georefid:2012-050487SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1016/j.quascirev.2009.10.0072010-01-01publicationgeorefid:2012-050487doi:10.1016/j.quascirev.2009.10.007Jaccard, S. L.ETH Zuerich, Geological Institute, Zurich, SwitzerlandauthorGalbraith, E. D.Universite de Versailles Saint-Quentin-en-Yvelines, FranceauthorSigman, D. M.British Antarctic Survey, United KingdomauthorHaug, G. H.McGill University, CanadaauthorElsevier, InternationalpublisherdocumentHardcopyIn: Fischer, Hubertus (editor), Masson-Delmotte, Valerie (editor), Waelbroeck, Claire (editor), Wolff, Eric W. (editor), Climate of the last million years; new insights from EPICA and other records29 (1-2)206-212Recently developed XRF core-scanning methods permit paleoceanographic reconstructions on timescales similar to those of ice-core records. We have investigated the distribution of biogenic barium (Ba/Al), opal and carbonate (Ca/Al) in a sediment core retrieved from the abyssal subarctic Pacific (ODP 882, 50 degrees N, 167 degrees E, 3244 m) over an interval that spans the full length of the EPICA Dome C (EDC) ice-core record. Ba/Al and biogenic opal show a strong resemblance to the EDC delta D and CO (sub 2) , with generally high concentrations during interglacials and lower values during ice ages of the past 800 kyrs. The sedimentary Ba/Al and biogenic opal are most easily interpreted as indicating a reduced sinking flux of organic matter from the surface ocean during cold periods. The Ba/Al maxima during peak interglacials are accompanied by transient Ca/Al peaks in these otherwise carbonate-devoid sediments, which are best explained by a deepening of the calcite lysocline, presumably due to reduced storage of respired CO (sub 2) in the deep North Pacific. For most of the "luke-warm" interglacials noted between 420 and 750 ka in EDC, the Ba/Al peaks in ODP 882 are also lower, further strengthening the evidence for a simple physical link between global climate and the biogeochemistry of the subarctic Pacific. Abstract Copyright (2010) Elsevier, B.V.completedQuaternary geologyIsotope geochemistryalkaline earth metalsaluminumAntarcticaBa/AlbariumCa/Alcalciumcarbon dioxideCenozoicchemical compositiondeuteriumDome CEmperor SeamountsEPICAframework silicatesHolocenehydrogenice coresisotopesLeg 145marine environmentmarine sedimentsmetalsNorth PacificNorthwest PacificOcean Drilling ProgramODP Site 882opalPacific OceanpaleoenvironmentPleistoceneQuaternarysedimentssilica mineralssilicatesspectrastable isotopessubarctic regionsWest PacificWilkes LandX-ray fluorescence spectraurn:org.iodp:exp:145urnlargerWorkCitationcampaignurn:org.iodp:exp:145:site:882urnlargerWorkCitationstudyurn:org.iodp:exp:145urnlargerWorkCitationcampaignEnglishgeoscientificInformation123.2100167.3600-75.060050.2148