georefid:2011-000638SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2011-000638<gco:CharacterString>Patterns of millennial variability over the last 500 ka</gco:CharacterString>2010-01-01publicationgeorefid:2011-000638Siddall, MarkUniversity of Bristol, Department of Earth Science, Bristol, United KingdomauthorRohling, Eelco J.National Oceanography Centre, Southampton, United KingdomauthorBlunier, ThomasUniversity of Copenhagen, DenmarkauthorSpahni, RenatoUniversity of Bern, SwitzerlandauthorCopernicus, Katlenburg-Lindau, InternationalpublisherdocumentDigitalClimate of the Past6 (3)295-303Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession via sea-ice feedbacks and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods.completedQuaternary geologyalbedoaliphatic hydrocarbonsalkanesAntarcticaAtlantic Oceanatmospheric circulationCenozoicclimate changeclimate forcingcyclesDansgaard-Oeschger cyclesdeuteriumDome CEPICAglacial environmentglacial geologyglaciationhydrocarbonshydrogeniceice raftingice sheetsIndian Oceaninsolationisotopeslast glacial maximumLeg 162methaneMIS 3North AtlanticNorthern HemisphereOcean Drilling ProgramODP Site 980organic compoundspaleoclimatologyprecessionQuaternaryRed Seasea-level changesRockall Banksea icestable isotopesWilkes Landurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:980urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignEnglishgeoscientificInformation-14.4208-14.420855.290655.2906Part of special issue no. 29, Retrospective views on our planet's future - PAGES open science meeting 2009, edited by Kiefer, T., et al., http://www.clim-past.net/special_issue29.html; published in Climate of the Past Discussion: 29 January 2010, http://www.clim-past-discuss.net/6/19/2010/cpd-6-19-2010.html; accessed in Oct., 2010; abstract: doi:10.5194/cp-6-295-2010application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.clim-past.net/6/295/2010/cp-6-295-2010.pdfdownload