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| Titel |
Climatic evolution of Marine Isotope Stage 5 and particularly the Eemian reconstructed from precisely dated speleothems from western Germany |
| VerfasserIn |
Denis Scholz, Dirk L. Hoffmann, Christoph Spötl, Peter Hopcroft, Klaus Peter Jochum, Detlev K. Richter |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110798
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| Publikation (Nr.) |
 EGU/EGU2015-10835.pdf |
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| Zusammenfassung |
| We present high-resolution δ18O, δ13C and trace element profiles for three stalagmites from
western Germany, which grew during Marine Isotope Stage (MIS) 5. All stalagmites
were precisely dated by MC-ICPMS 230Th/U-dating. Stalagmite HBSH-1 from
Hüttenbläserschachthöhle grew between 130 and 80Âka and provides a climate record with
decadal to centennial resolution. The other two stalagmites grew faster than HBSHÂ1, but
their growth phases are shorter. Stalagmite HBSHÂ5 grew between 129 and 122Âka, whereas
stalagmite BRÂ5 grew between 126 and 122Âka.
The record of HBSHÂ1 shows four growth interruptions coinciding with Greenland
Stadials (GS) 21, 22, 24, 25, and 26. This shows that stalagmite growth is a very sensitive
proxy for cool and dry conditions in the northern hemisphere and enables us to precisely
determine the timing and duration of the GS.
We interpret stalagmite δ18O values as a proxy for supra-regional temperature changes in
the North Atlantic realm, which is paticularly evident from their close resemblance with the
δ18O values of the NGRIP and NEEM ice core records. Stalagmite δ13C values primarily
reflect changes in hydrological balance and (local) vegetation and are, thus, a proxy for
terrestrial climate change in central European. The δ13C record shows three pronounced
negative peaks during MIS 5, and their timing is in agreement with MIS 5e, 5c and 5a.
This suggests generally warm and humid climate in central Europe during these
phases.
The evolution of the δ18O and δ13C values during the Eemian is not parallel. The δ18O
values progressively increase from 130Âka, peak at 125Âka and subsequently show a gradual
decrease. The δ13C values, in contrast, start to decrease at 123Âka, show a negative peak at
120Âka and an aprupt increase at 114Âka. This suggests that the Eemian sensu strictu lasted
from 124 to 114Âka, in agreement with a marine record from the Norwegian Sea and
indicates and a strong influence on central European climate from high northern
latitudes. We also compare our records with other MISÂ5 climate records and climate
modelling simulations performed with the general circulation model FAMOUS. |
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