Was millennial scale climate change during the Last Glacial triggered by explosive volcanism?
The mechanisms responsible for millennial scale climate change within glacial time intervals are equivocal. Here we show that all eight known radiometrically-dated Tambora-sized or larger NH eruptions over the interval 30 to 80 ka BP are associated with abrupt Greenland cooling (>95% confidence)....
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:20062 2023-05-15T14:02:14+02:00 Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? Baldini, J.U.L. Brown, R.J. McElwaine, J.N. 2015-11-30 application/pdf http://dro.dur.ac.uk/20062/ http://dro.dur.ac.uk/20062/1/20062.pdf https://doi.org/10.1038/srep17442 unknown Nature Publishing Group dro:20062 issn:2045-2322 doi:10.1038/srep17442 http://dro.dur.ac.uk/20062/ https://doi.org/10.1038/srep17442 http://dro.dur.ac.uk/20062/1/20062.pdf This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Scientific reports, 2015, Vol.5, pp.17442 [Peer Reviewed Journal] Article PeerReviewed 2015 ftunivdurham https://doi.org/10.1038/srep17442 2020-05-28T22:36:01Z The mechanisms responsible for millennial scale climate change within glacial time intervals are equivocal. Here we show that all eight known radiometrically-dated Tambora-sized or larger NH eruptions over the interval 30 to 80 ka BP are associated with abrupt Greenland cooling (>95% confidence). Additionally, previous research reported a strong statistical correlation between the timing of Southern Hemisphere volcanism and Dansgaard-Oeschger (DO) events (>99% confidence), but did not identify a causative mechanism. Volcanic aerosol-induced asymmetrical hemispheric cooling over the last few hundred years restructured atmospheric circulation in a similar fashion as that associated with Last Glacial millennial-scale shifts (albeit on a smaller scale). We hypothesise that following both recent and Last Glacial NH eruptions, volcanogenic sulphate injections into the stratosphere cooled the NH preferentially, inducing a hemispheric temperature asymmetry that shifted atmospheric circulation cells southward. This resulted in Greenland cooling, Antarctic warming, and a southward shifted ITCZ. However, during the Last Glacial, the initial eruption-induced climate response was prolonged by NH glacier and sea ice expansion, increased NH albedo, AMOC weakening, more NH cooling, and a consequent positive feedback. Conversely, preferential SH cooling following large SH eruptions shifted atmospheric circulation to the north, resulting in the characteristic features of DO events. Article in Journal/Newspaper Antarc* Antarctic glacier Greenland Sea ice Durham University: Durham Research Online Antarctic Greenland Scientific Reports 5 1 |
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Durham University: Durham Research Online |
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ftunivdurham |
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The mechanisms responsible for millennial scale climate change within glacial time intervals are equivocal. Here we show that all eight known radiometrically-dated Tambora-sized or larger NH eruptions over the interval 30 to 80 ka BP are associated with abrupt Greenland cooling (>95% confidence). Additionally, previous research reported a strong statistical correlation between the timing of Southern Hemisphere volcanism and Dansgaard-Oeschger (DO) events (>99% confidence), but did not identify a causative mechanism. Volcanic aerosol-induced asymmetrical hemispheric cooling over the last few hundred years restructured atmospheric circulation in a similar fashion as that associated with Last Glacial millennial-scale shifts (albeit on a smaller scale). We hypothesise that following both recent and Last Glacial NH eruptions, volcanogenic sulphate injections into the stratosphere cooled the NH preferentially, inducing a hemispheric temperature asymmetry that shifted atmospheric circulation cells southward. This resulted in Greenland cooling, Antarctic warming, and a southward shifted ITCZ. However, during the Last Glacial, the initial eruption-induced climate response was prolonged by NH glacier and sea ice expansion, increased NH albedo, AMOC weakening, more NH cooling, and a consequent positive feedback. Conversely, preferential SH cooling following large SH eruptions shifted atmospheric circulation to the north, resulting in the characteristic features of DO events. |
format |
Article in Journal/Newspaper |
author |
Baldini, J.U.L. Brown, R.J. McElwaine, J.N. |
spellingShingle |
Baldini, J.U.L. Brown, R.J. McElwaine, J.N. Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
author_facet |
Baldini, J.U.L. Brown, R.J. McElwaine, J.N. |
author_sort |
Baldini, J.U.L. |
title |
Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
title_short |
Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
title_full |
Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
title_fullStr |
Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
title_full_unstemmed |
Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? |
title_sort |
was millennial scale climate change during the last glacial triggered by explosive volcanism? |
publisher |
Nature Publishing Group |
publishDate |
2015 |
url |
http://dro.dur.ac.uk/20062/ http://dro.dur.ac.uk/20062/1/20062.pdf https://doi.org/10.1038/srep17442 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic glacier Greenland Sea ice |
genre_facet |
Antarc* Antarctic glacier Greenland Sea ice |
op_source |
Scientific reports, 2015, Vol.5, pp.17442 [Peer Reviewed Journal] |
op_relation |
dro:20062 issn:2045-2322 doi:10.1038/srep17442 http://dro.dur.ac.uk/20062/ https://doi.org/10.1038/srep17442 http://dro.dur.ac.uk/20062/1/20062.pdf |
op_rights |
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/srep17442 |
container_title |
Scientific Reports |
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5 |
container_issue |
1 |
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