Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion
This study presents the first continuously measured transfer functions that quantify the age difference between the Greenland ice-core chronology 2005 (GICC05) and the U–Th timescale during the last glacial period. The transfer functions were estimated using an automated algorithm for Bayesian inver...
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ftdoajarticles:oai:doaj.org/article:1cb49e162bce4d26a0532c6f3fa0f712 2024-09-15T18:08:47+00:00 Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion F. Muschitiello M. A. Aquino-Lopez 2024-06-01T00:00:00Z https://doi.org/10.5194/cp-20-1415-2024 https://doaj.org/article/1cb49e162bce4d26a0532c6f3fa0f712 EN eng Copernicus Publications https://cp.copernicus.org/articles/20/1415/2024/cp-20-1415-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-1415-2024 1814-9324 1814-9332 https://doaj.org/article/1cb49e162bce4d26a0532c6f3fa0f712 Climate of the Past, Vol 20, Pp 1415-1435 (2024) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.5194/cp-20-1415-2024 2024-08-05T17:49:04Z This study presents the first continuously measured transfer functions that quantify the age difference between the Greenland ice-core chronology 2005 (GICC05) and the U–Th timescale during the last glacial period. The transfer functions were estimated using an automated algorithm for Bayesian inversion that allows inferring a continuous and objective synchronization between Greenland ice-core and East Asian summer monsoon speleothem data, and a total of three transfer functions were inferred using independent ice-core records. The algorithm is based on an alignment model that considers prior knowledge of the GICC05 counting error but also samples synchronization scenarios that exceed the differential dating uncertainty of the annual-layer count in ice cores, which are currently hard to detect using conventional alignment techniques. The transfer functions are on average 48 % more precise than previous estimates and significantly reduce the absolute dating uncertainty of the GICC05 back to 48 kyr ago. The results reveal that GICCC05 is, on average, systematically younger than the U–Th timescale by 0.86 %. However, they also highlight that the annual-layer counting error is not strictly correlated over extended periods of time and that within the coldest Greenland Stadials the differential dating uncertainty is likely underestimated by up to ∼13 %. Importantly, the analysis implies for the first time that during the Last Glacial Maximum GICC05 may overcount ice layers by ∼10 % – a bias possibly attributable to a higher frequency of sub-annual layers due to changes in the seasonal cycle of precipitation and mode of dust deposition to the Greenland Ice Sheet. The new timescale transfer functions provide important constraints on the uncertainty surrounding the stratigraphic dating of the Greenland age scale and enable an improved chronological integration of ice cores as well as U–Th-dated and radiocarbon-dated paleoclimate records on a common timeline. The transfer functions are available as a Supplement to this ... Article in Journal/Newspaper Greenland Greenland ice core ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Climate of the Past 20 6 1415 1435 |
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Directory of Open Access Journals: DOAJ Articles |
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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. Muschitiello M. A. Aquino-Lopez Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
This study presents the first continuously measured transfer functions that quantify the age difference between the Greenland ice-core chronology 2005 (GICC05) and the U–Th timescale during the last glacial period. The transfer functions were estimated using an automated algorithm for Bayesian inversion that allows inferring a continuous and objective synchronization between Greenland ice-core and East Asian summer monsoon speleothem data, and a total of three transfer functions were inferred using independent ice-core records. The algorithm is based on an alignment model that considers prior knowledge of the GICC05 counting error but also samples synchronization scenarios that exceed the differential dating uncertainty of the annual-layer count in ice cores, which are currently hard to detect using conventional alignment techniques. The transfer functions are on average 48 % more precise than previous estimates and significantly reduce the absolute dating uncertainty of the GICC05 back to 48 kyr ago. The results reveal that GICCC05 is, on average, systematically younger than the U–Th timescale by 0.86 %. However, they also highlight that the annual-layer counting error is not strictly correlated over extended periods of time and that within the coldest Greenland Stadials the differential dating uncertainty is likely underestimated by up to ∼13 %. Importantly, the analysis implies for the first time that during the Last Glacial Maximum GICC05 may overcount ice layers by ∼10 % – a bias possibly attributable to a higher frequency of sub-annual layers due to changes in the seasonal cycle of precipitation and mode of dust deposition to the Greenland Ice Sheet. The new timescale transfer functions provide important constraints on the uncertainty surrounding the stratigraphic dating of the Greenland age scale and enable an improved chronological integration of ice cores as well as U–Th-dated and radiocarbon-dated paleoclimate records on a common timeline. The transfer functions are available as a Supplement to this ... |
format |
Article in Journal/Newspaper |
author |
F. Muschitiello M. A. Aquino-Lopez |
author_facet |
F. Muschitiello M. A. Aquino-Lopez |
author_sort |
F. Muschitiello |
title |
Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
title_short |
Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
title_full |
Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
title_fullStr |
Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
title_full_unstemmed |
Continuous synchronization of the Greenland ice-core and U–Th timescales using probabilistic inversion |
title_sort |
continuous synchronization of the greenland ice-core and u–th timescales using probabilistic inversion |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-1415-2024 https://doaj.org/article/1cb49e162bce4d26a0532c6f3fa0f712 |
genre |
Greenland Greenland ice core ice core Ice Sheet |
genre_facet |
Greenland Greenland ice core ice core Ice Sheet |
op_source |
Climate of the Past, Vol 20, Pp 1415-1435 (2024) |
op_relation |
https://cp.copernicus.org/articles/20/1415/2024/cp-20-1415-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-1415-2024 1814-9324 1814-9332 https://doaj.org/article/1cb49e162bce4d26a0532c6f3fa0f712 |
op_doi |
https://doi.org/10.5194/cp-20-1415-2024 |
container_title |
Climate of the Past |
container_volume |
20 |
container_issue |
6 |
container_start_page |
1415 |
op_container_end_page |
1435 |
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1810446156021366784 |