Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream

Abstract The Barents Sea Ice Sheet was a marine-based ice sheet, i.e., it rested on the Barents Sea floor during the Last Glacial Maximum (21 ky BP). The Bjørnøyrenna Ice Stream was the largest ice stream draining the Barents Sea Ice Sheet and is regarded as an analogue for contemporary ice streams...

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Autores principales:	Michele Petrini, Florence Colleoni, Nina Kirchner, Anna L. C. Hughes, Angelo Camerlenghi, Michele Rebesco, Renata G. Lucchi, Emanuele Forte, Renato R. Colucci, Riko Noormets
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0142988d9e2143e9a6179ea6734ac79f
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spelling	oai:doaj.org-article:0142988d9e2143e9a6179ea6734ac79f2021-12-02T12:32:10ZInterplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream10.1038/s41598-018-25664-62045-2322https://doaj.org/article/0142988d9e2143e9a6179ea6734ac79f2018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25664-6https://doaj.org/toc/2045-2322Abstract The Barents Sea Ice Sheet was a marine-based ice sheet, i.e., it rested on the Barents Sea floor during the Last Glacial Maximum (21 ky BP). The Bjørnøyrenna Ice Stream was the largest ice stream draining the Barents Sea Ice Sheet and is regarded as an analogue for contemporary ice streams in West Antarctica. Here, the retreat of the Bjørnøyrenna Ice Stream is simulated by means of two numerical ice sheet models and results assessed against geological data. We investigate the sensitivity of the ice stream to changes in ocean temperature and the impact of grounding-line physics on ice stream retreat. Our results suggest that the role played by sub-shelf melting depends on how the grounding-line physics is represented in the models. When an analytic constraint on the ice flux across the grounding line is applied, the retreat of Bjørnøyrenna Ice Stream is primarily driven by internal ice dynamics rather than by oceanic forcing. This suggests that implementations of grounding-line physics need to be carefully assessed when evaluating and predicting the response of contemporary marine-based ice sheets and individual ice streams to ongoing and future ocean warming.Michele PetriniFlorence ColleoniNina KirchnerAnna L. C. HughesAngelo CamerlenghiMichele RebescoRenata G. LucchiEmanuele ForteRenato R. ColucciRiko NoormetsNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Michele Petrini Florence Colleoni Nina Kirchner Anna L. C. Hughes Angelo Camerlenghi Michele Rebesco Renata G. Lucchi Emanuele Forte Renato R. Colucci Riko Noormets Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
description	Abstract The Barents Sea Ice Sheet was a marine-based ice sheet, i.e., it rested on the Barents Sea floor during the Last Glacial Maximum (21 ky BP). The Bjørnøyrenna Ice Stream was the largest ice stream draining the Barents Sea Ice Sheet and is regarded as an analogue for contemporary ice streams in West Antarctica. Here, the retreat of the Bjørnøyrenna Ice Stream is simulated by means of two numerical ice sheet models and results assessed against geological data. We investigate the sensitivity of the ice stream to changes in ocean temperature and the impact of grounding-line physics on ice stream retreat. Our results suggest that the role played by sub-shelf melting depends on how the grounding-line physics is represented in the models. When an analytic constraint on the ice flux across the grounding line is applied, the retreat of Bjørnøyrenna Ice Stream is primarily driven by internal ice dynamics rather than by oceanic forcing. This suggests that implementations of grounding-line physics need to be carefully assessed when evaluating and predicting the response of contemporary marine-based ice sheets and individual ice streams to ongoing and future ocean warming.
format	article
author	Michele Petrini Florence Colleoni Nina Kirchner Anna L. C. Hughes Angelo Camerlenghi Michele Rebesco Renata G. Lucchi Emanuele Forte Renato R. Colucci Riko Noormets
author_facet	Michele Petrini Florence Colleoni Nina Kirchner Anna L. C. Hughes Angelo Camerlenghi Michele Rebesco Renata G. Lucchi Emanuele Forte Renato R. Colucci Riko Noormets
author_sort	Michele Petrini
title	Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
title_short	Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
title_full	Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
title_fullStr	Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
title_full_unstemmed	Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream
title_sort	interplay of grounding-line dynamics and sub-shelf melting during retreat of the bjørnøyrenna ice stream
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/0142988d9e2143e9a6179ea6734ac79f
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Interplay of grounding-line dynamics and sub-shelf melting during retreat of the Bjørnøyrenna Ice Stream

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