Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting
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 futu...
Published in: | Scientific Reports |
---|---|
Main Authors: | , , , , , , |
Format: | Text |
Language: | English |
Published: |
Nature Publishing Group UK
2021
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943769/ https://doi.org/10.1038/s41598-021-84709-5 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:7943769 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:7943769 2023-05-15T16:27:51+02:00 Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting Aguiar, Wilton Meissner, Katrin J. Montenegro, Alvaro Prado, Luciana Wainer, Ilana Carlson, Anders E. Mata, Mauricio M. 2021-03-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943769/ https://doi.org/10.1038/s41598-021-84709-5 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943769/ http://dx.doi.org/10.1038/s41598-021-84709-5 © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Sci Rep Article Text 2021 ftpubmed https://doi.org/10.1038/s41598-021-84709-5 2021-03-14T02:03:34Z 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. Text Greenland Ice Sheet Labrador Sea PubMed Central (PMC) Greenland Scientific Reports 11 1 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Article |
spellingShingle |
Article Aguiar, Wilton Meissner, Katrin J. Montenegro, Alvaro Prado, Luciana Wainer, Ilana Carlson, Anders E. Mata, Mauricio M. Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting |
topic_facet |
Article |
description |
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 |
Text |
author |
Aguiar, Wilton Meissner, Katrin J. Montenegro, Alvaro Prado, Luciana Wainer, Ilana Carlson, Anders E. Mata, Mauricio M. |
author_facet |
Aguiar, Wilton Meissner, Katrin J. Montenegro, Alvaro Prado, Luciana Wainer, Ilana Carlson, Anders E. Mata, Mauricio M. |
author_sort |
Aguiar, Wilton |
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 Publishing Group UK |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943769/ https://doi.org/10.1038/s41598-021-84709-5 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Labrador Sea |
genre_facet |
Greenland Ice Sheet Labrador Sea |
op_source |
Sci Rep |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943769/ http://dx.doi.org/10.1038/s41598-021-84709-5 |
op_rights |
© The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-021-84709-5 |
container_title |
Scientific Reports |
container_volume |
11 |
container_issue |
1 |
_version_ |
1766017418517282816 |