Climate-induced speleothem radiocarbon variability on Socotra Island from the Last Glacial Maximum to the Younger Dryas

dc.bibliographicCitation.firstPage409eng
dc.bibliographicCitation.issue1eng
dc.bibliographicCitation.journalTitleClimate of the past : CPeng
dc.bibliographicCitation.lastPage421eng
dc.bibliographicCitation.volume16eng
dc.contributor.authorTherre, Steffen
dc.contributor.authorFohlmeister, Jens
dc.contributor.authorFleitmann, Dominik
dc.contributor.authorMatter, Albert
dc.contributor.authorBurns, Stephen J.
dc.contributor.authorArps, Jennifer
dc.contributor.authorSchröder-Ritzrau, Andrea
dc.contributor.authorFriedrich, Ronny
dc.contributor.authorFrank, Norbert
dc.date.accessioned2021-09-20T10:53:18Z
dc.date.available2021-09-20T10:53:18Z
dc.date.issued2020
dc.description.abstractIn this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate-dependent DCF. For M1-5, an average DCF of 56.2±3.4% is observed between 27 and 18kyrBP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed-system carbonate dissolution conditions. Towards the end of the last glacial period, decreasing Mg/Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and DCF as seen in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African-Indian monsoon, we propose that more humid conditions and enhanced net infiltration after the Last Glacial Maximum (LGM) led to dense vegetation and thus lowered the DCF by increasing 14CO2 input into the soil zone. At the onset of the Younger Dryas (YD) a sudden change in DCF towards much higher, and extremely variable, values is observed. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite DCF on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular relevance for speleothem studies that aim to reconstruct past atmospheric 14C (e.g., for the purposes of 14C calibration), as these would rely on largely climate-independent soil carbon cycling above the cave. © 2020 Copernicus GmbH. All rights reserved.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/6856
dc.identifier.urihttps://doi.org/10.34657/5903
dc.language.isoengeng
dc.publisherKatlenburg-Lindau : Copernicus Ges.eng
dc.relation.doihttps://doi.org/10.5194/cp-16-409-2020
dc.relation.essn1814-9332
dc.relation.issn1814-9324
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subject.ddc550eng
dc.subject.otherdissolutioneng
dc.subject.otherinfiltrationeng
dc.subject.otherLast Glacial Maximumeng
dc.subject.otherpaleoclimateeng
dc.subject.otherradiocarbon datingeng
dc.subject.othersoil organic mattereng
dc.subject.otherspeleothemeng
dc.subject.otherstalagmiteeng
dc.subject.otherYounger Dryaseng
dc.subject.otherArabian Seaeng
dc.subject.otherArkhabil Suqutraeng
dc.subject.otherIndian Oceaneng
dc.subject.otherYemeneng
dc.titleClimate-induced speleothem radiocarbon variability on Socotra Island from the Last Glacial Maximum to the Younger Dryaseng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorPIKeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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