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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2021
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Online Access: | https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/18050 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-180501 https://doi.org/10.3389/feart.2021.741789 https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g003.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g004.tif https://opus4.kobv.de/opus4-fau/files/18050/DataSheet1.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g002.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g001.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g005.tif |
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ftuniverlangen:oai:ub.uni-erlangen.de-opus:18050 2023-05-15T13:34:31+02:00 Acceleration of Dynamic Ice Loss in Antarctica From Satellite Gravimetry Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes J. Braun, Matthias H. Konrad, Hannes Fettweis, Xavier 2021-12-24 image/tiff application/pdf https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/18050 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-180501 https://doi.org/10.3389/feart.2021.741789 https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g003.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g004.tif https://opus4.kobv.de/opus4-fau/files/18050/DataSheet1.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g002.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g001.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g005.tif eng eng https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/18050 urn:nbn:de:bvb:29-opus4-180501 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-180501 https://doi.org/10.3389/feart.2021.741789 https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g003.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g004.tif https://opus4.kobv.de/opus4-fau/files/18050/DataSheet1.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g002.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g001.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g005.tif https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess CC-BY ddc:550 article doc-type:article 2021 ftuniverlangen https://doi.org/10.3389/feart.2021.741789 2022-07-28T20:40:05Z 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 OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg 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 |
institution |
Open Polar |
collection |
OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg |
op_collection_id |
ftuniverlangen |
language |
English |
topic |
ddc:550 |
spellingShingle |
ddc:550 Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes J. Braun, Matthias H. Konrad, Hannes Fettweis, Xavier Acceleration of Dynamic Ice Loss in Antarctica From Satellite Gravimetry |
topic_facet |
ddc:550 |
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 J. Braun, Matthias H. Konrad, Hannes Fettweis, Xavier |
author_facet |
Diener, Theresa Sasgen, Ingo Agosta, Cécile Fürst, Johannes J. Braun, Matthias H. 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 |
publishDate |
2021 |
url |
https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/18050 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-180501 https://doi.org/10.3389/feart.2021.741789 https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g003.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g004.tif https://opus4.kobv.de/opus4-fau/files/18050/DataSheet1.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g002.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g001.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g005.tif |
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_relation |
https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/18050 urn:nbn:de:bvb:29-opus4-180501 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-180501 https://doi.org/10.3389/feart.2021.741789 https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g003.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g004.tif https://opus4.kobv.de/opus4-fau/files/18050/DataSheet1.pdf https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g002.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g001.tif https://opus4.kobv.de/opus4-fau/files/18050/feart-09-741789-g005.tif |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.741789 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1766053920246857728 |