Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view
The global character of the millennial-scale climate variability associated with the Dansgaard–Oeschger (DO) events in Greenland has been well-established for the last glacial cycle. Mainly due to the sparsity of reliable data, however, the spatial coherence of corresponding variability during the p...
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ftcopernicus:oai:publications.copernicus.org:cp80355 2023-05-15T16:28:21+02:00 Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view Rousseau, Denis-Didier Antoine, Pierre Boers, Niklas Lagroix, France Ghil, Michael Lomax, Johanna Fuchs, Markus Debret, Maxime Hatté, Christine Moine, Olivier Gauthier, Caroline Jordanova, Diana Jordanova, Neli 2020-04-09 application/pdf https://doi.org/10.5194/cp-16-713-2020 https://cp.copernicus.org/articles/16/713/2020/ eng eng doi:10.5194/cp-16-713-2020 https://cp.copernicus.org/articles/16/713/2020/ eISSN: 1814-9332 Text 2020 ftcopernicus https://doi.org/10.5194/cp-16-713-2020 2020-07-20T16:22:17Z The global character of the millennial-scale climate variability associated with the Dansgaard–Oeschger (DO) events in Greenland has been well-established for the last glacial cycle. Mainly due to the sparsity of reliable data, however, the spatial coherence of corresponding variability during the penultimate cycle is less clear. New investigations of European loess records from Marine Isotope Stage (MIS) 6 reveal the occurrence of alternating loess intervals and paleosols (incipient soil horizons), similar to those from the last climatic cycle. These paleosols are correlated, based on their stratigraphical position and numbers as well as available optically stimulated luminescence (OSL) dates, with interstadials described in various Northern Hemisphere records and in GLt_syn, the synthetic 800 kyr record of Greenland ice core δ 18 O . Therefore, referring to the interstadials described in the record of the last climate cycle in European loess sequences, the four MIS 6 interstadials can confidently be interpreted as DO-like events of the penultimate climate cycle. Six more interstadials are identified from proxy measurements performed on the same interval, leading to a total of 10 interstadials with a DO-like event status. The statistical similarity between the millennial-scale loess–paleosol oscillations during the last and penultimate climate cycle provides direct empirical evidence that the cycles of the penultimate cycle are indeed of the same nature as the DO cycles originally discovered for the last glacial cycle. Our results thus imply that their underlying cause and global imprint were characteristic of at least the last two climate cycles. Text Greenland Greenland ice core ice core Copernicus Publications: E-Journals Greenland Climate of the Past 16 2 713 727 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The global character of the millennial-scale climate variability associated with the Dansgaard–Oeschger (DO) events in Greenland has been well-established for the last glacial cycle. Mainly due to the sparsity of reliable data, however, the spatial coherence of corresponding variability during the penultimate cycle is less clear. New investigations of European loess records from Marine Isotope Stage (MIS) 6 reveal the occurrence of alternating loess intervals and paleosols (incipient soil horizons), similar to those from the last climatic cycle. These paleosols are correlated, based on their stratigraphical position and numbers as well as available optically stimulated luminescence (OSL) dates, with interstadials described in various Northern Hemisphere records and in GLt_syn, the synthetic 800 kyr record of Greenland ice core δ 18 O . Therefore, referring to the interstadials described in the record of the last climate cycle in European loess sequences, the four MIS 6 interstadials can confidently be interpreted as DO-like events of the penultimate climate cycle. Six more interstadials are identified from proxy measurements performed on the same interval, leading to a total of 10 interstadials with a DO-like event status. The statistical similarity between the millennial-scale loess–paleosol oscillations during the last and penultimate climate cycle provides direct empirical evidence that the cycles of the penultimate cycle are indeed of the same nature as the DO cycles originally discovered for the last glacial cycle. Our results thus imply that their underlying cause and global imprint were characteristic of at least the last two climate cycles. |
format |
Text |
author |
Rousseau, Denis-Didier Antoine, Pierre Boers, Niklas Lagroix, France Ghil, Michael Lomax, Johanna Fuchs, Markus Debret, Maxime Hatté, Christine Moine, Olivier Gauthier, Caroline Jordanova, Diana Jordanova, Neli |
spellingShingle |
Rousseau, Denis-Didier Antoine, Pierre Boers, Niklas Lagroix, France Ghil, Michael Lomax, Johanna Fuchs, Markus Debret, Maxime Hatté, Christine Moine, Olivier Gauthier, Caroline Jordanova, Diana Jordanova, Neli Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
author_facet |
Rousseau, Denis-Didier Antoine, Pierre Boers, Niklas Lagroix, France Ghil, Michael Lomax, Johanna Fuchs, Markus Debret, Maxime Hatté, Christine Moine, Olivier Gauthier, Caroline Jordanova, Diana Jordanova, Neli |
author_sort |
Rousseau, Denis-Didier |
title |
Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
title_short |
Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
title_full |
Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
title_fullStr |
Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
title_full_unstemmed |
Dansgaard–Oeschger-like events of the penultimate climate cycle: the loess point of view |
title_sort |
dansgaard–oeschger-like events of the penultimate climate cycle: the loess point of view |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-713-2020 https://cp.copernicus.org/articles/16/713/2020/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-16-713-2020 https://cp.copernicus.org/articles/16/713/2020/ |
op_doi |
https://doi.org/10.5194/cp-16-713-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
2 |
container_start_page |
713 |
op_container_end_page |
727 |
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1766018001899880448 |