noaa-cave-23330 Kingston, New Mexico Greenland Stadial 20 Speleothem Stable Isotope Data Polyak, V.J.; Asmerom, Y.; Lachniet, M.S. Kingston, New Mexico Greenland Stadial 20 Speleothem Stable Isotope Data 2018-01-18 NCDC-Paleoclimatology ONLINE Files 10.7289/V5FX77QD https://www.ncdc.noaa.gov/paleo/study/23330 Investigator V.J. Polyak Investigator Y. Asmerom Investigator M.S. Lachniet earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil,null,speleothems,null,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,distance from top earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil,null,speleothems,null,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems age,null,unspecified margin of error,year,null,speleothems,null,null,N,absolute error range plus or minus earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 86095 cal yr BP 69324 cal yr BP Complete 32.9167 32.9167 -107.7167 -107.7167 Continent North America United States Of America New Mexico Kingston>LATITUDE 32.9167>LONGITUDE -107.7167 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 Victor J. Polyak, Yemane Asmerom, Matthew S. Lachniet 2017 Geology 45 9 843-846 10.1130/G39149.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/45/9/843/353465/rapid-speleothem-13c-change-in-southwestern-north

The characteristics of Greenland ice core stadial 20 (GS-20), the first stadial of Marine Isotope Stage 4 at the onset of the most recent glacial period, have been linked to atmospheric aerosol forcing associated with the massive 74 ka Toba (Indonesia) supereruption. More precise 40Ar/39Ar dates are available for the timing of the Toba supereruption, but while greatly improved, ice core records are not tied to absolute chronologies over this specific time interval to test for synchronicity. Here we show a rapid transition to drought conditions in the southwestern United States from a rise in a moisture-sensitive d13C time series of stalagmite KR1 from southwestern New Mexico (USA) at precisely 74.19 +/- 0.22 ka. The rapid rise in d13C in stalagmite KR1 is synchronous with the Toba supereruption 40Ar/39Ar dates within 2S absolute age error, and shows a distinct peak that started and ended abruptly, and lasted ~1560 yr. The d18O time series follows Northern Hemisphere summer insolation, and the absence of a prominent d18O anomaly at 74 ka suggests that the atmospheric response in the southwestern United States was dominated by moisture and atmospheric CO2, not temperature or moisture source variations. The coincidence of the initiation of southwest aridity at the time of the Toba supereruption is consistent with an interpretation that the eruption caused far-reaching climate change; however, climatic anomalies such as this Greenland stadial would thus likely require long process-time feedback systems related to glacial thresholds to sustain the less than decadal-long volcanic-induced atmospheric interferences. The debate regarding the role of the Toba supereruption as a possible trigger of GS-20 requires robust chronologies to resolve and advance our understanding of the potential climatic triggers and feedbacks related to this event. Our chronology offers an independent tie to the Greenland ice core record and supports the possibility of a Toba supereruption trigger of GS-20. STUDY NOTES: Speleothem stable isotope (d13C and d18O) data from speleothem KR1 collected near Kingston, New Mexico, USA, for the interval 86-69 KYrBP.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/newmexico/kingston2017d13c.txt NOAA Template File; Kingston Stalagmite KR-1 d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/newmexico/kingston2017d18o.txt NOAA Template File; Kingston Stalagmite KR-1 d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11