Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions
International audience Climate and ocean circulation in the North Atlantic region changed over the course of the Holocene, partly because of disintegrating ice sheets and partly because of an orbital-induced insolation trend. In the Nordic Seas, this impact was accompanied by a rather small, but sig...
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Online Access: | https://hal.science/hal-01805163 https://hal.science/hal-01805163/document https://hal.science/hal-01805163/file/2015PA002828.pdf https://doi.org/10.1002/2015PA002828 |
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ftinsu:oai:HAL:hal-01805163v1 2024-04-28T08:21:33+00:00 Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions Blaschek, M. Renssen, H. Kissel, Catherine Thornalley, D. Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Climat et Magnétisme (CLIMAG) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) University College of London London (UCL) Woods Hole Oceanographic Institution (WHOI) 2015 https://hal.science/hal-01805163 https://hal.science/hal-01805163/document https://hal.science/hal-01805163/file/2015PA002828.pdf https://doi.org/10.1002/2015PA002828 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002828 hal-01805163 https://hal.science/hal-01805163 https://hal.science/hal-01805163/document https://hal.science/hal-01805163/file/2015PA002828.pdf doi:10.1002/2015PA002828 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01805163 Paleoceanography, 2015, 30 (11), pp.1503 - 1524. ⟨10.1002/2015PA002828⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.1002/2015PA002828 2024-04-05T00:40:57Z International audience Climate and ocean circulation in the North Atlantic region changed over the course of the Holocene, partly because of disintegrating ice sheets and partly because of an orbital-induced insolation trend. In the Nordic Seas, this impact was accompanied by a rather small, but significant, amount of Greenland ice sheet melting. We have employed the EMIC LOVECLIM and compared our model simulations with proxy-based reconstructions of δ 13 C, sortable silt, and magnetic susceptibility (κ) used to infer changes in past ocean circulation over the last 9000 years. The various reconstructions exhibit different long-term evolutions suggesting changes in either the overturning of the Atlantic in total or of subcomponents of the ocean circulation, such as the overflow waters across the Greenland-Scotland ridge. Thus, the question arises whether these reconstructions are consistent with each other or not. A comparison with model results indicates that δ 13 C, employed as an indicator of overturning, agrees well with the long-term evolution of the modeled Atlantic meridional overturning circulation (AMOC). The model results suggest that different long-term trends in subcomponents of the AMOC, such as Iceland-Scotland overflow water, are consistent with proxy-based reconstructions and allow some of the reconstructions to be reconciled with the modeled and reconstructed (from δ 13 C) AMOC evolution. We find a weak early Holocene AMOC, which recovers by 7 kyr B.P. and shows a weak increasing trend of 88 ± 1 mSv/kyr toward present, with relatively low variability on centennial to millennial timescales. Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Ice Sheet Iceland Nordic Seas North Atlantic Sea ice Institut national des sciences de l'Univers: HAL-INSU Paleoceanography 30 11 1503 1524 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Blaschek, M. Renssen, H. Kissel, Catherine Thornalley, D. Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Climate and ocean circulation in the North Atlantic region changed over the course of the Holocene, partly because of disintegrating ice sheets and partly because of an orbital-induced insolation trend. In the Nordic Seas, this impact was accompanied by a rather small, but significant, amount of Greenland ice sheet melting. We have employed the EMIC LOVECLIM and compared our model simulations with proxy-based reconstructions of δ 13 C, sortable silt, and magnetic susceptibility (κ) used to infer changes in past ocean circulation over the last 9000 years. The various reconstructions exhibit different long-term evolutions suggesting changes in either the overturning of the Atlantic in total or of subcomponents of the ocean circulation, such as the overflow waters across the Greenland-Scotland ridge. Thus, the question arises whether these reconstructions are consistent with each other or not. A comparison with model results indicates that δ 13 C, employed as an indicator of overturning, agrees well with the long-term evolution of the modeled Atlantic meridional overturning circulation (AMOC). The model results suggest that different long-term trends in subcomponents of the AMOC, such as Iceland-Scotland overflow water, are consistent with proxy-based reconstructions and allow some of the reconstructions to be reconciled with the modeled and reconstructed (from δ 13 C) AMOC evolution. We find a weak early Holocene AMOC, which recovers by 7 kyr B.P. and shows a weak increasing trend of 88 ± 1 mSv/kyr toward present, with relatively low variability on centennial to millennial timescales. |
author2 |
Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Climat et Magnétisme (CLIMAG) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) University College of London London (UCL) Woods Hole Oceanographic Institution (WHOI) |
format |
Article in Journal/Newspaper |
author |
Blaschek, M. Renssen, H. Kissel, Catherine Thornalley, D. |
author_facet |
Blaschek, M. Renssen, H. Kissel, Catherine Thornalley, D. |
author_sort |
Blaschek, M. |
title |
Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
title_short |
Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
title_full |
Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
title_fullStr |
Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
title_full_unstemmed |
Holocene North Atlantic Overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
title_sort |
holocene north atlantic overturning in an atmosphere-ocean-sea ice model compared to proxy-based reconstructions |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01805163 https://hal.science/hal-01805163/document https://hal.science/hal-01805163/file/2015PA002828.pdf https://doi.org/10.1002/2015PA002828 |
genre |
Greenland Greenland-Scotland Ridge Ice Sheet Iceland Nordic Seas North Atlantic Sea ice |
genre_facet |
Greenland Greenland-Scotland Ridge Ice Sheet Iceland Nordic Seas North Atlantic Sea ice |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01805163 Paleoceanography, 2015, 30 (11), pp.1503 - 1524. ⟨10.1002/2015PA002828⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002828 hal-01805163 https://hal.science/hal-01805163 https://hal.science/hal-01805163/document https://hal.science/hal-01805163/file/2015PA002828.pdf doi:10.1002/2015PA002828 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015PA002828 |
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Paleoceanography |
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30 |
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11 |
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1503 |
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1524 |
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