Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier

Abstract The early 2000s accelerated ice-mass loss from large outlet glaciers in W and SE Greenland has been linked to warming of the subpolar North Atlantic. To investigate the uniqueness of this event, we extend the record of glacier and ocean changes back 1700 years by analyzing a sediment core f...

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Autores principales:	Camilla S. Andresen, Ulla Kokfelt, Marie-Alexandrine Sicre, Mads Faurschou Knudsen, Laurence M. Dyke, Vincent Klein, Fanny Kaczmar, Martin W. Miles, David Wangner
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/76556ad026674ec4a06b5c23da7d0be3
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spelling	oai:doaj.org-article:76556ad026674ec4a06b5c23da7d0be32021-12-02T15:06:18ZExceptional 20th century glaciological regime of a major SE Greenland outlet glacier10.1038/s41598-017-13246-x2045-2322https://doaj.org/article/76556ad026674ec4a06b5c23da7d0be32017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13246-xhttps://doaj.org/toc/2045-2322Abstract The early 2000s accelerated ice-mass loss from large outlet glaciers in W and SE Greenland has been linked to warming of the subpolar North Atlantic. To investigate the uniqueness of this event, we extend the record of glacier and ocean changes back 1700 years by analyzing a sediment core from Sermilik Fjord near Helheim Glacier in SE Greenland. We show that multidecadal to centennial increases in alkenone-inferred Atlantic Water SSTs on the shelf occurred at times of reduced solar activity during the Little Ice Age, when the subpolar gyre weakened and shifted westward promoted by atmospheric blocking events. Helheim Glacier responded to many of these episodes with increased calving, but despite earlier multidecadal warming episodes matching the 20th century high SSTs in magnitude, the glacier behaved differently during the 20th century. We suggest the presence of a floating ice tongue since at least 300 AD lasting until 1900 AD followed by elevated 20th century glacier calving due to the loss of the tongue. We attribute this regime shift to 20th century unprecedented low sea-ice occurrence in the East Greenland Current and conclude that properties of this current are important for the stability of the present ice tongues in NE Greenland.Camilla S. AndresenUlla KokfeltMarie-Alexandrine SicreMads Faurschou KnudsenLaurence M. DykeVincent KleinFanny KaczmarMartin W. MilesDavid WangnerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Camilla S. Andresen Ulla Kokfelt Marie-Alexandrine Sicre Mads Faurschou Knudsen Laurence M. Dyke Vincent Klein Fanny Kaczmar Martin W. Miles David Wangner Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
description	Abstract The early 2000s accelerated ice-mass loss from large outlet glaciers in W and SE Greenland has been linked to warming of the subpolar North Atlantic. To investigate the uniqueness of this event, we extend the record of glacier and ocean changes back 1700 years by analyzing a sediment core from Sermilik Fjord near Helheim Glacier in SE Greenland. We show that multidecadal to centennial increases in alkenone-inferred Atlantic Water SSTs on the shelf occurred at times of reduced solar activity during the Little Ice Age, when the subpolar gyre weakened and shifted westward promoted by atmospheric blocking events. Helheim Glacier responded to many of these episodes with increased calving, but despite earlier multidecadal warming episodes matching the 20th century high SSTs in magnitude, the glacier behaved differently during the 20th century. We suggest the presence of a floating ice tongue since at least 300 AD lasting until 1900 AD followed by elevated 20th century glacier calving due to the loss of the tongue. We attribute this regime shift to 20th century unprecedented low sea-ice occurrence in the East Greenland Current and conclude that properties of this current are important for the stability of the present ice tongues in NE Greenland.
format	article
author	Camilla S. Andresen Ulla Kokfelt Marie-Alexandrine Sicre Mads Faurschou Knudsen Laurence M. Dyke Vincent Klein Fanny Kaczmar Martin W. Miles David Wangner
author_facet	Camilla S. Andresen Ulla Kokfelt Marie-Alexandrine Sicre Mads Faurschou Knudsen Laurence M. Dyke Vincent Klein Fanny Kaczmar Martin W. Miles David Wangner
author_sort	Camilla S. Andresen
title	Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
title_short	Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
title_full	Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
title_fullStr	Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
title_full_unstemmed	Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier
title_sort	exceptional 20th century glaciological regime of a major se greenland outlet glacier
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/76556ad026674ec4a06b5c23da7d0be3
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_version_	1718388521315598336

Exceptional 20th century glaciological regime of a major SE Greenland outlet glacier

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