Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting
Abstract The northern hemisphere experienced an abrupt cold event ~ 8200 years ago (the 8.2 ka event) that was triggered by the release of meltwater into the Labrador Sea, and resulting in a weakening of the poleward oceanic heat transport. Although this event has been considered a possible analogue...
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ftdoajarticles:oai:doaj.org/article:6c2ae78533fd4434a3780a13838b44d7 2023-05-15T16:27:53+02:00 Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting Wilton Aguiar Katrin J. Meissner Alvaro Montenegro Luciana Prado Ilana Wainer Anders E. Carlson Mauricio M. Mata 2021-03-01T00:00:00Z https://doi.org/10.1038/s41598-021-84709-5 https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7 EN eng Nature Portfolio https://doi.org/10.1038/s41598-021-84709-5 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-021-84709-5 2045-2322 https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7 Scientific Reports, Vol 11, Iss 1, Pp 1-10 (2021) Medicine R Science Q article 2021 ftdoajarticles https://doi.org/10.1038/s41598-021-84709-5 2022-12-31T05:28:15Z Abstract The northern hemisphere experienced an abrupt cold event ~ 8200 years ago (the 8.2 ka event) that was triggered by the release of meltwater into the Labrador Sea, and resulting in a weakening of the poleward oceanic heat transport. Although this event has been considered a possible analogue for future ocean circulation changes due to the projected Greenland Ice Sheet (GIS) melting, large uncertainties in the amount and rate of freshwater released during the 8.2 ka event make such a comparison difficult. In this study, we compare sea surface temperatures and oxygen isotope ratios from 28 isotope-enabled model simulations with 35 paleoproxy records to constrain the meltwater released during the 8.2 ka event. Our results suggest that a combination of 5.3 m of meltwater in sea level rise equivalent (SLR) released over a thousand years, with a short intensification over ~ 130 years (an additional 2.2 m of equivalent SLR) due to routing of the Canadian river discharge, best reproduces the proxy anomalies. Our estimate is of the same order of magnitude as projected future GIS melting rates under the high emission scenario RCP8.5. Article in Journal/Newspaper Greenland Ice Sheet Labrador Sea Directory of Open Access Journals: DOAJ Articles Greenland Scientific Reports 11 1 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Medicine R Science Q |
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Medicine R Science Q Wilton Aguiar Katrin J. Meissner Alvaro Montenegro Luciana Prado Ilana Wainer Anders E. Carlson Mauricio M. Mata Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
topic_facet |
Medicine R Science Q |
description |
Abstract The northern hemisphere experienced an abrupt cold event ~ 8200 years ago (the 8.2 ka event) that was triggered by the release of meltwater into the Labrador Sea, and resulting in a weakening of the poleward oceanic heat transport. Although this event has been considered a possible analogue for future ocean circulation changes due to the projected Greenland Ice Sheet (GIS) melting, large uncertainties in the amount and rate of freshwater released during the 8.2 ka event make such a comparison difficult. In this study, we compare sea surface temperatures and oxygen isotope ratios from 28 isotope-enabled model simulations with 35 paleoproxy records to constrain the meltwater released during the 8.2 ka event. Our results suggest that a combination of 5.3 m of meltwater in sea level rise equivalent (SLR) released over a thousand years, with a short intensification over ~ 130 years (an additional 2.2 m of equivalent SLR) due to routing of the Canadian river discharge, best reproduces the proxy anomalies. Our estimate is of the same order of magnitude as projected future GIS melting rates under the high emission scenario RCP8.5. |
format |
Article in Journal/Newspaper |
author |
Wilton Aguiar Katrin J. Meissner Alvaro Montenegro Luciana Prado Ilana Wainer Anders E. Carlson Mauricio M. Mata |
author_facet |
Wilton Aguiar Katrin J. Meissner Alvaro Montenegro Luciana Prado Ilana Wainer Anders E. Carlson Mauricio M. Mata |
author_sort |
Wilton Aguiar |
title |
Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
title_short |
Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
title_full |
Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
title_fullStr |
Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
title_full_unstemmed |
Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
title_sort |
magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future greenland melting |
publisher |
Nature Portfolio |
publishDate |
2021 |
url |
https://doi.org/10.1038/s41598-021-84709-5 https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Labrador Sea |
genre_facet |
Greenland Ice Sheet Labrador Sea |
op_source |
Scientific Reports, Vol 11, Iss 1, Pp 1-10 (2021) |
op_relation |
https://doi.org/10.1038/s41598-021-84709-5 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-021-84709-5 2045-2322 https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7 |
op_doi |
https://doi.org/10.1038/s41598-021-84709-5 |
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Scientific Reports |
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11 |
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1 |
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1766017442631385088 |