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Publication . Article . Other literature type . 2017

Exploring the oxygen isotope fingerprint of Dansgaard-Oeschger variability and Heinrich events

Witold Bagniewski; Katrin J. Meissner; Laurie Menviel;
Open Access
Published: 01 Mar 2017 Journal: Quaternary Science Reviews, volume 159, pages 1-14 (issn: 0277-3791, Copyright policy )
Publisher: Elsevier BV
Country: France
Abstract

Abstract We present the first transient simulations of Marine Isotope Stage 3 (MIS 3) performed with an oxygen isotope-enabled climate model. Our simulations span several Dansgaard-Oeschger cycles and three Heinrich stadials and are directly compared with oxygen isotope records from 13 sediment and 2 ice cores. Our results are consistent with a 30–50% weakening of the Atlantic Meridional Overturning Circulation during Dansgaard-Oeschger stadials and a complete shutdown during Heinrich stadials. We find that the simulated δ 18 O anomalies differ significantly between Heinrich stadials and non-Heinrich stadials. This difference is mainly due to different responses in ocean circulation, and therefore climate, impacting oceanic δ 18 O, while the volume of 18 O-depleted meltwater plays a secondary role.

Subjects by Vocabulary

Microsoft Academic Graph classification: Isotopes of oxygen Marine isotope stage Oceanography Ice core Sediment Geology Ocean current Climate model Stadial Meltwater

Subjects

Global and Planetary Change, Geology, Ecology, Evolution, Behavior and Systematics, Archeology, MIS3, Model-data comparison, Heinrich events, Dansgaard-Oeschger cycles, delta O-18, AMOC

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