Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt
Mass loss from glaciers and ice sheets currently accounts for two-thirds of the observed global sea-level rise and has accelerated since the 1990s, coincident with strong atmospheric warming in the Polar Regions. Here we present continuous GPS measurements and satellite synthetic aperture radar base...
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ftoslouniv:oai:www.duo.uio.no:10852/43693 2023-05-15T14:27:46+02:00 Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH 2014-09-15T10:38:24Z http://hdl.handle.net/10852/43693 http://urn.nb.no/URN:NBN:no-48049 https://doi.org/10.5194/tcd-8-2685-2014 EN eng Copernicus GmbH http://urn.nb.no/URN:NBN:no-48049 Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH . Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt. The Cryosphere Discussions. 2014, 8, 2685-2719 http://hdl.handle.net/10852/43693 1154396 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The Cryosphere Discussions&rft.volume=8&rft.spage=2685&rft.date=2014 The Cryosphere Discussions 8 2685 2719 http://dx.doi.org/10.5194/tcd-8-2685-2014 URN:NBN:no-48049 Fulltext https://www.duo.uio.no/bitstream/handle/10852/43693/4/tcd-8-2685-2014.pdf Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ CC-BY 1994-0432 Journal article Tidsskriftartikkel PublishedVersion 2014 ftoslouniv https://doi.org/10.5194/tcd-8-2685-2014 2020-06-21T08:48:17Z Mass loss from glaciers and ice sheets currently accounts for two-thirds of the observed global sea-level rise and has accelerated since the 1990s, coincident with strong atmospheric warming in the Polar Regions. Here we present continuous GPS measurements and satellite synthetic aperture radar based velocity maps from the Austfonna ice cap, Svalbard, that demonstrate strong links between surface-melt and multiannual ice-flow acceleration. We identify a hydro-thermodynamic feedback that successively mobilizes stagnant ice regions, initially frozen to their bed, thereby facilitating fast basal motion over an expanding area. By autumn 2012, successive destabilization of the marine terminus escalated in a surge of the ice cap's largest drainage basin, Basin-3. The resulting iceberg discharge of 4.2 ± 1.6 Gt a−1 over the period April 2012 to May 2013 triples the calving loss from the entire ice cap. After accounting for the terminus advance, the related sea-level rise contribution of 7.2 ± 2.6 Gt a−1 matches the recent annual ice-mass loss from the entire Svalbard archipelago. Our study highlights the importance of dynamic glacier wastage and illuminates mechanisms that may trigger a sustained increase in dynamic glacier wastage or the disintegration of ice-sheets in response to climate warming, which is acknowledged but not quantified in global projections of sea-level rise. Article in Journal/Newspaper Arctic Arctic Austfonna glacier Ice cap Iceberg* Svalbard The Cryosphere The Cryosphere Discussions Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Svalbard Svalbard Archipelago |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Mass loss from glaciers and ice sheets currently accounts for two-thirds of the observed global sea-level rise and has accelerated since the 1990s, coincident with strong atmospheric warming in the Polar Regions. Here we present continuous GPS measurements and satellite synthetic aperture radar based velocity maps from the Austfonna ice cap, Svalbard, that demonstrate strong links between surface-melt and multiannual ice-flow acceleration. We identify a hydro-thermodynamic feedback that successively mobilizes stagnant ice regions, initially frozen to their bed, thereby facilitating fast basal motion over an expanding area. By autumn 2012, successive destabilization of the marine terminus escalated in a surge of the ice cap's largest drainage basin, Basin-3. The resulting iceberg discharge of 4.2 ± 1.6 Gt a−1 over the period April 2012 to May 2013 triples the calving loss from the entire ice cap. After accounting for the terminus advance, the related sea-level rise contribution of 7.2 ± 2.6 Gt a−1 matches the recent annual ice-mass loss from the entire Svalbard archipelago. Our study highlights the importance of dynamic glacier wastage and illuminates mechanisms that may trigger a sustained increase in dynamic glacier wastage or the disintegration of ice-sheets in response to climate warming, which is acknowledged but not quantified in global projections of sea-level rise. |
format |
Article in Journal/Newspaper |
author |
Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH |
spellingShingle |
Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
author_facet |
Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH |
author_sort |
Dunse, Thorben |
title |
Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
title_short |
Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
title_full |
Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
title_fullStr |
Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
title_full_unstemmed |
Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
title_sort |
destabilisation of an arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt |
publisher |
Copernicus GmbH |
publishDate |
2014 |
url |
http://hdl.handle.net/10852/43693 http://urn.nb.no/URN:NBN:no-48049 https://doi.org/10.5194/tcd-8-2685-2014 |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) |
geographic |
Arctic Austfonna Svalbard Svalbard Archipelago |
geographic_facet |
Arctic Austfonna Svalbard Svalbard Archipelago |
genre |
Arctic Arctic Austfonna glacier Ice cap Iceberg* Svalbard The Cryosphere The Cryosphere Discussions |
genre_facet |
Arctic Arctic Austfonna glacier Ice cap Iceberg* Svalbard The Cryosphere The Cryosphere Discussions |
op_source |
1994-0432 |
op_relation |
http://urn.nb.no/URN:NBN:no-48049 Dunse, Thorben Schellenberger, Thomas Hagen, Jon Ove Methlie Kääb, Andreas Schuler, Thomas Reijmer, CH . Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt. The Cryosphere Discussions. 2014, 8, 2685-2719 http://hdl.handle.net/10852/43693 1154396 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The Cryosphere Discussions&rft.volume=8&rft.spage=2685&rft.date=2014 The Cryosphere Discussions 8 2685 2719 http://dx.doi.org/10.5194/tcd-8-2685-2014 URN:NBN:no-48049 Fulltext https://www.duo.uio.no/bitstream/handle/10852/43693/4/tcd-8-2685-2014.pdf |
op_rights |
Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tcd-8-2685-2014 |
_version_ |
1766301678382874624 |