Acceleration of Dynamic Ice Loss in Antarctica From Satellite Gravimetry
peer reviewed 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 o...
Published in: | Frontiers in Earth Science |
---|---|
Main Authors: | , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2021
|
Subjects: | |
Online Access: | https://orbi.uliege.be/handle/2268/266544 https://orbi.uliege.be/bitstream/2268/266544/1/feart-09-741789.pdf https://doi.org/10.3389/feart.2021.741789 |
id |
ftorbi:oai:orbi.ulg.ac.be:2268/266544 |
---|---|
record_format |
openpolar |
spelling |
ftorbi:oai:orbi.ulg.ac.be:2268/266544 2024-10-13T14:01:51+00:00 Acceleration of Dynamic Ice Loss in Antarctica From Satellite Gravimetry Diener, T. Sasgen, I. Agosta, C. Furst, J. Braun, M. Konrad, H. Fettweis, Xavier Sphères - SPHERES 2021-12-24 https://orbi.uliege.be/handle/2268/266544 https://orbi.uliege.be/bitstream/2268/266544/1/feart-09-741789.pdf https://doi.org/10.3389/feart.2021.741789 en eng Springer https://www.frontiersin.org/articles/10.3389/feart.2021.741789/full urn:issn:1863-4621 https://orbi.uliege.be/handle/2268/266544 info:hdl:2268/266544 doi:10.3389/feart.2021.741789 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Frontiers in Earth Sciences (2021-12-24) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2021 ftorbi https://doi.org/10.3389/feart.2021.741789 2024-09-30T14:23:32Z peer reviewed 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 University of Liège: ORBi (Open Repository and Bibliography) Antarctic The Antarctic Dronning Maud Land Bellingshausen Sea Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Diener, T. Sasgen, I. Agosta, C. Furst, J. Braun, M. Konrad, H. Fettweis, Xavier Acceleration of Dynamic Ice Loss in Antarctica From Satellite Gravimetry |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed 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. |
author2 |
Sphères - SPHERES |
format |
Article in Journal/Newspaper |
author |
Diener, T. Sasgen, I. Agosta, C. Furst, J. Braun, M. Konrad, H. Fettweis, Xavier |
author_facet |
Diener, T. Sasgen, I. Agosta, C. Furst, J. Braun, M. Konrad, H. Fettweis, Xavier |
author_sort |
Diener, T. |
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 |
Springer |
publishDate |
2021 |
url |
https://orbi.uliege.be/handle/2268/266544 https://orbi.uliege.be/bitstream/2268/266544/1/feart-09-741789.pdf https://doi.org/10.3389/feart.2021.741789 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic The Antarctic Dronning Maud Land Bellingshausen Sea Ronne Ice Shelf |
geographic_facet |
Antarctic The Antarctic Dronning Maud Land Bellingshausen Sea Ronne Ice Shelf |
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 |
Frontiers in Earth Sciences (2021-12-24) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2021.741789/full urn:issn:1863-4621 https://orbi.uliege.be/handle/2268/266544 info:hdl:2268/266544 doi:10.3389/feart.2021.741789 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2021.741789 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1812813170818940928 |