A first evaluation of the spatial gradients in δ18Orecorded by European Holocene speleothems

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dc.contributor.author McDermott, Frank
dc.contributor.author Atkinson, Tim
dc.contributor.author Fairchild, Ian J.
dc.contributor.author Baldini, Lisa M.
dc.contributor.author Mattey, David P.
dc.date.accessioned 2012-06-26T13:38:49Z
dc.date.available 2012-06-26T13:38:49Z
dc.date.copyright 2011 Elsevier B.V. en
dc.date.issued 2011-12
dc.identifier.citation Global and Planetary Change en
dc.identifier.uri http://hdl.handle.net/10197/3697
dc.description.abstract Oxygen isotope data for well dated Holocene speleothems from Europe have been compiled for the first time. The data were analysed at 1 ka time slices through the Holocene by taking averages of 50 year duration. After filtering the data to exclude high altitude, high latitude and sites proximal to the Mediterranean Sea, the data exhibit surprisingly tight linear correlations between speleothem O isotope values and longitude. The slope of the data on δ18O vs. longitude plots changes systematically from the early to the late Holocene, exhibiting a much steeper zonal gradient in the early Holocene. Changes in the isotope gradient through the course of the Holocene reflect both a gradual increase in δ18O in speleothems from the western margin of the transect and a simultaneous decrease in speleothem δ18O on the eastern end of the transect. These changes follow summer insolation trends through most of the Holocene, but show marked deviations from c. 4 ka to the present day. Steeper early Holocene zonal isotope gradients are attributed primarily to a combination of early Holocene warming in the west and intense convective rainfall over the European continent in summer time driven by high early Holocene summer insolation. Although the absolute δ18O values preserved in speleothems do not precisely reflect the equilibrium values with respect to the waters from which they are precipitated, the tight isotope-longitude correlations indicate that speleothems are reliable recorders of combined rainfall O isotope signals and air temperature. en
dc.description.sponsorship Science Foundation Ireland en
dc.format.extent 1455713 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.requires Geological Sciences Research Collection en
dc.rights This is the author’s version of a work that was accepted for publication in Global and Planetary Change. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Global and Planetary Change (Volume 79, Issues 3–4, December 2011, Pages 275–287) DOI: 10.1016/j.gloplacha.2011.01.005 en
dc.subject Speleothems en
dc.subject Oxygen isotopes en
dc.subject Isotope gradients en
dc.subject Holocene en
dc.subject Climate Change en
dc.subject Palaeoclimate en
dc.subject.lcsh Speleothems en
dc.subject.lcsh Oxygen--Isotopes en
dc.subject.lcsh Paleoclimatology--Holocene en
dc.subject.lcsh Climatic changes en
dc.title A first evaluation of the spatial gradients in δ18Orecorded by European Holocene speleothems en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.status Peer reviewed en
dc.identifier.volume 79 en
dc.identifier.issue 3-4 en
dc.identifier.startpage 275 en
dc.identifier.endpage 287 en
dc.citation.other Rapid climate change: lessons from the recent geological past en
dc.identifier.doi 10.1016/j.gloplacha.2011.01.005
dc.neeo.contributor McDermott|Frank|aut| en
dc.neeo.contributor Atkinson|Tim|aut| en
dc.neeo.contributor Fairchild|Ian J.|aut| en
dc.neeo.contributor Baldini|Lisa M.|aut| en
dc.neeo.contributor Mattey|David P.|aut| en
dc.description.admin au, ab. kpw22/6/12 en

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