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A high-resolution δ18O record and Mediterranean climate variability

Taricco, Carla and Vivaldo, Gianna and Alessio, Silvia and Rubinetti, Sara and Mancuso, Salvatore A high-resolution δ18O record and Mediterranean climate variability. Climate of the Past , 11 (3). pp. 509-522. ISSN 1814-9324 (2015)

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Abstract

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–1979 AD. Spectral analysis of this series, performed by 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 yr, 380 yr, 170 yr, 130 yr, and 11 yr, 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 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. Also 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.

Item Type: Article
Identification Number: 10.5194/cpd-10-4057-2014
Subjects: Q Science > QC Physics
Q Science > QE Geology
Research Area: Economics and Institutional Change
Depositing User: Gianna Vivaldo
Date Deposited: 11 Nov 2014 14:40
Last Modified: 31 Mar 2015 13:54
URI: http://eprints.imtlucca.it/id/eprint/2368

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