Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events
The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity couple...
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ftarchimer:oai:archimer.ifremer.fr:33777 2023-05-15T14:51:09+02:00 Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events Bigg, Grant R. Levine, Richard C. Green, Clare L. 2011-12 application/pdf https://archimer.ifremer.fr/doc/00227/33777/82665.pdf https://doi.org/10.1016/j.gloplacha.2010.11.001 https://archimer.ifremer.fr/doc/00227/33777/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00227/33777/82665.pdf doi:10.1016/j.gloplacha.2010.11.001 https://archimer.ifremer.fr/doc/00227/33777/ 2010 Elsevier B.V. All rights reserved info:eu-repo/semantics/openAccess restricted use Global And Planetary Change (0921-8181) (Elsevier Science Bv), 2011-12 , Vol. 79 , N. 3-4 , P. 176-192 Heinrich events modelling Quaternary icebergs text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.1016/j.gloplacha.2010.11.001 2021-09-23T20:25:10Z The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity coupled modelling evidence to estimate the rates of change, and recovery, in oceanic climate that would be expected for such events occurring during glacial times from likely sources around the North Atlantic and Arctic periphery. We show that rates of climate change are slower for events with a European or Arctic origin. Palaeoceanographic data are presented to consider, through the model results, the origin and likely strength of major ice-rafting, or Heinrich, events during the last glacial period. We suggest that Heinrich events H1-H3 are likely to have had a significant contribution from an Arctic source as well as Hudson Strait, leading to the observed climate change. In the case of H1 and H2, we hypothesise that this secondary input is from a Laurentide Arctic source, but the dominant iceberg release for H3 is hypothesised to derive from the northern Fennoscandian Ice Sheet, rather than Hudson Strait. Earlier Heinrich events are suggested to be predominantly Hudson Strait in origin, with H6 having the lowest climate impact, and hence iceberg flux, but H4 having a climate signal of geographically variable length. We hypothesise that this is linked to a combination of climate-affecting events occurring around the globe at this time, and not just of Laurentide origin. Article in Journal/Newspaper Arctic Climate change Fennoscandian Hudson Strait Ice Sheet Iceberg* North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Global and Planetary Change 79 3-4 176 192 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Heinrich events modelling Quaternary icebergs |
spellingShingle |
Heinrich events modelling Quaternary icebergs Bigg, Grant R. Levine, Richard C. Green, Clare L. Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
topic_facet |
Heinrich events modelling Quaternary icebergs |
description |
The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity coupled modelling evidence to estimate the rates of change, and recovery, in oceanic climate that would be expected for such events occurring during glacial times from likely sources around the North Atlantic and Arctic periphery. We show that rates of climate change are slower for events with a European or Arctic origin. Palaeoceanographic data are presented to consider, through the model results, the origin and likely strength of major ice-rafting, or Heinrich, events during the last glacial period. We suggest that Heinrich events H1-H3 are likely to have had a significant contribution from an Arctic source as well as Hudson Strait, leading to the observed climate change. In the case of H1 and H2, we hypothesise that this secondary input is from a Laurentide Arctic source, but the dominant iceberg release for H3 is hypothesised to derive from the northern Fennoscandian Ice Sheet, rather than Hudson Strait. Earlier Heinrich events are suggested to be predominantly Hudson Strait in origin, with H6 having the lowest climate impact, and hence iceberg flux, but H4 having a climate signal of geographically variable length. We hypothesise that this is linked to a combination of climate-affecting events occurring around the globe at this time, and not just of Laurentide origin. |
format |
Article in Journal/Newspaper |
author |
Bigg, Grant R. Levine, Richard C. Green, Clare L. |
author_facet |
Bigg, Grant R. Levine, Richard C. Green, Clare L. |
author_sort |
Bigg, Grant R. |
title |
Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
title_short |
Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
title_full |
Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
title_fullStr |
Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
title_full_unstemmed |
Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events |
title_sort |
modelling abrupt glacial north atlantic freshening: rates of change and their implications for heinrich events |
publisher |
Elsevier Science Bv |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00227/33777/82665.pdf https://doi.org/10.1016/j.gloplacha.2010.11.001 https://archimer.ifremer.fr/doc/00227/33777/ |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Arctic Hudson Hudson Strait |
geographic_facet |
Arctic Hudson Hudson Strait |
genre |
Arctic Climate change Fennoscandian Hudson Strait Ice Sheet Iceberg* North Atlantic |
genre_facet |
Arctic Climate change Fennoscandian Hudson Strait Ice Sheet Iceberg* North Atlantic |
op_source |
Global And Planetary Change (0921-8181) (Elsevier Science Bv), 2011-12 , Vol. 79 , N. 3-4 , P. 176-192 |
op_relation |
https://archimer.ifremer.fr/doc/00227/33777/82665.pdf doi:10.1016/j.gloplacha.2010.11.001 https://archimer.ifremer.fr/doc/00227/33777/ |
op_rights |
2010 Elsevier B.V. All rights reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.gloplacha.2010.11.001 |
container_title |
Global and Planetary Change |
container_volume |
79 |
container_issue |
3-4 |
container_start_page |
176 |
op_container_end_page |
192 |
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1766322209878441984 |