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| Titel |
Timing and duration of climate variability during the 8.2 ka event
reconstructed from four speleothems from Germany |
| VerfasserIn |
Sarah Wenz, Denis Scholz, Christoph Spötl, Birgit Plessen, Simon Mischel, Sebastian F. M. Breitenbach, Klaus Peter Jochum, Jens Fohlmeister |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132242
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| Publikation (Nr.) |
 EGU/EGU2016-12731.pdf |
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| Zusammenfassung |
| The most prominent climate anomaly of the Holocene is the 8.2 ka event, which reflects the
impact of a dramatic freshwater influx into the North Atlantic during an interglacial climate
state. Thus, it can be considered as a possible analogue for future climate change. Due
to the short-lived nature of the event (160.5 ± 5.5 years; Thomas et al., 2007), a
detailed investigation requires archives of both high temporal resolution and accurate
chronology.
We present high-resolution stable oxygen and carbon isotope (ca. 3-4 years) as well as
sub-annually resolved trace element records of the 8.2 ka event from stalagmites (BB-3, Bu4,
HLK2 and TV1) from three cave systems in Germany (Blessberg Cave, Bunker Cave and
Herbstlabyrinth). The location of these caves in central European is well suited in order to
detect changes in temperature and precipitation in relation to changes in the North Atlantic
region (Fohlmeister et al., 2012). The 8.2 ka event is clearly recorded as a pronounced
negative excursion in the δ18O values of all four speleothems. While stalagmites BB-3 from
Blessberg Cave and Bu4 from Bunker Cave also show a negative excursion in the
δ13C values during the event, the two speleothems from Herbstlabyrinth show no
distinctive features in their δ13C values. The timing, duration and structure of the event
differ between the individual records. In BB-3, the event occurs earlier (ca. 8.4 ka)
and has a relatively short duration of ca. 90 years. In Bu4, the event occurs later
(ca. 8.1 ka) and shows a relatively long duration of more than 200 years. In the
two speleothems from the Herbstlabyrinth, the event is replicated and has a timing
between 8.3 and 8.1 ka and a duration of ca. 150 years. These differences may at least
in part be related to the dating uncertainties of 100-200 years (95 % confidence
limits).
References:
Fohlmeister, J., Schroder-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., 2012. Bunker Cave stalagmites: an archive for central European Holocene
climate variability. Climate of the Past 8, 1751-1764.
Thomas, E.R., Wolff, E.W., Mulvaney, R., Steffensen, J.P., Johnsen, S.J., Arrowsmith, C.,
White, J.W.C., Vaughn, B., Popp, T., 2007. The 8.2 ka event from Greenland ice cores.
Quaternary Science Reviews 26, 70-81. |
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