Articles | Volume 14, issue 7
https://doi.org/10.5194/cp-14-969-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-14-969-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
04 Jul 2018
Research article |
| 04 Jul 2018
| 04 Jul 2018
Evaluating the link between the sulfur-rich Laacher See volcanic eruption and the Younger Dryas climate anomaly
James U. L. Baldini
CORRESPONDING AUTHOR
Department of Earth Sciences, University of Durham, Durham, DH1 3LE,
UK
Richard J. Brown
Department of Earth Sciences, University of Durham, Durham, DH1 3LE,
UK
Natasha Mawdsley
Department of Earth Sciences, University of Durham, Durham, DH1 3LE,
UK
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During at least two phases in its past, Earth was more or less covered in ice. These “snowball Earth” events probably started suddenly upon undercutting a certain threshold in the carbon-dioxide concentration. This threshold can vary considerably under different conditions. In our study, we find the thresholds for different distributions of continents, geometries of Earth’s orbit, and volcanic eruptions. The results show that the threshold might have varied by up to 46 %.
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Short summary
The Younger Dryas occurred ~13 ka BP and is an iconic millennial-scale climate anomaly. However, the cause of the event is still ambiguous. Here, we propose that the event was triggered by a large, sulfur-rich eruption of the Laacher See volcano (Germany). The eruption's direct (sulfate aerosol-induced) cooling effects lasted less than 5 years, and we suggest these were amplified and extended by a sea-ice–ocean circulation positive feedback, leading to the event's characteristic features.
The Younger Dryas occurred ~13 ka BP and is an iconic millennial-scale climate anomaly. However,...
