Skip to Main Content
Skip Nav Destination
GEOREF RECORD

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 and Franck Bassinot
Duration and dynamics of the best orbital analogue to the present interglacial
Geology (Boulder) (July 2015) 43 (7): 603-606

Abstract

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 (super 40) Ar/ (super 39) Ar 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 the MIS 19c interglacial lasted 10.8 + or - 3.7 k.y., comparable to the time elapsed since the onset of the Holocene, and that the orbital configuration at the time of the following glacial inception was very similar to the present one. By analogy, the current interglacial should be close to its end. However, greenhouse gas concentrations at the time of the MIS 19 glacial inception were significantly lower than those of the late Holocene, suggesting that the current interglacial could have already been prolonged by the progressive increase of the greenhouse gases since 8-6 ka, possibly due to early anthropogenic disturbance of vegetation.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 7
Title: Duration and dynamics of the best orbital analogue to the present interglacial
Affiliation: Istituto di Geologia Ambientale e Geoingegneria, Rome, Italy
Pages: 603-606
Published: 201507
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2015-093511
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2015209
Illustration Description: illus. incl. sketch map
Secondary Affiliation: Laboratoire des Sciences du Climat et de l'Environnement, FRA, FranceBerkeley Geochronology Center, USA, United StatesUniversity of Melbourne, AUS, AustraliaUniversity College London, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201540
Close Modal

or Create an Account

Close Modal
Close Modal