Bunker cave stalagmites: An archive for central European Holocene climate variability


Contact
Manfred.Mudelsee [ at ] awi.de

Abstract

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 new 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 δ18O, δ13C values and Mg/Ca ratios. We attribute changes in the Mg/Ca ratio to variations in the meteoric precipitation. The stable C isotope composition of the speleothems most likely reflects changes in vegetation and precipitation and variations in the δ18O signal are interpreted as variations in meteoric precipitation and temperature. We found cold and dry periods between 9 and 7 ka, 6.5 and 5.5 ka, 4 and 3 ka as well as between 0.7 to 0.2 ka. The proxy signals in our 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 δ18O, 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.



Item Type
Article
Authors
Divisions
Programs
Peer revision
Peer-reviewed
Publication Status
Published
Eprint ID
32491
DOI 10.5194/cpd-8-1687-2012

Cite as
Fohlmeister, J. , Schröder-Ritzrau, A. , Scholz, D. , Spötl, C. , Riechelmann, D. , Mudelsee, M. , Wackerbarth, A. , Gerdes, A. , Riechelmann, S. , Immenhauser, A. , Richter, D. and Mangini, A. (2012): Bunker cave stalagmites: An archive for central European Holocene climate variability , Climate of the Past, 8 , pp. 1751-1764 . doi: 10.5194/cpd-8-1687-2012


Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item