georefid:2013-034391SEDIS 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=10.1029/2010PA0019512010-01-01publicationgeorefid:2013-034391doi:10.1029/2010PA001951Bolton, Clara T.University of Southampton, National Oceanography Centre, Southampton, United KingdomauthorWilson, Paul A.University of Cardiff, United KingdomauthorBailey, IanauthorFriedrich, OliverauthorBeer, Christopher J.authorBecker, JuliaauthorBaranwal, SomaauthorSchiebel, RalfauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentHardcopyPaleoceanography25 (4)Large-amplitude millennial-scale climate oscillations have been identified in late Pleistocene climate archives from around the world. These oscillations appear to be of larger amplitude during times of enlarged ice sheets. This observation suggests the existence of a relationship between large-amplitude millennial variations in climate and extreme glacial conditions and therefore that the emergence of millennial-scale climate variability may be linked to the Pliocene intensification of northern hemisphere glaciation (iNHG). Here we test this hypothesis using new late Pliocene high-resolution ( approximately 400 year) records of ice-rafted debris deposition and stable isotopes in planktic foraminiferal calcite (Globigerinoides ruber) generated from Integrated Ocean Drilling Program Site U1313 in the subpolar North Atlantic (a reoccupation of the classic Deep Sea Drilling Project Site 607). Our records span marine oxygen isotope stages (MIS) 103-95 ( approximately 2600 to 2400 ka), the first interval during iNHG ( approximately 3.5 to 2.5 Ma) in which large-amplitude glacial-interglacial cycles and inferred sea level changes occur. Our records reveal small-amplitude variability at periodicities of approximately 1.8 to 6.2 kyr that prevails regardless of (inter)glacial state with no significant amplification during the glacials MIS 100, 98, and 96. These findings imply that the threshold for the amplification of such variability to the proportions seen in the marine archive of the last glacial was not crossed during the late Pliocene and, in view of all available data, likely not until the Mid-Pleistocene Transition.completedStratigraphyAtlantic OceanC-13/C-12carbonCenozoicchemostratigraphychronostratigraphyclimate changecoresdata processingdebrisExpedition 306Expeditions 303/306ForaminiferaFourier analysisglacial environmentglaciationice raftingIntegrated Ocean Drilling Programinterglacial environmentInvertebrataIODP Site U1313isotope ratiosisotopeslithostratigraphymarine sedimentsmicrofossilsMid-Atlantic RidgeNeogeneNorth AtlanticO-18/O-16oxygenpaleoclimatologypaleoenvironmentPlioceneProtistasea-level changessedimentationsedimentation ratessedimentsstable isotopesstatistical analysisTertiarytime series analysisupper Plioceneurn:org.iodp:exp:306urnlargerWorkCitationcampaignurn:org.iodp:exp:306:site:U1313urnlargerWorkCitationstudyurn:org.iodp:exp:306urnlargerWorkCitationcampaignEnglishgeoscientificInformation-32.5700-32.570041.000041.0000