591__ $$aOCEANOGRAPHY$$b8 / 62 = 0.129$$c2016$$dQ1$$eT1
000061586 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000061586 700__ $$aCacho, I.
000061586 700__ $$0(orcid)0000-0001-7357-584X$$aMoreno, A.$$uUniversidad de Zaragoza
000061586 700__ $$aPena, L. D.
000061586 700__ $$aMenéndez, M.
000061586 700__ $$aCalvo, E.
000061586 700__ $$aCanals, M.
000061586 700__ $$aRobinson, R. S.
000061586 700__ $$aMéndez, F. J.
000061586 700__ $$aFlores, J. -A
000061586 7102_ $$12000$$2427$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Externa
000061586 773__ $$g31, 5 (2016), 522-538$$pPaleoceanography$$tPALEOCEANOGRAPHY$$x0883-8305
000061586 8564_ $$s3581378$$uhttps://zaguan.unizar.es/record/61586/files/texto_completo.pdf$$yVersión publicada
000061586 8564_ $$s130226$$uhttps://zaguan.unizar.es/record/61586/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000061586 909CO $$ooai:zaguan.unizar.es:61586$$particulos$$pdriver
000061586 951__ $$a2019-01-31-14:40:41
000061586 980__ $$aARTICLE