On the Role of Volcanism in Dansgaard-Oeschger Cycles
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...
Main Authors: | , |
---|---|
Format: | Text |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-2020-160 https://cp.copernicus.org/preprints/cp-2020-160/ |
id |
ftcopernicus:oai:publications.copernicus.org:cpd91728 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:cpd91728 2023-05-15T13:31:39+02:00 On the Role of Volcanism in Dansgaard-Oeschger Cycles Lohmann, Johannes Svensson, Anders 2020-12-23 application/pdf https://doi.org/10.5194/cp-2020-160 https://cp.copernicus.org/preprints/cp-2020-160/ eng eng doi:10.5194/cp-2020-160 https://cp.copernicus.org/preprints/cp-2020-160/ eISSN: 1814-9332 Text 2020 ftcopernicus https://doi.org/10.5194/cp-2020-160 2020-12-28T17:22:12Z 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. Text Antarc* Antarctic Dansgaard-Oeschger events Greenland Copernicus Publications: E-Journals Antarctic Greenland |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Lohmann, Johannes Svensson, Anders |
spellingShingle |
Lohmann, Johannes Svensson, Anders On the Role of Volcanism in Dansgaard-Oeschger Cycles |
author_facet |
Lohmann, Johannes Svensson, Anders |
author_sort |
Lohmann, Johannes |
title |
On the Role of Volcanism in Dansgaard-Oeschger Cycles |
title_short |
On the Role of Volcanism in Dansgaard-Oeschger Cycles |
title_full |
On the Role of Volcanism in Dansgaard-Oeschger Cycles |
title_fullStr |
On the Role of Volcanism in Dansgaard-Oeschger Cycles |
title_full_unstemmed |
On the Role of Volcanism in Dansgaard-Oeschger Cycles |
title_sort |
on the role of volcanism in dansgaard-oeschger cycles |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-2020-160 https://cp.copernicus.org/preprints/cp-2020-160/ |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Dansgaard-Oeschger events Greenland |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events Greenland |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-2020-160 https://cp.copernicus.org/preprints/cp-2020-160/ |
op_doi |
https://doi.org/10.5194/cp-2020-160 |
_version_ |
1766019916922617856 |