noaa-cave-22074 Mairs Cave, Southern Australia 23-15 KYrBP Speleothem Stable Isotope Data Treble, P.C.; Baker, A.; Ayliffe, L.K.; Cohen, T.C.; Hellstrom, J.C.; Gagan, M.K.; Frisia, S.; Drysdale, R.N.; Griffiths, A.D.; Borsato, A. Mairs Cave, Southern Australia 23-15 KYrBP Speleothem Stable Isotope Data 2017-05-10 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22074 Investigator P.C. Treble Investigator A. Baker Investigator L.K. Ayliffe Investigator T.C. Cohen Investigator J.C. Hellstrom Investigator M.K. Gagan Investigator S. Frisia Investigator R.N. Drysdale Investigator A.D. Griffiths Investigator A. Borsato earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcite,null,per mil VPDB,null,speleothems,raw,continuous-flow isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems age,null,null,calendar kiloyear before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 13C,calcite,null,per mil VPDB,null,speleothems,raw,continuous-flow isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 23197 cal yr BP 14845 cal yr BP Complete -32.16 -32.16 138.83 138.83 Continent Australia/New Zealand Australia South Australia Mairs Cave>LATITUDE -32.16>LONGITUDE 138.83 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Pauline C. Treble, Andy Baker, Linda K. Ayliffe, Timothy J. Cohen, John C. Hellstrom, Michael K. Gagan, Silvia Frisia, Russell N. Drysdale, Alan D. Griffiths, and Andrea Borsato 2017 Climate of the Past 13 6 667-687 10.5194/cp-13-667-2017 http://www.clim-past.net/13/667/2017/

Terrestrial data spanning the Last Glacial Maximum (LGM) and deglaciation from the southern Australian region are sparse and limited to discontinuous sedimentological and geomorphological records with relatively large chronological uncertainties. This dearth of records has hindered a critical assessment of the role of the Southern Hemisphere mid-latitude westerly winds on the region's climate during this time period. In this study, two precisely dated speleothem records for Mairs Cave, Flinders Ranges, are presented, providing for the first time a detailed terrestrial hydroclimatic record for the southern Australian drylands during 23-15 ka. Recharge to Mairs Cave is interpreted from the speleothem record by the activation of growth, physical flood layering, and d18O and d13C minima. Periods of lowered recharge are indicated by 18O and 13C enrichment, primarily affecting d18O, argued to be driven by evaporation of shallow soil/epikarst water in this water-limited environment. A hydrological driver is supported by calcite fabric changes. These include the presence of laminae, visible organic colloids, and occasional dissolution features, related to recharge, as well as the presence of sediment bands representing cave floor flooding. A shift to slower-growing, more compact calcite and an absence of lamination is interpreted to represent reduced recharge. The Mairs Cave record indicates that the Flinders Ranges were relatively wet during the LGM and early deglaciation, particularly over the interval 18.9-15.8 ka. This wetter phase ended abruptly with a shift to drier conditions at 15.8 ka. These findings are in agreement with the geomorphic archives for this region, as well as the timing of events in records from the broader Australasian region. The recharge phases identified in the Mairs Cave record are correlated with, but antiphase to, the position of the westerly winds interpreted from marine core MD03-2611, located 550 km south of Mairs Cave in the Murray Canyons region. The implication is that the mid-latitude westerlies are located further south during the period of enhanced recharge in the Mairs Cave record (18.9-16 ka) and conversely are located further north when greater aridity is interpreted in the speleothem record. A further comparison with speleothem records from the northern Australasian region reveals that the availability of tropical moisture is the most likely explanation driving enhanced recharge, with further amplification of recharge occurring during the early half of Heinrich Stadial 1 (HS1), possibly influenced by a more southerly displaced Intertropical Convergence Zone (ITCZ). A rapid transition to aridity at 15.8 ka is consistent with a retraction of this tropical moisture source. STUDY NOTES: Two U-series age dated speleothem records for Mairs Cave, Flinders Ranges, southern Australia. Data span 23-15 ka.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/mairs2017mc-s1.txt Formatted Text Data File; Mairs Cave Stalagmite MC-S1 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/mairs2017mc-s2.txt Formatted Text Data File; Mairs Cave Stalagmite MC-S2 Stable Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11