The coupled δ13C-radiocarbon systematics of three late Glacial/early Holocene speleothems; insights into soil and cave processes at climatic transitions

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dc.contributor.author Rudzka, Dominika
dc.contributor.author McDermott, Frank
dc.contributor.author Baldini, Lisa M.
dc.contributor.author Fleitmann, Dominik
dc.contributor.author Moreno, Ana
dc.contributor.author Stoll, Heather
dc.date.accessioned 2012-06-26T16:01:25Z
dc.date.available 2012-06-26T16:01:25Z
dc.date.copyright 2011 Elsevier Ltd. en
dc.date.issued 2011-08-01
dc.identifier.citation Geochimica et Cosmochimica Acta en
dc.identifier.uri http://hdl.handle.net/10197/3705
dc.description.abstract The coupled δ13C-radiocarbon systematics of three European stalagmites deposited during the Late Glacial and early Holocene were investigated to understand better how the carbon isotope systematics of speleothems respond to climate transitions. The emphasis is on understanding how speleothems may record climate-driven changes in the proportions of biogenic (soil carbon) and limestone bedrock derived carbon. At two of the three sites, the combined δ13C and 14C data argue against greater inputs of limestone carbon as the sole cause of the observed shift to higher d13C during the cold Younger Dryas. In these stalagmites (GAR-01 from La Garma cave, N. Spain and So-1 from Sofular cave, Turkey), the combined changes in δ13C and initial 14C activities suggest enhanced decomposition of old stored, more recalcitrant, soil carbon at the onset of the warmer early Holocene. Alternative explanations involving gradual temporal changes between open- and closed-system behaviour during the Late Glacial are difficult to reconcile with observed changes in speleothem δ13C and the growth rates. In contrast, a stalagmite from Pindal cave (N. Spain) indicates an abrupt change in carbon inputs linked to local hydrological and disequilibrium isotope fractionation effects, rather than climate change. For the first time, it is shown that while the initial 14C activities of all three stalagmites broadly follow the contemporaneous atmospheric 14C trends (the Younger Dryas atmospheric 14C anomaly can be clearly discerned), subtle changes in speleothem initial 14C activities are linked to climate-driven changes in soil carbon turnover at a climate transition. en
dc.description.sponsorship Science Foundation Ireland en
dc.format.extent 31608 bytes
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dc.format.extent 134731 bytes
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dc.format.extent 340519 bytes
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dc.language.iso en en
dc.publisher Elsevier en
dc.relation.requires Biology & Environmental Science Research Collection en
dc.relation.requires Chemistry and Chemical Biology Research Colelction en
dc.relation.requires Geological Sciences Research Collection en
dc.relation.requires UCD Library Staff Research Collection en
dc.rights This is the author’s version of a work that was accepted for publication in Geochimica et Cosmochimica Acta. 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 Geochimica et Cosmochimica Acta (2011) DOI: 10.1016/j.gca.2011.05.022 en
dc.subject Speleothems en
dc.subject Delta 13C en
dc.subject Radiocarbon en
dc.subject Soil processes en
dc.subject Late Glacial en
dc.subject Early Holocene en
dc.subject Recalcitrant carbon en
dc.subject Climate changes en
dc.subject.lcsh Speleothems en
dc.subject.lcsh Carbon--Isotopes en
dc.subject.lcsh Paleoclimatology en
dc.subject.lcsh Climatic changes en
dc.title The coupled δ13C-radiocarbon systematics of three late Glacial/early Holocene speleothems; insights into soil and cave processes at climatic transitions en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.status Peer reviewed en
dc.identifier.volume 75 en
dc.identifier.issue 15 en
dc.identifier.startpage 4321 en
dc.identifier.endpage 4339 en
dc.identifier.doi 10.1016/j.gca.2011.05.022
dc.neeo.contributor Rudzka|Dominika|aut| en
dc.neeo.contributor McDermott|Frank|aut| en
dc.neeo.contributor Baldini|Lisa M.|aut| en
dc.neeo.contributor Fleitmann|Dominik|aut| en
dc.neeo.contributor Moreno|Ana|aut| en
dc.neeo.contributor Stoll|Heather|aut| en


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