Wavelet analysis of δ18O and δ18C time-series from an Holocene speleothem record from Corchia Cave (Central Italy): Insights for the recurrence of dry-wet periods in the central mediterranean

A Tognarelli; G Zanchetta; E Regattieri; I Isola; RN Drysdale; M Bini; JC Hellstrom

Journal article

Wavelet analysis of δ18O and δ18C time-series from an Holocene speleothem record from Corchia Cave (Central Italy): Insights for the recurrence of dry-wet periods in the central mediterranean

A Tognarelli, G Zanchetta, E Regattieri, I Isola, RN Drysdale, M Bini, JC Hellstrom

Italian Journal of Geosciences | SOC GEOLOGICA ITALIANA | Published : 2018

DOI: 10.3301/IJG.2017.21

Abstract

In this work, the continuous wavelet transform (CWT) is used to analyse stable isotope (δ18O and δ13C) time-series from a speleothem from Corchia Cave (Apuan Alps, Tuscany, central Italy). The record spans the ca. 13.3-0.4 ka period. Both proxies are thought to represent changes in the amount of precipitation and in the hydrological recharge over the cave catchment, and to indicate alternating wetter and drier periods. The CWT shows the presence of different dominant frequency components, changing across the Middle-Holocene. This can be interpreted as mostly related to long term variations in summer and winter insolation, resulting from changes in orbital parameters. The lower frequencies (m..

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University of Melbourne Researchers

Russell Drysdale Author

John Hellstrom Author

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Funding Acknowledgements

This analyses is inserted within the project "Clima ed eventi alluvionali estremi in Versilia: integrazione di nuove tecniche geoarcheologiche, geomorfologiche, geochimiche e simulazioni numeriche (Leader M. Bini)" (Funded by "Fondazione Cassa di Risparmio di Lucca Call 2016"), The codes used in this work are implemented in Matlab (R) (University of Pisa Campus Licence). The authors thanks B. Giaccio and another anonymous reviewer for their comments, which help to improve the quality of the manuscript.