Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events
During the last glacial period Northern Hemisphere climate was characterized by extreme and abrupt climate changes, so-called Dansgaard–Oeschger (DO) events. Most clearly observed as temperature changes in Greenland ice-core records, their climatic imprint was geographically widespread. However, the...
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ftdoajarticles:oai:doaj.org/article:5db02ba9333f46d1999414da32e853d3 2023-05-15T16:00:04+02:00 Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events F. Adolphi C. Bronk Ramsey T. Erhardt R. L. Edwards H. Cheng C. S. M. Turney A. Cooper A. Svensson S. O. Rasmussen H. Fischer R. Muscheler 2018-11-01T00:00:00Z https://doi.org/10.5194/cp-14-1755-2018 https://doaj.org/article/5db02ba9333f46d1999414da32e853d3 EN eng Copernicus Publications https://www.clim-past.net/14/1755/2018/cp-14-1755-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-1755-2018 1814-9324 1814-9332 https://doaj.org/article/5db02ba9333f46d1999414da32e853d3 Climate of the Past, Vol 14, Pp 1755-1781 (2018) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2018 ftdoajarticles https://doi.org/10.5194/cp-14-1755-2018 2022-12-31T16:22:20Z During the last glacial period Northern Hemisphere climate was characterized by extreme and abrupt climate changes, so-called Dansgaard–Oeschger (DO) events. Most clearly observed as temperature changes in Greenland ice-core records, their climatic imprint was geographically widespread. However, the temporal relation between DO events in Greenland and other regions is uncertain due to the chronological uncertainties of each archive, limiting our ability to test hypotheses of synchronous change. In contrast, the assumption of direct synchrony of climate changes forms the basis of many timescales. Here, we use cosmogenic radionuclides ( 10 Be , 36 Cl , 14 C ) to link Greenland ice-core records to U∕Th -dated speleothems, quantify offsets between the two timescales, and improve their absolute dating back to 45 000 years ago. This approach allows us to test the assumption that DO events occurred synchronously between Greenland ice-core and tropical speleothem records with unprecedented precision. We find that the onset of DO events occurs within synchronization uncertainties in all investigated records. Importantly, we demonstrate that local discrepancies remain in the temporal development of rapid climate change for specific events and speleothems. These may either be related to the location of proxy records relative to the shifting atmospheric fronts or to underestimated U∕Th dating uncertainties. Our study thus highlights the potential for misleading interpretations of the Earth system when applying the common practice of climate wiggle matching. Article in Journal/Newspaper Dansgaard-Oeschger events Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Greenland Climate of the Past 14 11 1755 1781 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 F. Adolphi C. Bronk Ramsey T. Erhardt R. L. Edwards H. Cheng C. S. M. Turney A. Cooper A. Svensson S. O. Rasmussen H. Fischer R. Muscheler Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
During the last glacial period Northern Hemisphere climate was characterized by extreme and abrupt climate changes, so-called Dansgaard–Oeschger (DO) events. Most clearly observed as temperature changes in Greenland ice-core records, their climatic imprint was geographically widespread. However, the temporal relation between DO events in Greenland and other regions is uncertain due to the chronological uncertainties of each archive, limiting our ability to test hypotheses of synchronous change. In contrast, the assumption of direct synchrony of climate changes forms the basis of many timescales. Here, we use cosmogenic radionuclides ( 10 Be , 36 Cl , 14 C ) to link Greenland ice-core records to U∕Th -dated speleothems, quantify offsets between the two timescales, and improve their absolute dating back to 45 000 years ago. This approach allows us to test the assumption that DO events occurred synchronously between Greenland ice-core and tropical speleothem records with unprecedented precision. We find that the onset of DO events occurs within synchronization uncertainties in all investigated records. Importantly, we demonstrate that local discrepancies remain in the temporal development of rapid climate change for specific events and speleothems. These may either be related to the location of proxy records relative to the shifting atmospheric fronts or to underestimated U∕Th dating uncertainties. Our study thus highlights the potential for misleading interpretations of the Earth system when applying the common practice of climate wiggle matching. |
format |
Article in Journal/Newspaper |
author |
F. Adolphi C. Bronk Ramsey T. Erhardt R. L. Edwards H. Cheng C. S. M. Turney A. Cooper A. Svensson S. O. Rasmussen H. Fischer R. Muscheler |
author_facet |
F. Adolphi C. Bronk Ramsey T. Erhardt R. L. Edwards H. Cheng C. S. M. Turney A. Cooper A. Svensson S. O. Rasmussen H. Fischer R. Muscheler |
author_sort |
F. Adolphi |
title |
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
title_short |
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
title_full |
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
title_fullStr |
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
title_full_unstemmed |
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events |
title_sort |
connecting the greenland ice-core and u∕th timescales via cosmogenic radionuclides: testing the synchroneity of dansgaard–oeschger events |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-1755-2018 https://doaj.org/article/5db02ba9333f46d1999414da32e853d3 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dansgaard-Oeschger events Greenland Greenland ice core ice core |
genre_facet |
Dansgaard-Oeschger events Greenland Greenland ice core ice core |
op_source |
Climate of the Past, Vol 14, Pp 1755-1781 (2018) |
op_relation |
https://www.clim-past.net/14/1755/2018/cp-14-1755-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-1755-2018 1814-9324 1814-9332 https://doaj.org/article/5db02ba9333f46d1999414da32e853d3 |
op_doi |
https://doi.org/10.5194/cp-14-1755-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
11 |
container_start_page |
1755 |
op_container_end_page |
1781 |
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1766395938239152128 |