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

Type Article
Date 2017-03
Language English
Author(s) Bagniewski Witold1, 2, Meissner Katrin J.1, 2, Menviel Laurie1, 2, 3
Affiliation(s) 1 : Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia.
2 : ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia.
3 : Univ New South Wales, PANGEA Res Ctr, Sydney, NSW, Australia.
Source Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-03 , Vol. 159 , P. 1-14
DOI 10.1016/j.quascirev.2017.01.007
WOS© Times Cited 12
Keyword(s) MIS3, Model-data comparison, Heinrich events, Dansgaard-Oeschger cycles, delta O-18, AMOC
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 delta O-18 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 delta O-18, while the volume of O-18-depleted meltwater plays a secondary role.

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