noaa-cave-20589 Bunker Cave, Germany 11,000 Year Stalagmite Stable Isotope and Mg/Ca Data Fohlmeister, J.; Schröder-Ritzrau, A.; Scholz, D.; Spötl, C.; Riechelmann, D.F.C.; Mudelsee, M.; Wackerbarth, A.; Gerdes, A.; Riechelmann, S.; Immenhauser, A.; Richter, D.K.; Mangini, A. Bunker Cave, Germany 11,000 Year Stalagmite Stable Isotope and Mg/Ca Data 2016-10-04 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20589 Investigator J. Fohlmeister Investigator A. Schröder-Ritzrau Investigator D. Scholz Investigator C. Spötl Investigator D.F.C. Riechelmann Investigator M. Mudelsee Investigator A. Wackerbarth Investigator A. Gerdes Investigator S. Riechelmann Investigator A. Immenhauser Investigator D.K. Richter Investigator A. Mangini earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,null earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems magnesium/calcium,calcium carbonate,null,mole per mole,null,speleothems,raw,laser ablation,N,ratio multipied by 100 earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,composited,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems trace metals earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 10723 cal yr BP -57 cal yr BP Complete 51.3675 51.3675 7.6647 7.6647 184 184 Continent Europe Western Europe Germany Bunker Cave>LATITUDE 51.3675>LONGITUDE 7.6647 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 J. Fohlmeister, A. Schröder-Ritzrau, D. Scholz, C. Spötl, D.F.C. Riechelmann, M. Mudelsee, A. Wackerbarth, A. Gerdes, S. Riechelmann, A. Immenhauser, D.K. Richter, and A. Mangini 2012 Climate of the Past 8 1751-1764 10.5194/cp-8-1751-2012 http://www.clim-past.net/8/1751/2012/

Holocene climate was characterised by variability on multi-centennial to multi-decadal time scales. In central Europe, these fluctuations were most pronounced during winter. Here we present a record of past winter climate variability for the last 10.8 ka based on four speleothems from Bunker Cave, western Germany. Due to its central European location, the cave site is particularly well suited to record changes in precipitation and temperature in response to changes in the North Atlantic realm. We present high-resolution records of d18O, d13C values and Mg/Ca ratios. Changes in the Mg/Ca ratio are attributed to past meteoric precipitation variability. The stable C isotope composition of the speleothems most likely reflects changes in vegetation and precipitation, and variations in the d18O signal are interpreted as variations in meteoric precipitation and temperature. We found cold and dry periods between 8 and 7 ka, 6.5 and 5.5 ka, 4 and 3 ka as well as between 0.7 and 0.2 ka. The proxy signals in the Bunker Cave stalagmites compare well with other isotope records and, thus, seem representative for central European Holocene climate variability. The prominent 8.2 ka event and the Little Ice Age cold events are both recorded in the Bunker Cave record. However, these events show a contrasting relationship between climate and d18O, which is explained by different causes underlying the two climate anomalies. Whereas the Little Ice Age is attributed to a pronounced negative phase of the North Atlantic Oscillation, the 8.2 ka event was triggered by cooler conditions in the North Atlantic due to a slowdown of the thermohaline circulation. STUDY NOTES: Four stalagmites from Bunker cave - in total covering the last about 11 ka - were investigated. Each stalagmite was 230Th dated. Stable oxgen and carbon isotopes as well as Mg/Ca were measured at high resolution. Using a stacking program a stable oxygen isotope stack of the four stalagmites was generated.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu6.txt Data File; Bunker Cave Stalagmite Bu6 Stable Isotope and Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu1.txt Data File; Bunker Cave Stalagmite Bu1 Stable Isotope and Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu4.txt Data File; Bunker Cave Stalagmite Bu4 Stable Isotope and Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu2.txt Data File; Bunker Cave Stalagmite Bu2 Stable Isotope and Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012stack.txt Data File; Bunker Cave Stalagmite d18O Stack USA/NOAA DIF Version 9.8.4 2019-06-18 2019-06-18