Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation
<jats:p>Abstract. 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...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/285677 2024-01-14T10:02:14+01:00 Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation Landais, A Capron, E Toucanne, S Rhodes, R Popp, T Vinther, B Minster, B Prié, F 2018 application/pdf https://www.repository.cam.ac.uk/handle/1810/285677 https://doi.org/10.17863/CAM.33029 eng eng Copernicus GmbH http://dx.doi.org/10.5194/cp-14-1405-2018 Climate of the Past https://www.repository.cam.ac.uk/handle/1810/285677 doi:10.17863/CAM.33029 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action Article 2018 ftunivcam https://doi.org/10.17863/CAM.33029 2023-12-21T23:29:15Z <jats:p>Abstract. 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 14.7 ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼16.2 ka, 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. </jats:p> Rachael H. Rhodes received funding from a European Commission Horizon 2020 Marie Skłodowska-Curie Individual Fellowship (no. 658120, SEADOG). Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic Apollo - University of Cambridge Repository Antarctic Greenland |
institution |
Open Polar |
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Apollo - University of Cambridge Repository |
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ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action Landais, A Capron, E Toucanne, S Rhodes, R Popp, T Vinther, B Minster, B Prié, F Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action |
description |
<jats:p>Abstract. 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 14.7 ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼16.2 ka, 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. </jats:p> Rachael H. Rhodes received funding from a European Commission Horizon 2020 Marie Skłodowska-Curie Individual Fellowship (no. 658120, SEADOG). |
format |
Article in Journal/Newspaper |
author |
Landais, A Capron, E Toucanne, S Rhodes, R Popp, T Vinther, B Minster, B Prié, F |
author_facet |
Landais, A Capron, E Toucanne, S Rhodes, R Popp, T Vinther, B Minster, B Prié, F |
author_sort |
Landais, A |
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 |
Copernicus GmbH |
publishDate |
2018 |
url |
https://www.repository.cam.ac.uk/handle/1810/285677 https://doi.org/10.17863/CAM.33029 |
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://www.repository.cam.ac.uk/handle/1810/285677 doi:10.17863/CAM.33029 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.33029 |
_version_ |
1788057162701864960 |