Duration and dynamics of the best orbital analogue to the present interglacial
Biagio Giaccio, Eleonora Regattieri, Giovanni Zanchetta, Sebastien Nomade, Paul R Renne, Courtney J Sprain, Russell N Drysdale, Polychronis C Tzedakis, Paolo Messina, Giancarlo Scardia, Andrea Sposato, Franck Bassinot
Geology | GEOLOGICAL SOC AMER, INC | Published : 2015
Past orbital analogues to the current interglacial, such as Marine Isotope Stage 19c (MIS 19c, ca. 800 ka), can provide reliable reference intervals for evaluating the timing and the duration of the Holocene and factors inherent in its climatic progression. Here we present the first high-resolution paleoclimatic record for MIS 19 anchored to a high-precision 40Ar/39Ar chronology, thus fully independent of any a priori assumptions on the orbital mechanisms underlying the climatic changes. It is based on the oxygen isotope compositions of Italian lake sediments showing orbital- to millennial-scale hydrological variability over the Mediterranean between 810 and 750 ka. Our record indicates that..View full abstract
Awarded by Natural Environment Research Council
We thank Valerie Masson-Delmotte for her critical review of an early manuscript. We also benefited from insightful comments from Bill Ruddiman and five anonymous reviewers. Regattieri is supported by a Ph.D. grant from the School of Graduate Studies Galileo Galilei (University of Pisa, Italy). The <SUP>40</SUP>Ar/<SUP>39</SUP>Ar ages were supported by the Ann and Gordon Getty Foundation (Berkeley Geochronology Center), and by a SYSTER 2013 program from the National Institute for Earth Sciences and Astronomy (CNRS-INSU) to Nomade. Tzedakis acknowledges funding from the Natural Environment Research Council (grant NE/I025115/1). Giaccio thanks La Locanda di Gino in Sulmona, Italy, for valuable help in the field.