Hydrological influence on the dead carbon fraction in a tropical speleothem during the Younger Dryas and the Last Millennium

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dc.contributor.authorGriffiths, MLen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorBajo, Pen_AU
dc.contributor.authorJenkins, Den_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorJohnson, KRen_AU
dc.contributor.authorGagan, MKen_AU
dc.contributor.authorZhao, JXen_AU
dc.date.accessioned2016-06-03T00:34:22Zen_AU
dc.date.available2016-06-03T00:34:22Zen_AU
dc.date.issued2015-11-16en_AU
dc.date.statistics2016-06-03en_AU
dc.description.abstractThe number of paleoclimate records derived from speleothems has increased significantly in recent years. In addition, speleothems have been used for calibration of the radiocarbon timescale beyond the range of the tree-ring record. One critical issue for reliable speleothem-based radiocarbon calibration and 14C dating of speleothems is constraining the temporal variations in the radioactively dead carbon (i.e. dead carbon fraction (DCF)) that is incorporated into this archive and to determine the potential mechanisms driving such changes. While some studies have shown insignificant variations in DCF through time and highlighted the potential utility of speleothems to extend/improve the radiocarbon calibration curve, others have reported significant temporal variability in speleothem DCF associated with changes in cave recharge. To further assess the potential hydrological control on speleothem radiocarbon variability, we constructed a new high-resolution DCF record from a speleothem from Flores, Indonesia for two different time periods, the Younger Dryas (YD) chronozone and the Last Millennium. A total of thirty-four 14C analyses (twenty for the YD and fourteen for the Last Millennium) were conducted on pieces of calcite extracted from stalagmite LR06-B1, which was well-dated by ~90 U-Th ages. To better characterize the paleoclimate and environmental changes, high-resolution stable-isotope (δ18O, δ13C) and trace-element (Mg/Ca, Sr/Ca) measurements were also conducted along the same sections of stalagmite. Broad comparison of the DCF record with the hydrologically-controlled proxy data suggests that increases in rainfall were matched by DCF increases. In line with a previous interpretation of DCF variability for the same specimen, but during the time interval 2.4-2.8 cal kyr BP and the post-bomb period, we interpret the DCF during the YD and the Last Millennium to have been primarily controlled by limestone dissolution associated with changes in open- versus closed-system conditions, rather than other potential factors such as kinetic fractionation and/or variations in the age-spectrum of soil organic matter above the cave. American Geophysical Union, Fall Meeting 2015en_AU
dc.identifier.citationGriffiths, M. L., Hua, Q., Drysdale, R., Bajo, P., Jenkins, D., Hellstrom, J. C., Johnson, K. R., Gagan, M. K., Zhao, J. X. (2015). Hydrological influence on the dead carbon fraction in a tropical speleothem during the Younger Dryas and the Last Millennium. AGU Fall Meeging December 14 - 18, 2015. San Francisco, America.en_AU
dc.identifier.conferenceenddate18 December 2015en_AU
dc.identifier.conferencenameAGU Fall Meegingen_AU
dc.identifier.conferenceplaceSan Francisco, Americaen_AU
dc.identifier.conferencestartdate14 December 2015en_AU
dc.identifier.govdoc6420en_AU
dc.identifier.otherPP31A-2202en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm15/webprogram/Paper60926.htmlen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6897en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophyical Unionen_AU
dc.subjectHydrologyen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectCarbonen_AU
dc.subjectIsotope datingen_AU
dc.subjectTropical regionsen_AU
dc.subjectSoilsen_AU
dc.titleHydrological influence on the dead carbon fraction in a tropical speleothem during the Younger Dryas and the Last Millenniumen_AU
dc.typeConference Abstracten_AU
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