Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations
Long‐term monitoring of global mass transport within the Earth system improves our ability to mitigate natural hazards and better understand their relations to climate change. Satellite gravity is widely used to monitor surface mass variations for its unprecedented spatial and temporal coverage. How...
Published in: | Journal of Geophysical Research: Solid Earth |
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Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://orbit.dtu.dk/en/publications/6e18b295-390d-4f38-a79f-8dee95bf0032 https://doi.org/10.1029/2020JB020713 https://backend.orbit.dtu.dk/ws/files/245553276/2020JB020713.pdf https://backend.orbit.dtu.dk/ws/files/247193037/2020JB020713_2_.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/6e18b295-390d-4f38-a79f-8dee95bf0032 2024-06-23T07:45:29+00:00 Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations Jiang, Yan Wu, Xiaoping van den Broeke, Michiel R. Munneke, Peter Kuipers Simonsen, Sebastian B. van der Wal, Wouter Vermeersen, Bert L. 2021 application/pdf https://orbit.dtu.dk/en/publications/6e18b295-390d-4f38-a79f-8dee95bf0032 https://doi.org/10.1029/2020JB020713 https://backend.orbit.dtu.dk/ws/files/245553276/2020JB020713.pdf https://backend.orbit.dtu.dk/ws/files/247193037/2020JB020713_2_.pdf eng eng https://orbit.dtu.dk/en/publications/6e18b295-390d-4f38-a79f-8dee95bf0032 info:eu-repo/semantics/openAccess Jiang , Y , Wu , X , van den Broeke , M R , Munneke , P K , Simonsen , S B , van der Wal , W & Vermeersen , B L 2021 , ' Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations ' , Journal of Geophysical Research: Solid Earth , vol. 126 , e2020JB020713 . https://doi.org/10.1029/2020JB020713 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2021 ftdtupubl https://doi.org/10.1029/2020JB020713 2024-06-11T14:58:58Z Long‐term monitoring of global mass transport within the Earth system improves our ability to mitigate natural hazards and better understand their relations to climate change. Satellite gravity is widely used to monitor surface mass variations for its unprecedented spatial and temporal coverage. However, the gravity data contain signals from visco‐elastic deformation in response to past ice sheet melting, preventing us from extracting signals of present‐day surface mass trend (PDMT) directly. Here we present a global inversion scheme that separates PDMT and visco‐elastic glacial isostatic adjustment (GIA) signatures by combining satellite gravimetry with satellite altimetry and ground observations. Our inversion provides global dual data coverage that enables a robust separation of PDMT and GIA spherical harmonic coefficients. It has the advantage to provide estimates of the Earth's long wavelength deformation signatures and their uncertainties. Our GIA result, along with its uncertainty estimates, can be used in future GRACE processing to better assess the impact of GIA to surface mass change. Our GIA estimates includes rapid GIA uplift in the Southeast Alaska and the Amundsen Sea Embayment, due to the visco‐elastic response to recent glacial unloading. We estimate the average surface mass change rate from 2002‐2010 to be ‐203±3 GT·a‐1 in Greenland, ‐126±18 GT·a‐1 in Antarctica and ‐62±5 GT·a‐1 in Alaska. The GIA low degree spherical harmonic coefficients are sensitive to rheological properties in Earth's deep interior. Our low‐degree GIA estimates include geocenter motion and J̇2 which provide unique constraints to understand Earth's lower mantle and ice history. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Greenland Ice Sheet Alaska Technical University of Denmark: DTU Orbit Amundsen Sea Greenland Journal of Geophysical Research: Solid Earth 126 5 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Jiang, Yan Wu, Xiaoping van den Broeke, Michiel R. Munneke, Peter Kuipers Simonsen, Sebastian B. van der Wal, Wouter Vermeersen, Bert L. Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
description |
Long‐term monitoring of global mass transport within the Earth system improves our ability to mitigate natural hazards and better understand their relations to climate change. Satellite gravity is widely used to monitor surface mass variations for its unprecedented spatial and temporal coverage. However, the gravity data contain signals from visco‐elastic deformation in response to past ice sheet melting, preventing us from extracting signals of present‐day surface mass trend (PDMT) directly. Here we present a global inversion scheme that separates PDMT and visco‐elastic glacial isostatic adjustment (GIA) signatures by combining satellite gravimetry with satellite altimetry and ground observations. Our inversion provides global dual data coverage that enables a robust separation of PDMT and GIA spherical harmonic coefficients. It has the advantage to provide estimates of the Earth's long wavelength deformation signatures and their uncertainties. Our GIA result, along with its uncertainty estimates, can be used in future GRACE processing to better assess the impact of GIA to surface mass change. Our GIA estimates includes rapid GIA uplift in the Southeast Alaska and the Amundsen Sea Embayment, due to the visco‐elastic response to recent glacial unloading. We estimate the average surface mass change rate from 2002‐2010 to be ‐203±3 GT·a‐1 in Greenland, ‐126±18 GT·a‐1 in Antarctica and ‐62±5 GT·a‐1 in Alaska. The GIA low degree spherical harmonic coefficients are sensitive to rheological properties in Earth's deep interior. Our low‐degree GIA estimates include geocenter motion and J̇2 which provide unique constraints to understand Earth's lower mantle and ice history. |
format |
Article in Journal/Newspaper |
author |
Jiang, Yan Wu, Xiaoping van den Broeke, Michiel R. Munneke, Peter Kuipers Simonsen, Sebastian B. van der Wal, Wouter Vermeersen, Bert L. |
author_facet |
Jiang, Yan Wu, Xiaoping van den Broeke, Michiel R. Munneke, Peter Kuipers Simonsen, Sebastian B. van der Wal, Wouter Vermeersen, Bert L. |
author_sort |
Jiang, Yan |
title |
Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
title_short |
Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
title_full |
Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
title_fullStr |
Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
title_full_unstemmed |
Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations |
title_sort |
assessing global present‐day surface mass transport and glacial isostatic adjustment from inversion of geodetic observations |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/6e18b295-390d-4f38-a79f-8dee95bf0032 https://doi.org/10.1029/2020JB020713 https://backend.orbit.dtu.dk/ws/files/245553276/2020JB020713.pdf https://backend.orbit.dtu.dk/ws/files/247193037/2020JB020713_2_.pdf |
geographic |
Amundsen Sea Greenland |
geographic_facet |
Amundsen Sea Greenland |
genre |
Amundsen Sea Antarc* Antarctica Greenland Ice Sheet Alaska |
genre_facet |
Amundsen Sea Antarc* Antarctica Greenland Ice Sheet Alaska |
op_source |
Jiang , Y , Wu , X , van den Broeke , M R , Munneke , P K , Simonsen , S B , van der Wal , W & Vermeersen , B L 2021 , ' Assessing Global Present‐day Surface Mass Transport and Glacial Isostatic Adjustment from Inversion of Geodetic Observations ' , Journal of Geophysical Research: Solid Earth , vol. 126 , e2020JB020713 . https://doi.org/10.1029/2020JB020713 |
op_relation |
https://orbit.dtu.dk/en/publications/6e18b295-390d-4f38-a79f-8dee95bf0032 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020JB020713 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
126 |
container_issue |
5 |
_version_ |
1802639889756323840 |