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. 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. 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 earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Bunker Cave>LATITUDE 51.3675>LONGITUDE 7.6647) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Fohlmeister, J. Investigator : Schröder-Ritzrau, A. Investigator : Scholz, D. Investigator : Spötl, C. Investigator : Riechelmann, D.F.C. Investigator : Mudelsee, M. Investigator : Wackerbarth, A. Investigator : Gerdes, A. Investigator : Riechelmann, S. Investigator : Immenhauser, A. Investigator : Richter, D.K. Investigator : Mangini, A. 2016-10-04 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20589 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012stack.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012stack.txt English https://www.ncdc.noaa.gov/paleo/study/20589 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012bu2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/germany/bunker2012stack.txt 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. Mangini2012Bunker Cave stalagmites: an archive for central European Holocene climate variabilityClimate of the Past81751-176410.5194/cp-8-1751-2012http://www.clim-past.net/8/1751/2012/ START YEAR: 10723 cal yr BP * END YEAR: -57 cal yr BP 7.6647 51.3675 7.6647 51.3675