Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles
Ice core records from Greenland evidence abrupt warming event recurring at millennial time scales during previous glacial intervals. Although transitions strongly resembling these Dansgaard-Oeschger (DO) transitions have been revealed in several speleothem records, our understanding of the climate a...
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ftunivparmairis:oai:air.unipr.it:11381/2901522 2024-02-27T08:41:06+00:00 Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles Jens Fohlmeister Natasha Sekhon Andrea Columbu Kira Rehfeld Louise Sime Cristina Veige-Pires Norbert Marwan Niklas Boers Fohlmeister, Jen Sekhon, Natasha Columbu, Andrea Rehfeld, Kira Sime, Louise Veige-Pires, Cristina Marwan, Norbert Boers, Niklas 2021 ELETTRONICO http://hdl.handle.net/11381/2901522 eng eng ispartofbook:Session: Tipping Points in the Earth System EGU General Assembly 2021 firstpage:1 lastpage:1 numberofpages:1 http://hdl.handle.net/11381/2901522 palaeoclimate DO cycle climate model speleothems info:eu-repo/semantics/conferenceObject 2021 ftunivparmairis 2024-01-31T17:45:46Z Ice core records from Greenland evidence abrupt warming event recurring at millennial time scales during previous glacial intervals. Although transitions strongly resembling these Dansgaard-Oeschger (DO) transitions have been revealed in several speleothem records, our understanding of the climate and ecosystem impacts of the Greenland warming events in lower latitudes remains incomplete. Here, we investigate the influence of these transitions on the global atmospheric circulation pattern. We comprehensively analyse d18O changes during DO transitions in a globally distributed dataset of speleothems. The speleothem d18O signals mostly represent changes in precipitation amounts and moisture source, and thereby allows us to infer spatially resolved changes in global atmospheric dynamics that are characteristically linked to the DO transitions. In addition to the previously proposed shift of the Intertropical Convergence Zone towards more northerly positions, we find evidence for a similar northward shift of the westerly winds of the northern Hemisphere. Furthermore, we reveal a decreasing trend of the transition amplitudes with increasing distance from the North Atlantic region, justifying earlier assumptions of this region being the core and origin of these past abrupt climate changes. Conference Object Greenland ice core North Atlantic Archivio della ricerca dell'Università di Parma (CINECA IRIS) Greenland |
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Open Polar |
collection |
Archivio della ricerca dell'Università di Parma (CINECA IRIS) |
op_collection_id |
ftunivparmairis |
language |
English |
topic |
palaeoclimate DO cycle climate model speleothems |
spellingShingle |
palaeoclimate DO cycle climate model speleothems Jens Fohlmeister Natasha Sekhon Andrea Columbu Kira Rehfeld Louise Sime Cristina Veige-Pires Norbert Marwan Niklas Boers Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
topic_facet |
palaeoclimate DO cycle climate model speleothems |
description |
Ice core records from Greenland evidence abrupt warming event recurring at millennial time scales during previous glacial intervals. Although transitions strongly resembling these Dansgaard-Oeschger (DO) transitions have been revealed in several speleothem records, our understanding of the climate and ecosystem impacts of the Greenland warming events in lower latitudes remains incomplete. Here, we investigate the influence of these transitions on the global atmospheric circulation pattern. We comprehensively analyse d18O changes during DO transitions in a globally distributed dataset of speleothems. The speleothem d18O signals mostly represent changes in precipitation amounts and moisture source, and thereby allows us to infer spatially resolved changes in global atmospheric dynamics that are characteristically linked to the DO transitions. In addition to the previously proposed shift of the Intertropical Convergence Zone towards more northerly positions, we find evidence for a similar northward shift of the westerly winds of the northern Hemisphere. Furthermore, we reveal a decreasing trend of the transition amplitudes with increasing distance from the North Atlantic region, justifying earlier assumptions of this region being the core and origin of these past abrupt climate changes. |
author2 |
Fohlmeister, Jen Sekhon, Natasha Columbu, Andrea Rehfeld, Kira Sime, Louise Veige-Pires, Cristina Marwan, Norbert Boers, Niklas |
format |
Conference Object |
author |
Jens Fohlmeister Natasha Sekhon Andrea Columbu Kira Rehfeld Louise Sime Cristina Veige-Pires Norbert Marwan Niklas Boers |
author_facet |
Jens Fohlmeister Natasha Sekhon Andrea Columbu Kira Rehfeld Louise Sime Cristina Veige-Pires Norbert Marwan Niklas Boers |
author_sort |
Jens Fohlmeister |
title |
Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
title_short |
Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
title_full |
Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
title_fullStr |
Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
title_full_unstemmed |
Global reorganization of atmospheric circulation during Dansgaard-Oschger cycles |
title_sort |
global reorganization of atmospheric circulation during dansgaard-oschger cycles |
publishDate |
2021 |
url |
http://hdl.handle.net/11381/2901522 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core North Atlantic |
genre_facet |
Greenland ice core North Atlantic |
op_relation |
ispartofbook:Session: Tipping Points in the Earth System EGU General Assembly 2021 firstpage:1 lastpage:1 numberofpages:1 http://hdl.handle.net/11381/2901522 |
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1792048358339117056 |