Acceleration of dynamic ice loss in Antarctica from satellite gravimetry
The dynamic stability of the Antarctic Ice Sheet is one of the largest uncertainties in projections of future global sea-level rise. Essential for improving projections of the ice sheet evolution is the understanding of the ongoing trends and accelerations of mass loss in the context of ice dynamics...
Published in: | Frontiers in Earth Science |
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Online Access: | https://epic.awi.de/id/eprint/56294/ https://epic.awi.de/id/eprint/56294/1/feart-09-741789.pdf https://www.frontiersin.org/articles/10.3389/feart.2021.741789/full#B61 https://hdl.handle.net/10013/epic.d161da50-3451-43a3-ad2d-a22879023152 |
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ftawi:oai:epic.awi.de:56294 2024-09-09T19:10:21+00:00 Acceleration of dynamic ice loss in Antarctica from satellite gravimetry Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes Jakob Braun, Matthias Holger Konrad, Hannes Fettweis, Xavier 2021 application/pdf https://epic.awi.de/id/eprint/56294/ https://epic.awi.de/id/eprint/56294/1/feart-09-741789.pdf https://www.frontiersin.org/articles/10.3389/feart.2021.741789/full#B61 https://hdl.handle.net/10013/epic.d161da50-3451-43a3-ad2d-a22879023152 unknown Frontiers https://epic.awi.de/id/eprint/56294/1/feart-09-741789.pdf Diener, T. , Sasgen, I. orcid:0000-0002-8993-0989 , Agosta, C. , Fürst, J. J. , Braun, M. H. , Konrad, H. and Fettweis, X. (2021) Acceleration of dynamic ice loss in Antarctica from satellite gravimetry , Frontiers in Earth Science, 9 , p. 1266 . doi:10.3389/feart.2021.741789 <https://doi.org/10.3389/feart.2021.741789> , hdl:10013/epic.d161da50-3451-43a3-ad2d-a22879023152 EPIC3Frontiers in Earth Science, Frontiers, 9, pp. 1266, ISSN: 9 Article isiRev 2021 ftawi https://doi.org/10.3389/feart.2021.741789 2024-06-24T04:28:46Z The dynamic stability of the Antarctic Ice Sheet is one of the largest uncertainties in projections of future global sea-level rise. Essential for improving projections of the ice sheet evolution is the understanding of the ongoing trends and accelerations of mass loss in the context of ice dynamics. Here, we examine accelerations of mass change of the Antarctic Ice Sheet from 2002 to 2020 using data from the GRACE (Gravity Recovery and Climate Experiment; 2002–2017) and its follow-on GRACE-FO (2018-present) satellite missions. By subtracting estimates of net snow accumulation provided by re-analysis data and regional climate models from GRACE/GRACE-FO mass changes, we isolate variations in ice-dynamic discharge and compare them to direct measurements based on the remote sensing of the surface-ice velocity (2002–2017). We show that variations in the GRACE/GRACE-FO time series are modulated by variations in regional snow accumulation caused by large-scale atmospheric circulation. We show for the first time that, after removal of these surface effects, accelerations of ice-dynamic discharge from GRACE/GRACE-FO agree well with those independently derived from surface-ice velocities. For 2002–2020, we recover a discharge acceleration of -5.3 ± 2.2 Gt yr−2 for the entire ice sheet; these increasing losses originate mainly in the Amundsen and Bellingshausen Sea Embayment regions (68%), with additional significant contributions from Dronning Maud Land (18%) and the Filchner-Ronne Ice Shelf region (13%). Under the assumption that the recovered rates and accelerations of mass loss persisted independent of any external forcing, Antarctica would contribute 7.6 ± 2.9 cm to global mean sea-level rise by the year 2100, more than two times the amount of 2.9 ± 0.6 cm obtained by linear extrapolation of current GRACE/GRACE-FO mass loss trends. Article in Journal/Newspaper Antarc* Antarctic Antarctica Bellingshausen Sea Dronning Maud Land Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Bellingshausen Sea Dronning Maud Land Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) The Antarctic Frontiers in Earth Science 9 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The dynamic stability of the Antarctic Ice Sheet is one of