Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles
The last glacial interval experienced abrupt climatic changes called Dansgaard–Oeschger (DO) events. These events manifest themselves as rapid increases followed by slow decreases of oxygen isotope ratios in Greenland ice core records. Despite promising advances, a comprehensive theory of the DO cyc...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Columbia University
2018
|
Subjects: | |
Online Access: | https://dx.doi.org/10.7916/d8gf2bhg https://academiccommons.columbia.edu/doi/10.7916/D8GF2BHG |
id |
ftdatacite:10.7916/d8gf2bhg |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.7916/d8gf2bhg 2023-05-15T13:36:17+02:00 Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles Boers, Niklas Ghil, Michael Rousseau, Denis-Didier 2018 https://dx.doi.org/10.7916/d8gf2bhg https://academiccommons.columbia.edu/doi/10.7916/D8GF2BHG unknown Columbia University https://dx.doi.org/10.1073/pnas.1802573115 Ocean circulation Ice shelves Paleoclimatology Oxygen--Isotopes Sea ice Climatic changes--Mathematical models Text Articles article-journal ScholarlyArticle 2018 ftdatacite https://doi.org/10.7916/d8gf2bhg https://doi.org/10.1073/pnas.1802573115 2021-11-05T12:55:41Z The last glacial interval experienced abrupt climatic changes called Dansgaard–Oeschger (DO) events. These events manifest themselves as rapid increases followed by slow decreases of oxygen isotope ratios in Greenland ice core records. Despite promising advances, a comprehensive theory of the DO cycles, with their repeated ups and downs of isotope ratios, is still lacking. Here, based on earlier hypotheses, we introduce a dynamical model that explains the DO variability by rapid retreat and slow regrowth of thick ice shelves and thin sea ice in conjunction with changing subsurface water temperatures due to insulation by the ice cover. Our model successfully reproduces observed features of the records, such as the sawtooth shape of the DO cycles, waiting times between DO events across the last glacial, and the shifted antiphase relationship between Greenland and Antarctic ice cores. Our results show that these features can be obtained via internal feedbacks alone. Warming subsurface waters could have also contributed to the triggering of Heinrich events. Our model thus offers a unified framework for explaining major features of multimillennial climate variability during glacial intervals. Text Antarc* Antarctic Greenland Greenland ice core ice core Ice Shelf Ice Shelves Sea ice DataCite Metadata Store (German National Library of Science and Technology) Antarctic Greenland |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Ocean circulation Ice shelves Paleoclimatology Oxygen--Isotopes Sea ice Climatic changes--Mathematical models |
spellingShingle |
Ocean circulation Ice shelves Paleoclimatology Oxygen--Isotopes Sea ice Climatic changes--Mathematical models Boers, Niklas Ghil, Michael Rousseau, Denis-Didier Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
topic_facet |
Ocean circulation Ice shelves Paleoclimatology Oxygen--Isotopes Sea ice Climatic changes--Mathematical models |
description |
The last glacial interval experienced abrupt climatic changes called Dansgaard–Oeschger (DO) events. These events manifest themselves as rapid increases followed by slow decreases of oxygen isotope ratios in Greenland ice core records. Despite promising advances, a comprehensive theory of the DO cycles, with their repeated ups and downs of isotope ratios, is still lacking. Here, based on earlier hypotheses, we introduce a dynamical model that explains the DO variability by rapid retreat and slow regrowth of thick ice shelves and thin sea ice in conjunction with changing subsurface water temperatures due to insulation by the ice cover. Our model successfully reproduces observed features of the records, such as the sawtooth shape of the DO cycles, waiting times between DO events across the last glacial, and the shifted antiphase relationship between Greenland and Antarctic ice cores. Our results show that these features can be obtained via internal feedbacks alone. Warming subsurface waters could have also contributed to the triggering of Heinrich events. Our model thus offers a unified framework for explaining major features of multimillennial climate variability during glacial intervals. |
format |
Text |
author |
Boers, Niklas Ghil, Michael Rousseau, Denis-Didier |
author_facet |
Boers, Niklas Ghil, Michael Rousseau, Denis-Didier |
author_sort |
Boers, Niklas |
title |
Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
title_short |
Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
title_full |
Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
title_fullStr |
Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
title_full_unstemmed |
Ocean circulation, ice shelf, and sea ice interactions explain Dansgaard–Oeschger cycles |
title_sort |
ocean circulation, ice shelf, and sea ice interactions explain dansgaard–oeschger cycles |
publisher |
Columbia University |
publishDate |
2018 |
url |
https://dx.doi.org/10.7916/d8gf2bhg https://academiccommons.columbia.edu/doi/10.7916/D8GF2BHG |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Shelf Ice Shelves Sea ice |
op_relation |
https://dx.doi.org/10.1073/pnas.1802573115 |
op_doi |
https://doi.org/10.7916/d8gf2bhg https://doi.org/10.1073/pnas.1802573115 |
_version_ |
1766076576410107904 |