Multiple causes of the Younger Dryas cold period
Renssen, Hans; Mairesse, Aurélien; Goosse, Hugues; Mathiot, Pierre; Heiri, Oliver; Roche, Didier M.; Nisancioglu, Kerim H.; Valdes, Paul J.. 2015 Multiple causes of the Younger Dryas cold period. Nature Geoscience, 8 (12). 946-949. 10.1038/ngeo2557
Full text not available from this repository. (Request a copy)Abstract/Summary
The Younger Dryas cooling event disrupted the overall warming trend in the North Atlantic region during the last deglaciation1, 2, 3, 4, 5, 6. Climate change during the Younger Dryas was abrupt7, 8, 9, and thus provides insights into the sensitivity of the climate system to perturbations. The sudden Younger Dryas cooling has traditionally been attributed to a shutdown of the Atlantic Meridional Overturning Circulation by meltwater discharges10, 11, 12, 13. However, alternative explanations such as strong negative radiative forcing14 and a shift in atmospheric circulation15 have also been offered. Here we investigate the importance of these different forcings in coupled climate model experiments constrained by data assimilation. We find that the Younger Dryas climate signal as registered in proxy evidence is best simulated using a combination of processes: a weakened Atlantic Meridional Overturning Circulation, moderate negative radiative forcing and an altered atmospheric circulation. We conclude that none of the individual mechanisms alone provide a plausible explanation for the Younger Dryas cold period. We suggest that the triggers for abrupt climate changes such as the Younger Dryas are more complex than suggested so far, and that studies on the response of the climate system to perturbations should account for this complexity.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1038/ngeo2557 |
Programmes: | BAS Programmes > BAS Programmes 2015 > Polar Oceans |
ISSN: | 1752-0894 |
Date made live: | 25 Jan 2016 13:29 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/512697 |
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