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| Titel |
Two millennia of climate variability in the Central Mediterranean |
| VerfasserIn |
C. Taricco, M. Ghil, S. Alessio, G. Vivaldo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 5, no. 2 ; Nr. 5, no. 2 (2009-05-04), S.171-181 |
| Datensatznummer |
250002395
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| Publikation (Nr.) |
 copernicus.org/cp-5-171-2009.pdf |
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| Zusammenfassung |
This experimental work addresses the need for high-resolution, long and
homogeneous climatic time series that facilitate the study of climate
variability over time scales of decades to millennia. We present a
high-resolution record of foraminiferal δ18O from a
Central-Mediterranean sediment core that covers the last two millennia. The
record was analyzed using advanced spectral methods and shows highly
significant oscillatory components with periods of roughly 600, 350, 200, 125
and 11 years. Over the last millennium, our data show several features
related to known climatic periods, such as the Medieval Optimum, the Little
Ice Age and a recent steep variation since the beginning of the Industrial
Era. During the preceding millennium, the δ18O series also reveals
a surprising maximum at about 0 AD, suggesting low temperatures at that time.
This feature contradicts widely held ideas about the Roman Classical Period;
it is, therefore, discussed at some length, by reviewing the somewhat
contradictory evidence about this period.
We compare the δ18O record with an alkenone-derived sea
surface temperature time series, obtained from cores extracted in
the same Central-Mediterranean area (Gallipoli Terrace, Ionian Sea),
as well as with Italian and other European temperature
reconstructions over the last centuries. Based on this comparison,
we show that the long-term trend and the 200-y oscillation in the
records are temperature driven and have a dominant role in
describing temperature variations over the last two millennia. |
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