Heinrich events show two-stage climate response in transient glacial simulations
Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet and sailed across the Atlantic where they melted and released freshwater, as well as detritus, that formed characteristic layers on the...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:be54389efa77464297a22502fb22b369 2023-05-15T16:35:31+02:00 Heinrich events show two-stage climate response in transient glacial simulations F. A. Ziemen M.-L. Kapsch M. Klockmann U. Mikolajewicz 2019-01-01 https://doi.org/10.5194/cp-15-153-2019 https://www.clim-past.net/15/153/2019/cp-15-153-2019.pdf https://doaj.org/article/be54389efa77464297a22502fb22b369 en eng Copernicus Publications doi:10.5194/cp-15-153-2019 1814-9324 1814-9332 https://www.clim-past.net/15/153/2019/cp-15-153-2019.pdf https://doaj.org/article/be54389efa77464297a22502fb22b369 undefined Climate of the Past, Vol 15, Pp 153-168 (2019) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.5194/cp-15-153-2019 2023-01-22T19:13:37Z Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet and sailed across the Atlantic where they melted and released freshwater, as well as detritus, that formed characteristic layers on the seafloor. Heinrich events are known for cold climates in the North Atlantic region and global climate changes. We study these events in a fully coupled complex ice sheet–climate model with synchronous coupling between ice sheets and oceans. The ice discharges occur as an internal variability of the model with a recurrence period of 5 kyr, an event duration of 1–1.5 kyr, and a peak discharge rate of about 50 mSv, roughly consistent with reconstructions. The climate response shows a two-stage behavior, with freshwater release effects dominating the surge phase and ice sheet elevation effects dominating the post-surge phase. As a direct response to the freshwater discharge during the surge phase, deepwater formation in the North Atlantic decreases and the North Atlantic deepwater cell weakens by 3.5 Sv. With the reduced oceanic heat transport, the surface temperatures across the North Atlantic decrease, and the associated reduction in evaporation causes a drying in Europe. The ice discharge lowers the surface elevation in the Hudson Bay area and thus leads to increased precipitation and accelerated ice sheet regrowth in the post-surge phase. Furthermore, the jet stream widens to the north, which contributes to a weakening of the subpolar gyre and a continued cooling over Europe even after the ice discharge. This two-stage behavior can explain previously contradicting model results and understandings of Heinrich events. Article in Journal/Newspaper Hudson Bay Ice Sheet North Atlantic Unknown Hudson Hudson Bay Climate of the Past 15 1 153 168 |
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envir geo F. A. Ziemen M.-L. Kapsch M. Klockmann U. Mikolajewicz Heinrich events show two-stage climate response in transient glacial simulations |
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envir geo |
description |
Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet and sailed across the Atlantic where they melted and released freshwater, as well as detritus, that formed characteristic layers on the seafloor. Heinrich events are known for cold climates in the North Atlantic region and global climate changes. We study these events in a fully coupled complex ice sheet–climate model with synchronous coupling between ice sheets and oceans. The ice discharges occur as an internal variability of the model with a recurrence period of 5 kyr, an event duration of 1–1.5 kyr, and a peak discharge rate of about 50 mSv, roughly consistent with reconstructions. The climate response shows a two-stage behavior, with freshwater release effects dominating the surge phase and ice sheet elevation effects dominating the post-surge phase. As a direct response to the freshwater discharge during the surge phase, deepwater formation in the North Atlantic decreases and the North Atlantic deepwater cell weakens by 3.5 Sv. With the reduced oceanic heat transport, the surface temperatures across the North Atlantic decrease, and the associated reduction in evaporation causes a drying in Europe. The ice discharge lowers the surface elevation in the Hudson Bay area and thus leads to increased precipitation and accelerated ice sheet regrowth in the post-surge phase. Furthermore, the jet stream widens to the north, which contributes to a weakening of the subpolar gyre and a continued cooling over Europe even after the ice discharge. This two-stage behavior can explain previously contradicting model results and understandings of Heinrich events. |
format |
Article in Journal/Newspaper |
author |
F. A. Ziemen M.-L. Kapsch M. Klockmann U. Mikolajewicz |
author_facet |
F. A. Ziemen M.-L. Kapsch M. Klockmann U. Mikolajewicz |
author_sort |
F. A. Ziemen |
title |
Heinrich events show two-stage climate response in transient glacial simulations |
title_short |
Heinrich events show two-stage climate response in transient glacial simulations |
title_full |
Heinrich events show two-stage climate response in transient glacial simulations |
title_fullStr |
Heinrich events show two-stage climate response in transient glacial simulations |
title_full_unstemmed |
Heinrich events show two-stage climate response in transient glacial simulations |
title_sort |
heinrich events show two-stage climate response in transient glacial simulations |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-15-153-2019 https://www.clim-past.net/15/153/2019/cp-15-153-2019.pdf https://doaj.org/article/be54389efa77464297a22502fb22b369 |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay Ice Sheet North Atlantic |
genre_facet |
Hudson Bay Ice Sheet North Atlantic |
op_source |
Climate of the Past, Vol 15, Pp 153-168 (2019) |
op_relation |
doi:10.5194/cp-15-153-2019 1814-9324 1814-9332 https://www.clim-past.net/15/153/2019/cp-15-153-2019.pdf https://doaj.org/article/be54389efa77464297a22502fb22b369 |
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undefined |
op_doi |
https://doi.org/10.5194/cp-15-153-2019 |
container_title |
Climate of the Past |
container_volume |
15 |
container_issue |
1 |
container_start_page |
153 |
op_container_end_page |
168 |
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