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- Title
On the Role of Volcanism in Dansgaard-Oeschger Cycles.
- Authors
Lohmann, Johannes; Svensson, Anders
- Abstract
A significant influence of major volcanic eruptions on regime shifts and long-term climate variability has been suggested previously. But a statistical assessment of this has been hampered by inaccurate synchronization of large volcanic eruptions to changes in past climate. Here, this is achieved by combining a new record of bipolar volcanism from Greenland and Antarctic ice cores with records of abrupt climate change derived from the same ice cores. We show that at > 99 % confidence bipolar volcanic eruptions occurred more frequently than expected by chance just before the onset of Dansgaard-Oeschger events, the most prominent large-scale abrupt climate changes of the last glacial period. Out of 20 climate change events in the 12-60 ka period, 5 (7) occur within 20 (50) years after a bipolar eruption. Thus, such large eruptions may act as short-term triggers for large-scale abrupt climate change, and may explain part of the variability of Dansgaard-Oeschger cycles.
- Subjects
GREENLAND; VOLCANISM; ICE cores; CLIMATE change; GLACIATION; GREENLAND ice; VOLCANIC eruptions
- Publication
Climate of the Past Discussions, 2020, p1
- ISSN
1814-9324
- Publication type
Article
- DOI
10.5194/cp-2020-160