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| Titel |
Reconstruction of past climate variability in SE Spain between 14 and 8 ka |
| VerfasserIn |
Alexander Budsky, Denis Scholz, Regina Mertz-Kraus, Christoph Spötl, Luis Gibert, Klaus Peter Jochum, Meinrat O. Andreae |
| 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 |
250133646
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| Publikation (Nr.) |
 EGU/EGU2016-14281.pdf |
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| Zusammenfassung |
| In comparison to the large climatic oscillations during the Pleistocene, Holocene climate only
underwent minor changes. Nevertheless, cyclic climate changes also occurred during the
Holocene. The Bond events, represented by the presence of cold, ice-bearing waters from the
north of Iceland as far south as the latitude of Britain, occurred at a cyclicity of about 1500 a
and were particularly pronounced during the Early Holocene. However, their climatic impact
on the terrestrial realm was not consistent over Europe, in particular with respect to changes
in precipitation.
Here we present a precisely dated high-resolution flowstone record from Cueva Victoria,
SE Spain, a site well suited to study the competing influence of the Atlantic and
Mediterranean Sea on the southern Iberian Peninsula. We sampled several flowstones
with a thickness of up to 60 cm. 230Th/U-dating has shown that these deposits
mainly formed during relatively warm climate intervals of the Middle and Late
Pleistocene, i.e. interglacials and interstadials (Budsky et al., 2015; Gibert et al.,
2016).
Here we focus on a short (11 cm) flowstone sequence from the Holocene with a high
temporal resolution (centennial for stable isotopes and annual for trace elements). The
flowstone grew between 14 and ca. 8 ka b2k. The decreasing trend of the δ18O and δ13C
values as well as of several trace elements between 12 and 11 ka b2k reflects an increase in
temperature and precipitation at the beginning of the Holocene. In particular, Sr and Mg show
a trend towards low and stable values. Subsequently, from 10.5 to 8 ka b2k, the δ13C values
show a high variability (-11 to -4 ), whereas the δ18O values are rather stable (between -6
and -7 ). Maxima in δ13C are interpreted as drier conditions in response to Bond events.
These events possibly led to a change of the atmospheric circulation, affecting the vegetation
in SE Spain, which evolved towards an open C3 vegetation at ca. 8 ka b2k concomitant with
drier conditions.
Budsky, A., Scholz, D., Gibert, L., Mertz-Kraus, R., 2015. 230Th/U-dating of the Cueva
Victoria flowstone sequence: Preliminary results and paleoclimate implications, in: Gibert,
L., Ferràndez-Canadell, C. (Eds.), Geology and Paleontology of Cueva Victoria. Mastia
11-13, Cartagena, pp. 101–109.
Gibert, L., Scott, G.R., Scholz, D., Budsky, A., Ferràndez, C., Ribot, F., Martin, R.A.,
Lería, M., 2016. Chronology for the Cueva Victoria fossil site (SE Spain): Evidence for
Early Pleistocene Afro-Iberian dispersals. Journal of Human Evolution 90, 183–197. |
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