Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming
Abstract. Continuing global warming will have a strong impact on the Greenland ice sheet in the coming centuries. During the last decade (2000–2010), both increased melt-water runoff and enhanced ice discharge from calving glaciers have contributed 0.6 ± 0.1 mm yr−1 to global sea-level rise, with a...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/305501 2023-05-15T16:28:59+02:00 Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming Fürst, Johannes Jakob Goelzer, Heiko Huybrechts, Philippe 2015-05 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/305501 https://dipot.ulb.ac.be/dspace/bitstream/2013/305501/1/doi_289145.pdf en eng uri/info:doi/10.5194/tc-9-1039-2015 https://dipot.ulb.ac.be/dspace/bitstream/2013/305501/1/doi_289145.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/305501 1 full-text file(s): info:eu-repo/semantics/openAccess The Cryosphere, 9 (3 Généralités Glaciologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2015 ftunivbruxelles 2022-06-12T21:56:32Z Abstract. Continuing global warming will have a strong impact on the Greenland ice sheet in the coming centuries. During the last decade (2000–2010), both increased melt-water runoff and enhanced ice discharge from calving glaciers have contributed 0.6 ± 0.1 mm yr−1 to global sea-level rise, with a relative contribution of 60 and 40% respectively. Here we use a higher-order ice flow model, spun up to present day, to simulate future ice volume changes driven by both atmospheric and oceanic temperature changes. For these projections, the flow model accounts for runoff-induced basal lubrication and ocean warming-induced discharge increase at the marine margins. For a suite of 10 atmosphere and ocean general circulation models and four representative concentration pathway scenarios, the projected sea-level rise between 2000 and 2100 lies in the range of +1.4 to +16.6 cm. For two low emission scenarios, the projections are conducted up to 2300. Ice loss rates are found to abate for the most favourable scenario where the warming peaks in this century, allowing the ice sheet to maintain a geometry close to the present-day state. For the other moderate scenario, loss rates remain at a constant level over 300 years. In any scenario, volume loss is predominantly caused by increased surface melting as the contribution from enhanced ice discharge decreases over time and is self-limited by thinning and retreat of the marine margin, reducing the ice–ocean contact area. As confirmed by other studies, we find that the effect of enhanced basal lubrication on the volume evolution is negligible on centennial timescales. Our projections show that the observed rates of volume change over the last decades cannot simply be extrapolated over the 21st century on account of a different balance of processes causing ice loss over time. Our results also indicate that the largest source of uncertainty arises from the surface mass balance and the underlying climate change projections, not from ice dynamics. info:eu-repo/semantics/published Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Greenland |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Généralités Glaciologie |
spellingShingle |
Généralités Glaciologie Fürst, Johannes Jakob Goelzer, Heiko Huybrechts, Philippe Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
topic_facet |
Généralités Glaciologie |
description |
Abstract. Continuing global warming will have a strong impact on the Greenland ice sheet in the coming centuries. During the last decade (2000–2010), both increased melt-water runoff and enhanced ice discharge from calving glaciers have contributed 0.6 ± 0.1 mm yr−1 to global sea-level rise, with a relative contribution of 60 and 40% respectively. Here we use a higher-order ice flow model, spun up to present day, to simulate future ice volume changes driven by both atmospheric and oceanic temperature changes. For these projections, the flow model accounts for runoff-induced basal lubrication and ocean warming-induced discharge increase at the marine margins. For a suite of 10 atmosphere and ocean general circulation models and four representative concentration pathway scenarios, the projected sea-level rise between 2000 and 2100 lies in the range of +1.4 to +16.6 cm. For two low emission scenarios, the projections are conducted up to 2300. Ice loss rates are found to abate for the most favourable scenario where the warming peaks in this century, allowing the ice sheet to maintain a geometry close to the present-day state. For the other moderate scenario, loss rates remain at a constant level over 300 years. In any scenario, volume loss is predominantly caused by increased surface melting as the contribution from enhanced ice discharge decreases over time and is self-limited by thinning and retreat of the marine margin, reducing the ice–ocean contact area. As confirmed by other studies, we find that the effect of enhanced basal lubrication on the volume evolution is negligible on centennial timescales. Our projections show that the observed rates of volume change over the last decades cannot simply be extrapolated over the 21st century on account of a different balance of processes causing ice loss over time. Our results also indicate that the largest source of uncertainty arises from the surface mass balance and the underlying climate change projections, not from ice dynamics. info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Fürst, Johannes Jakob Goelzer, Heiko Huybrechts, Philippe |
author_facet |
Fürst, Johannes Jakob Goelzer, Heiko Huybrechts, Philippe |
author_sort |
Fürst, Johannes Jakob |
title |
Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
title_short |
Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
title_full |
Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
title_fullStr |
Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
title_full_unstemmed |
Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming |
title_sort |
ice-dynamic projections of the greenland ice sheet in response to atmospheric and oceanic warming |
publishDate |
2015 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/305501 https://dipot.ulb.ac.be/dspace/bitstream/2013/305501/1/doi_289145.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, 9 (3 |
op_relation |
uri/info:doi/10.5194/tc-9-1039-2015 https://dipot.ulb.ac.be/dspace/bitstream/2013/305501/1/doi_289145.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/305501 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766018670714159104 |