Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation
The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interpl...
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European Geosciences Union
2018
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/37597/ https://doi.org/10.5194/cp-14-1405-2018 https://nrl.northumbria.ac.uk/id/eprint/37597/1/cp-14-1405-2018.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:37597 2023-05-15T13:56:54+02:00 Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael H. Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric 2018-10-08 text https://nrl.northumbria.ac.uk/id/eprint/37597/ https://doi.org/10.5194/cp-14-1405-2018 https://nrl.northumbria.ac.uk/id/eprint/37597/1/cp-14-1405-2018.pdf en eng European Geosciences Union https://nrl.northumbria.ac.uk/id/eprint/37597/1/cp-14-1405-2018.pdf Landais, Amaëlle, Capron, Emilie, Masson-Delmotte, Valérie, Toucanne, Samuel, Rhodes, Rachael H., Popp, Trevor, Vinther, Bo, Minster, Bénédicte and Prié, Frédéric (2018) Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation. Climate of the Past, 14 (10). pp. 1405-1415. ISSN 1814-9332 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2018 ftunivnorthumb https://doi.org/10.5194/cp-14-1405-2018 2022-09-25T06:08:59Z The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital- and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high- and low- latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different regions of the Northern Hemisphere. Here, we combine new ice d-excess and 17O-excess records, tracing changes in the midlatitudes, with ice δ18O records of polar climate. Within Heinrich Stadial 1, we demonstrate a decoupling between climatic conditions in Greenland and those of the lower latitudes. While Greenland temperature remains mostly stable from 17.5 to 14.7ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼ 16.2ka, associated with warmer and wetter conditions of Greenland moisture sources. We show that this climate modification is coincident with abrupt changes in atmospheric CO2 and CH4 concentrations recorded in an Antarctic ice core. Our coherent ice core chronological framework and comparison with other paleoclimate records suggests a mechanism involving two-step freshwater fluxes in the North Atlantic associated with a southward shift of the Intertropical Convergence Zone. Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic Northumbria University, Newcastle: Northumbria Research Link (NRL) Antarctic Greenland Climate of the Past 14 10 1405 1415 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael H. Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital- and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high- and low- latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different regions of the Northern Hemisphere. Here, we combine new ice d-excess and 17O-excess records, tracing changes in the midlatitudes, with ice δ18O records of polar climate. Within Heinrich Stadial 1, we demonstrate a decoupling between climatic conditions in Greenland and those of the lower latitudes. While Greenland temperature remains mostly stable from 17.5 to 14.7ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼ 16.2ka, associated with warmer and wetter conditions of Greenland moisture sources. We show that this climate modification is coincident with abrupt changes in atmospheric CO2 and CH4 concentrations recorded in an Antarctic ice core. Our coherent ice core chronological framework and comparison with other paleoclimate records suggests a mechanism involving two-step freshwater fluxes in the North Atlantic associated with a southward shift of the Intertropical Convergence Zone. |
format |
Article in Journal/Newspaper |
author |
Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael H. Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric |
author_facet |
Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael H. Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric |
author_sort |
Landais, Amaëlle |
title |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_short |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_full |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_fullStr |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_full_unstemmed |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_sort |
ice core evidence for decoupling between midlatitude atmospheric water cycle and greenland temperature during the last deglaciation |
publisher |
European Geosciences Union |
publishDate |
2018 |
url |
https://nrl.northumbria.ac.uk/id/eprint/37597/ https://doi.org/10.5194/cp-14-1405-2018 https://nrl.northumbria.ac.uk/id/eprint/37597/1/cp-14-1405-2018.pdf |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/37597/1/cp-14-1405-2018.pdf Landais, Amaëlle, Capron, Emilie, Masson-Delmotte, Valérie, Toucanne, Samuel, Rhodes, Rachael H., Popp, Trevor, Vinther, Bo, Minster, Bénédicte and Prié, Frédéric (2018) Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation. Climate of the Past, 14 (10). pp. 1405-1415. ISSN 1814-9332 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-14-1405-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
10 |
container_start_page |
1405 |
op_container_end_page |
1415 |
_version_ |
1766264502229139456 |