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| Titel |
Paleotemperature reconstructions from speleothem fluid inclusions between 14 – 10 ka BP in Milandre cave (NW Switzerland) |
| VerfasserIn |
Stéphane Affolter, Anamaria Häuselmann, Dominik Fleitmann, Markus Leuenberger |
| 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 |
250134346
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| Publikation (Nr.) |
 EGU/EGU2016-15057.pdf |
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| Zusammenfassung |
| In cave environments, speleothems constitute a well preserved and precisely dated continental
climate archive that record past environmental changes such as paleotemperature or moisture
source, namely through oxygen and hydrogen isotopes variations. Fluid inclusions are
common in speleothems and they correspond to micrometric voids that often contain fossil
liquid water representing past precipitation falling above the cave nearly at the time the
inclusions were sealed. To measure the δD and δ18O isotopic composition of speleothem
fluid inclusions, we extracted submicrolitre amounts of water from stalagmites (old and
recent) coming from Milandre cave (Switzerland) using a new online method developed at
the University of Bern (Affolter et al., 2014). The released water is then flushed directly to a
Picarro L1102-i or L2140-i laser based instrument that allows to simultaneously
monitor hydrogen and oxygen isotopes. At Milandre cave site, a two year isotope
monitoring campaign has confirmed that isotopes in precipitation for northwestern
Switzerland are principally controlled by air temperature (Affolter et al., 2015). Therefore,
when combined with calcite δ18O, the fluid inclusion water isotopes can be used
to calculate paleotemperatures. We reconstructed a cold season biased (roughly
autumn – winter – spring) paleotemperature trend for the time interval covering the
Allerød, the Younger Dryas cold interval and the early Holocene (13’900 – 9’900
BP).
References:
Affolter S., Fleitmann D., and Leuenberger M.: New online method for water isotope
analysis of speleothem fluid inclusions using laser absorption spectroscopy (WS-CRDS),
Clim. Past, 10, 1291-1304, doi:10.5194/cp-10-1291-2014, 2014.
Affolter S., Häuselmann A.D., Fleitmann D., Häuselmann P., Leuenberger M.: Triple
isotope (δD, δ17O, δ18O) study on precipitation, drip water and speleothem fluid inclusions
for a Western Central European cave (NW Switzerland), Quat. Sci. Rev., 127, pp. 73–89,
2015. |
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