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| Titel |
A new approach for the interpretation of stable isotope signals in speleothems using noble gas temperatures |
| VerfasserIn |
T. Kluge, T. Marx, D. Scholz, Christoph Spötl, S. Niggemann, A. Schröder-Ritzrau, A. Mangini, W. Aeschbach-Hertig |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029073
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| Zusammenfassung |
| The development of a measurement and extraction system for noble gases contained in
speleothem fluid inclusions enables the determination of equilibration temperatures. This
so-called noble gas temperature (NGT) can be used in addition to other proxies, such as
stable oxygen and carbon isotopes or trace elements, to constrain paleoclimate changes.
Typical sample sizes are about 1 g calcite. With this quantity, and a low contribution of
air-filled inclusions to the total signal, an uncertainty of about 1-Â is achievable. Using
stalagmites from the Bunker Cave in northern Germany a NGT record was established. This
record covers different periods of the last 130 ka and offers the possibility to compare
temperature changes reconstructed from NGTs with variations in the stable isotope and trace
element data of the same stalagmite. Most noticeable is the evolution of the δ18O signal,
which shows a strong depletion during periods of increased NGTs. The comparison of
the NGTs with other climate records shows the detected temperature changes to
be consistent with variations reconstructed e.g. from pollen, ice cores and corals. |
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