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Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean

Large freshwater lakes formed in North America and Europe during deglaciation following the Last Glacial Maximum. Rapid drainage of these lakes into the Oceans resulted in abrupt perturbations in climate, including the Younger Dryas and 8.2 kyr cooling events. In the mid-latitudes of the Southern He...

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Autores principales: Glasser, Neil F., Jansson, Krister N., Duller, Geoffrey A. T., Singarayer, Joy, Holloway, Max, Harrison, Stephan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4751529/
https://www.ncbi.nlm.nih.gov/pubmed/26869235
http://dx.doi.org/10.1038/srep21064
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author Glasser, Neil F.
Jansson, Krister N.
Duller, Geoffrey A. T.
Singarayer, Joy
Holloway, Max
Harrison, Stephan
author_facet Glasser, Neil F.
Jansson, Krister N.
Duller, Geoffrey A. T.
Singarayer, Joy
Holloway, Max
Harrison, Stephan
author_sort Glasser, Neil F.
collection PubMed
description Large freshwater lakes formed in North America and Europe during deglaciation following the Last Glacial Maximum. Rapid drainage of these lakes into the Oceans resulted in abrupt perturbations in climate, including the Younger Dryas and 8.2 kyr cooling events. In the mid-latitudes of the Southern Hemisphere major glacial lakes also formed and drained during deglaciation but little is known about the magnitude, organization and timing of these drainage events and their effect on regional climate. We use 16 new single-grain optically stimulated luminescence (OSL) dates to define three stages of rapid glacial lake drainage in the Lago General Carrera/Lago Buenos Aires and Lago Cohrane/Pueyrredón basins of Patagonia and provide the first assessment of the effects of lake drainage on the Pacific Ocean. Lake drainage occurred between 13 and 8 kyr ago and was initially gradual eastward into the Atlantic, then subsequently reorganized westward into the Pacific as new drainage routes opened up during Patagonian Ice Sheet deglaciation. Coupled ocean-atmosphere model experiments using HadCM3 with an imposed freshwater surface “hosing” to simulate glacial lake drainage suggest that a negative salinity anomaly was advected south around Cape Horn, resulting in brief but significant impacts on coastal ocean vertical mixing and regional climate.
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spelling pubmed-47515292016-02-22 Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean Glasser, Neil F. Jansson, Krister N. Duller, Geoffrey A. T. Singarayer, Joy Holloway, Max Harrison, Stephan Sci Rep Article Large freshwater lakes formed in North America and Europe during deglaciation following the Last Glacial Maximum. Rapid drainage of these lakes into the Oceans resulted in abrupt perturbations in climate, including the Younger Dryas and 8.2 kyr cooling events. In the mid-latitudes of the Southern Hemisphere major glacial lakes also formed and drained during deglaciation but little is known about the magnitude, organization and timing of these drainage events and their effect on regional climate. We use 16 new single-grain optically stimulated luminescence (OSL) dates to define three stages of rapid glacial lake drainage in the Lago General Carrera/Lago Buenos Aires and Lago Cohrane/Pueyrredón basins of Patagonia and provide the first assessment of the effects of lake drainage on the Pacific Ocean. Lake drainage occurred between 13 and 8 kyr ago and was initially gradual eastward into the Atlantic, then subsequently reorganized westward into the Pacific as new drainage routes opened up during Patagonian Ice Sheet deglaciation. Coupled ocean-atmosphere model experiments using HadCM3 with an imposed freshwater surface “hosing” to simulate glacial lake drainage suggest that a negative salinity anomaly was advected south around Cape Horn, resulting in brief but significant impacts on coastal ocean vertical mixing and regional climate. Nature Publishing Group 2016-02-12 /pmc/articles/PMC4751529/ /pubmed/26869235 http://dx.doi.org/10.1038/srep21064 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Glasser, Neil F.
Jansson, Krister N.
Duller, Geoffrey A. T.
Singarayer, Joy
Holloway, Max
Harrison, Stephan
Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title_full Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title_fullStr Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title_full_unstemmed Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title_short Glacial lake drainage in Patagonia (13-8 kyr) and response of the adjacent Pacific Ocean
title_sort glacial lake drainage in patagonia (13-8 kyr) and response of the adjacent pacific ocean
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4751529/
https://www.ncbi.nlm.nih.gov/pubmed/26869235
http://dx.doi.org/10.1038/srep21064
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