North Atlantic Versus Global Control on Dansgaard‐Oeschger Events.

Dima, M., Lohmann, G. and Knorr, G. (2018) North Atlantic Versus Global Control on Dansgaard‐Oeschger Events. Geophysical Research Letters, 45 (23). 12.991-12.998. DOI 10.1029/2018GL080035.

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Abstract

The classic scenario for the generation of Dansgaard‐Oeschger (DO) events assumes a link to changes in the Atlantic Meridional Overturning Circulation (AMOC) induced by North Atlantic freshwater perturbations. Recent proxy data emphasize the existence of leads and lags between DO fingerprints in Greenland and Antarctic records, highlighting the potential of a Southern Hemisphere control on these events. Investigating this possibility, we provide a conceptual model resulting from phase space reconstructions based on the northern and southern ice core records. The resulting patterns closely resemble AMOC hysteresis, consistent with a northern abrupt warming linked to gradual global temperature changes. This suggests that rapid DO warmings associated with abrupt AMOC transitions from a relatively weak (cold stadial) state to a stronger (warm interstadial) state can be controlled by global forcing that can be linked to the Southern Hemisphere, rather than by the end of a local temporary forcing in the North Atlantic.

Document Type: Article
Keywords: Dansgaard‐Oeschger events; thermohaline circulation; hysteresis diagram; global forcing; Southern Hemisphere
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2018GL080035
ISSN: 0094-8276
Projects: PalMod
Date Deposited: 23 Mar 2020 13:06
Last Modified: 23 Mar 2020 13:06
URI: http://oceanrep.geomar.de/id/eprint/49293

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