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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Autores principales:	Wilton Aguiar, Katrin J. Meissner, Alvaro Montenegro, Luciana Prado, Ilana Wainer, Anders E. Carlson, Mauricio M. Mata
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7
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spelling	oai:doaj.org-article:6c2ae78533fd4434a3780a13838b44d72021-12-02T13:34:47ZMagnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting10.1038/s41598-021-84709-52045-2322https://doaj.org/article/6c2ae78533fd4434a3780a13838b44d72021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84709-5https://doaj.org/toc/2045-2322Abstract 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.Wilton AguiarKatrin J. MeissnerAlvaro MontenegroLuciana PradoIlana WainerAnders E. CarlsonMauricio M. MataNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	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
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
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://doaj.org/article/6c2ae78533fd4434a3780a13838b44d7
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Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting

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