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| Titel |
A high-resolution, 2700-year long δ¹⁸O record measured in a shallow-water Ionian Sea core |
| VerfasserIn |
Carla Taricco, Silvia Alessio, Gianna Vivaldo, Michael Ghil |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042927
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| Zusammenfassung |
| In a recent paper (Taricco et al., Clim. Past, 2009), we analyzed and discussed a
high-resolution δ18O profile, which covers the last two millennia. This profile was measured
in the accurately dated GT90-3 sediment core drilled in the Gallipoli Terrace of the Gulf of
Taranto (Ionian Sea). Such records provide a long and homogeneous basis for studying past
climate variations on decadal-to-millennial time scales.
We present here the extension of this record back to 700 B.C. Spectral analyses of the
extended record — performed by using both classical and advanced methods (Ghil et al., Rev.
Geophys., 2002) — confirm the presence of the highly significant oscillatory components
found in the earlier work. The oscillatory modes in both the original and extended record
include periods of roughly 600, 350, 200, 125, and 11 years. Detailed reconstruction
of each mode in the original and extended record shows that edge effects in the
modes that were detected in the previously published δ18O profile are actually
negligible.
The extended record is discussed in comparison with temperature series deduced from
other proxy indicators and other locations. |
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