the largest uncertainties in projections of future global sea-level rise. Essential for improving projections of the ice sheet evolution is the understanding of the ongoing trends and accelerations of mass loss in the context of ice dynamics. Here, we examine accelerations of mass change of the Antarctic Ice Sheet from 2002 to 2020 using data from the GRACE (Gravity Recovery and Climate Experiment; 2002–2017) and its follow-on GRACE-FO (2018-present) satellite missions. By subtracting estimates of net snow accumulation provided by re-analysis data and regional climate models from GRACE/GRACE-FO mass changes, we isolate variations in ice-dynamic discharge and compare them to direct measurements based on the remote sensing of the surface-ice velocity (2002–2017). We show that variations in the GRACE/GRACE-FO time series are modulated by variations in regional snow accumulation caused by large-scale atmospheric circulation. We show for the first time that, after removal of these surface effects, accelerations of ice-dynamic discharge from GRACE/GRACE-FO agree well with those independently derived from surface-ice velocities. For 2002–2020, we recover a discharge acceleration of -5.3 ± 2.2 Gt yr−2 for the entire ice sheet; these increasing losses originate mainly in the Amundsen and Bellingshausen Sea Embayment regions (68%), with additional significant contributions from Dronning Maud Land (18%) and the Filchner-Ronne Ice Shelf region (13%). Under the assumption that the recovered rates and accelerations of mass loss persisted independent of any external forcing, Antarctica would contribute 7.6 ± 2.9 cm to global mean sea-level rise by the year 2100, more than two times the amount of 2.9 ± 0.6 cm obtained by linear extrapolation of current GRACE/GRACE-FO mass loss trends. |
format |
Article in Journal/Newspaper |
author |
Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes Jakob Braun, Matthias Holger Konrad, Hannes Fettweis, Xavier |
spellingShingle |
Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes Jakob Braun, Matthias Holger Konrad, Hannes Fettweis, Xavier Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
author_facet |
Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes Jakob Braun, Matthias Holger Konrad, Hannes Fettweis, Xavier |
author_sort |
Diener, Theresa |
title |
Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
title_short |
Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
title_full |
Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
title_fullStr |
Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
title_full_unstemmed |
Acceleration of dynamic ice loss in Antarctica from satellite gravimetry |
title_sort |
acceleration of dynamic ice loss in antarctica from satellite gravimetry |
publisher |
Frontiers |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/56294/ https://epic.awi.de/id/eprint/56294/1/feart-09-741789.pdf https://www.frontiersin.org/articles/10.3389/feart.2021.741789/full#B61 https://hdl.handle.net/10013/epic.d161da50-3451-43a3-ad2d-a22879023152 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Bellingshausen Sea Dronning Maud Land Ronne Ice Shelf The Antarctic |
geographic_facet |
Antarctic Bellingshausen Sea Dronning Maud Land Ronne Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Bellingshausen Sea Dronning Maud Land Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Bellingshausen Sea Dronning Maud Land Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf |
op_source |
EPIC3Frontiers in Earth Science, Frontiers, 9, pp. 1266, ISSN: 9 |
op_relation |
https://epic.awi.de/id/eprint/56294/1/feart-09-741789.pdf Diener, T. , Sasgen, I. orcid:0000-0002-8993-0989 , Agosta, C. , Fürst, J. J. , Braun, M. H. , Konrad, H. and Fettweis, X. (2021) Acceleration of dynamic ice loss in Antarctica from satellite gravimetry , Frontiers in Earth Science, 9 , p. 1266 . doi:10.3389/feart.2021.741789 <https://doi.org/10.3389/feart.2021.741789> , hdl:10013/epic.d161da50-3451-43a3-ad2d-a22879023152 |
op_doi |
https://doi.org/10.3389/feart.2021.741789 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1809825256520548352 |