 |
| Titel |
A high-resolution δ18O record and Mediterranean climate variability |
| VerfasserIn |
C. Taricco, G. Vivaldo, S. Alessio, S. Rubinetti, S. Mancuso |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 3 ; Nr. 11, no. 3 (2015-03-24), S.509-522 |
| Datensatznummer |
250117212
|
| Publikation (Nr.) |
 copernicus.org/cp-11-509-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| A high-resolution, well-dated foraminiferal δ18O record from
a shallow-water core drilled from the Gallipoli Terrace in the Gulf of
Taranto (Ionian Sea), previously measured over the last two millennia, has
been extended to cover 707 BC–AD 1979. Spectral analysis of this series,
performed using singular-spectrum analysis (SSA) and other classical and
advanced methods, strengthens the results obtained analysing the shorter
δ18O profile, detecting the same highly significant
oscillations of about 600, 380, 170, 130 and 11 years, respectively
explaining about 12, 7, 5, 2 and 2% of the time series total variance,
plus a millennial trend (18% of the variance). The comparison with the
results of multi-channel singular-spectrum analysis (MSSA) applied to a data
set of 26 Northern Hemisphere (NH) temperature-proxy records shows that NH
temperature anomalies share with our local record a~long-term trend and
a bicentennial (170-year period) cycle. These two variability modes, previously
identified as temperature-driven, are the most powerful modes in the NH
temperature data set. Both the long-term trends and the bicentennial
oscillations, when reconstructed locally and hemispherically, show coherent
phases. Furthermore, the corresponding local and hemispheric amplitudes are
comparable if changes in the precipitation–evaporation balance of the Ionian
sea, presumably associated with temperature changes, are taken into account. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|