A role for icebergs in the 8.2 ka climate event
We investigate the potential role of icebergs in the 8.2 ka climate event, using a coupled climate model equipped with an iceberg component. First, we evaluate the effect of a large iceberg discharge originating from the decaying Laurentide ice sheet on ocean circulation, compared to a release of an...
Published in: | Climate Dynamics |
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2009
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Online Access: | https://research.vu.nl/en/publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f https://doi.org/10.1007/s00382-009-0645-1 https://research.vu.nl/ws/files/2563657/232489.pdf |
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ftvuamstcris:oai:research.vu.nl:publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f 2024-09-15T18:10:04+00:00 A role for icebergs in the 8.2 ka climate event Wiersma, A.P. Jongma, J.I. 2009 application/pdf https://research.vu.nl/en/publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f https://doi.org/10.1007/s00382-009-0645-1 https://research.vu.nl/ws/files/2563657/232489.pdf eng eng https://research.vu.nl/en/publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f info:eu-repo/semantics/openAccess Wiersma , A P & Jongma , J I 2009 , ' A role for icebergs in the 8.2 ka climate event ' , Climate Dynamics . https://doi.org/10.1007/s00382-009-0645-1 /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2009 ftvuamstcris https://doi.org/10.1007/s00382-009-0645-1 2024-06-26T23:47:29Z We investigate the potential role of icebergs in the 8.2 ka climate event, using a coupled climate model equipped with an iceberg component. First, we evaluate the effect of a large iceberg discharge originating from the decaying Laurentide ice sheet on ocean circulation, compared to a release of an identical volume of freshwater alone. Our results show that, on top of the freshwater effect, a large iceberg discharge facilitates sea-ice growth as a result of lower sea-surface temperatures induced by latent heat of melting. This causes an 8% increased sea-ice cover, 5% stronger reduction in North Atlantic Deep Water production and 1°C lower temperature in Greenland. Second, we use the model to investigate the effect of a hypothetical two-stage lake drainage, which is suggested by several investigators to have triggered the 8.2 ka climate event. To account for the final collapse of the ice-dam holding the Laurentide Lakes we accompany the secondary freshwater pulse in one scenario with a fast 5-year iceberg discharge and in a second scenario with a slow 100-year iceberg discharge. Our experiments show that a two-stage lake drainage accompanied by the collapsing ice-dam could explain the anomalies observed around the 8.2 ka climate event in various climate records. In addition, they advocate a potential role for icebergs in the 8.2 ka climate event and illustrate the importance of latent heat of melting in the simulation of climate events that involve icebergs. Our two-stage lake drainage experiments provide a framework in the discussion of two-stage lake drainage and ice sheet collapse. © 2009 The Author(s). Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Deep Water North Atlantic Sea ice Vrije Universiteit Amsterdam (VU): Research Portal Climate Dynamics 35 2-3 535 549 |
institution |
Open Polar |
collection |
Vrije Universiteit Amsterdam (VU): Research Portal |
op_collection_id |
ftvuamstcris |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Wiersma, A.P. Jongma, J.I. A role for icebergs in the 8.2 ka climate event |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
We investigate the potential role of icebergs in the 8.2 ka climate event, using a coupled climate model equipped with an iceberg component. First, we evaluate the effect of a large iceberg discharge originating from the decaying Laurentide ice sheet on ocean circulation, compared to a release of an identical volume of freshwater alone. Our results show that, on top of the freshwater effect, a large iceberg discharge facilitates sea-ice growth as a result of lower sea-surface temperatures induced by latent heat of melting. This causes an 8% increased sea-ice cover, 5% stronger reduction in North Atlantic Deep Water production and 1°C lower temperature in Greenland. Second, we use the model to investigate the effect of a hypothetical two-stage lake drainage, which is suggested by several investigators to have triggered the 8.2 ka climate event. To account for the final collapse of the ice-dam holding the Laurentide Lakes we accompany the secondary freshwater pulse in one scenario with a fast 5-year iceberg discharge and in a second scenario with a slow 100-year iceberg discharge. Our experiments show that a two-stage lake drainage accompanied by the collapsing ice-dam could explain the anomalies observed around the 8.2 ka climate event in various climate records. In addition, they advocate a potential role for icebergs in the 8.2 ka climate event and illustrate the importance of latent heat of melting in the simulation of climate events that involve icebergs. Our two-stage lake drainage experiments provide a framework in the discussion of two-stage lake drainage and ice sheet collapse. © 2009 The Author(s). |
format |
Article in Journal/Newspaper |
author |
Wiersma, A.P. Jongma, J.I. |
author_facet |
Wiersma, A.P. Jongma, J.I. |
author_sort |
Wiersma, A.P. |
title |
A role for icebergs in the 8.2 ka climate event |
title_short |
A role for icebergs in the 8.2 ka climate event |
title_full |
A role for icebergs in the 8.2 ka climate event |
title_fullStr |
A role for icebergs in the 8.2 ka climate event |
title_full_unstemmed |
A role for icebergs in the 8.2 ka climate event |
title_sort |
role for icebergs in the 8.2 ka climate event |
publishDate |
2009 |
url |
https://research.vu.nl/en/publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f https://doi.org/10.1007/s00382-009-0645-1 https://research.vu.nl/ws/files/2563657/232489.pdf |
genre |
Greenland Ice Sheet North Atlantic Deep Water North Atlantic Sea ice |
genre_facet |
Greenland Ice Sheet North Atlantic Deep Water North Atlantic Sea ice |
op_source |
Wiersma , A P & Jongma , J I 2009 , ' A role for icebergs in the 8.2 ka climate event ' , Climate Dynamics . https://doi.org/10.1007/s00382-009-0645-1 |
op_relation |
https://research.vu.nl/en/publications/46f852b9-0b40-4aa7-82f6-ddb8569f1d6f |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00382-009-0645-1 |
container_title |
Climate Dynamics |
container_volume |
35 |
container_issue |
2-3 |
container_start_page |
535 |
op_container_end_page |
549 |
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1810447672684838912 |