Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)

Abstract Rising temperatures in the Arctic cause accelerated mass loss from the Greenland Ice Sheet and reduced sea ice cover. Tidewater outlet glaciers represent direct connections between glaciers and the ocean where melt rates at the ice-ocean interface are influenced by ocean temperature and cir...

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Autores principales:	Jørgen Bendtsen, John Mortensen, Kunuk Lennert, Jens K. Ehn, Wieter Boone, Virginie Galindo, Yu-bin Hu, Igor A. Dmitrenko, Sergei A. Kirillov, Kristian K. Kjeldsen, Yngve Kristoffersen, David G. Barber, Søren Rysgaard
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/47590520a4bb40d7a576d60fe250c65a
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spelling	oai:doaj.org-article:47590520a4bb40d7a576d60fe250c65a2021-12-02T16:06:18ZSea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)10.1038/s41598-017-05089-32045-2322https://doaj.org/article/47590520a4bb40d7a576d60fe250c65a2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05089-3https://doaj.org/toc/2045-2322Abstract Rising temperatures in the Arctic cause accelerated mass loss from the Greenland Ice Sheet and reduced sea ice cover. Tidewater outlet glaciers represent direct connections between glaciers and the ocean where melt rates at the ice-ocean interface are influenced by ocean temperature and circulation. However, few measurements exist near outlet glaciers from the northern coast towards the Arctic Ocean that has remained nearly permanently ice covered. Here we present hydrographic measurements along the terminus of a major retreating tidewater outlet glacier from Flade Isblink Ice Cap. We show that the region is characterized by a relatively large change of the seasonal freshwater content, corresponding to ~2 m of freshwater, and that solar heating during the short open water period results in surface layer temperatures above 1 °C. Observations of temperature and salinity supported that the outlet glacier is a floating ice shelf with near-glacial subsurface temperatures at the freezing point. Melting from the surface layer significantly influenced the ice foot morphology of the glacier terminus. Hence, melting of the tidewater outlet glacier was found to be critically dependent on the retreat of sea ice adjacent to the terminus and the duration of open water.Jørgen BendtsenJohn MortensenKunuk LennertJens K. EhnWieter BooneVirginie GalindoYu-bin HuIgor A. DmitrenkoSergei A. KirillovKristian K. KjeldsenYngve KristoffersenDavid G. BarberSøren RysgaardNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jørgen Bendtsen John Mortensen Kunuk Lennert Jens K. Ehn Wieter Boone Virginie Galindo Yu-bin Hu Igor A. Dmitrenko Sergei A. Kirillov Kristian K. Kjeldsen Yngve Kristoffersen David G. Barber Søren Rysgaard Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
description	Abstract Rising temperatures in the Arctic cause accelerated mass loss from the Greenland Ice Sheet and reduced sea ice cover. Tidewater outlet glaciers represent direct connections between glaciers and the ocean where melt rates at the ice-ocean interface are influenced by ocean temperature and circulation. However, few measurements exist near outlet glaciers from the northern coast towards the Arctic Ocean that has remained nearly permanently ice covered. Here we present hydrographic measurements along the terminus of a major retreating tidewater outlet glacier from Flade Isblink Ice Cap. We show that the region is characterized by a relatively large change of the seasonal freshwater content, corresponding to ~2 m of freshwater, and that solar heating during the short open water period results in surface layer temperatures above 1 °C. Observations of temperature and salinity supported that the outlet glacier is a floating ice shelf with near-glacial subsurface temperatures at the freezing point. Melting from the surface layer significantly influenced the ice foot morphology of the glacier terminus. Hence, melting of the tidewater outlet glacier was found to be critically dependent on the retreat of sea ice adjacent to the terminus and the duration of open water.
format	article
author	Jørgen Bendtsen John Mortensen Kunuk Lennert Jens K. Ehn Wieter Boone Virginie Galindo Yu-bin Hu Igor A. Dmitrenko Sergei A. Kirillov Kristian K. Kjeldsen Yngve Kristoffersen David G. Barber Søren Rysgaard
author_facet	Jørgen Bendtsen John Mortensen Kunuk Lennert Jens K. Ehn Wieter Boone Virginie Galindo Yu-bin Hu Igor A. Dmitrenko Sergei A. Kirillov Kristian K. Kjeldsen Yngve Kristoffersen David G. Barber Søren Rysgaard
author_sort	Jørgen Bendtsen
title	Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
title_short	Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
title_full	Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
title_fullStr	Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
title_full_unstemmed	Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)
title_sort	sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast greenland (81°n)
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/47590520a4bb40d7a576d60fe250c65a
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Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N)

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