Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS
SUMMARY Nonlinear trends (i.e. quadratic trends, usually defined as accelerations) in Antarctic ice mass loss due primarily to the complex climate warming forcing regimes have induced large uncertainty to future sea level projection. Here, we quantify the nonlinear and spatially varying mass losses...
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croxfordunivpr:10.1093/gji/ggac485 2024-10-06T13:42:05+00:00 Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS Jiao, Jiashuang Pan, Yuanjin Zhang, Xiaohong Shum, C K Zhang, Yu Ding, Hao National Natural Science Foundation of China China Postdoctoral Science Foundation 2022 http://dx.doi.org/10.1093/gji/ggac485 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac485/47646752/ggac485.pdf https://academic.oup.com/gji/article-pdf/233/2/826/48517052/ggac485.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Geophysical Journal International volume 233, issue 2, page 826-838 ISSN 0956-540X 1365-246X journal-article 2022 croxfordunivpr https://doi.org/10.1093/gji/ggac485 2024-09-10T04:14:17Z SUMMARY Nonlinear trends (i.e. quadratic trends, usually defined as accelerations) in Antarctic ice mass loss due primarily to the complex climate warming forcing regimes have induced large uncertainty to future sea level projection. Here, we quantify the nonlinear and spatially varying mass losses in the Antarctic ice sheet during the last two decades using the satellite gravimetry data collected by Gravity Recovery And Climate Experiment (GRACE) and its successor GRACE Follow-On. We use a regional inversion methodology to generate the mass change time-series over Antarctica. Our findings reveal that seven regions have evidenced significant nonlinear mass change. These regions are all concentrated along the coast of Antarctica and show spatially heterogeneous mass balance nonlinear trend patterns. Among them, the Amundsen Sea Embayment (ASE) and the Dronning Maud Land (DML) are found to be particularly sensitive to short-term climate variability. The GRACE-inferred nonlinear mass balance signal can be confirmed by independent Global Positioning System (GPS) observations, and the difference between the nonlinear vertical deformation trends estimated by GRACE and GPS, especially in ASE, is likely due to the imperfect correction of the glacial isostatic adjustment (GIA) effect. For Antarctic ice sheet as a whole, GRACE satellite gravimetry indicates an ice mass loss of −101.3 ± 18.0 Gt yr−1, with an accelerated loss of −6.4 ± 1.3 Gt yr−2 during 2002–2021. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica DML Dronning Maud Land Ice Sheet Oxford University Press Amundsen Sea Antarctic Dronning Maud Land The Antarctic Geophysical Journal International 233 2 826 838 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
SUMMARY Nonlinear trends (i.e. quadratic trends, usually defined as accelerations) in Antarctic ice mass loss due primarily to the complex climate warming forcing regimes have induced large uncertainty to future sea level projection. Here, we quantify the nonlinear and spatially varying mass losses in the Antarctic ice sheet during the last two decades using the satellite gravimetry data collected by Gravity Recovery And Climate Experiment (GRACE) and its successor GRACE Follow-On. We use a regional inversion methodology to generate the mass change time-series over Antarctica. Our findings reveal that seven regions have evidenced significant nonlinear mass change. These regions are all concentrated along the coast of Antarctica and show spatially heterogeneous mass balance nonlinear trend patterns. Among them, the Amundsen Sea Embayment (ASE) and the Dronning Maud Land (DML) are found to be particularly sensitive to short-term climate variability. The GRACE-inferred nonlinear mass balance signal can be confirmed by independent Global Positioning System (GPS) observations, and the difference between the nonlinear vertical deformation trends estimated by GRACE and GPS, especially in ASE, is likely due to the imperfect correction of the glacial isostatic adjustment (GIA) effect. For Antarctic ice sheet as a whole, GRACE satellite gravimetry indicates an ice mass loss of −101.3 ± 18.0 Gt yr−1, with an accelerated loss of −6.4 ± 1.3 Gt yr−2 during 2002–2021. |
author2 |
National Natural Science Foundation of China China Postdoctoral Science Foundation |
format |
Article in Journal/Newspaper |
author |
Jiao, Jiashuang Pan, Yuanjin Zhang, Xiaohong Shum, C K Zhang, Yu Ding, Hao |
spellingShingle |
Jiao, Jiashuang Pan, Yuanjin Zhang, Xiaohong Shum, C K Zhang, Yu Ding, Hao Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
author_facet |
Jiao, Jiashuang Pan, Yuanjin Zhang, Xiaohong Shum, C K Zhang, Yu Ding, Hao |
author_sort |
Jiao, Jiashuang |
title |
Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
title_short |
Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
title_full |
Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
title_fullStr |
Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
title_full_unstemmed |
Spatially heterogeneous nonlinear signal in Antarctic ice-sheet mass loss revealed by GRACE and GPS |
title_sort |
spatially heterogeneous nonlinear signal in antarctic ice-sheet mass loss revealed by grace and gps |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/gji/ggac485 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac485/47646752/ggac485.pdf https://academic.oup.com/gji/article-pdf/233/2/826/48517052/ggac485.pdf |
geographic |
Amundsen Sea Antarctic Dronning Maud Land The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Dronning Maud Land The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic Antarctica DML Dronning Maud Land Ice Sheet |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica DML Dronning Maud Land Ice Sheet |
op_source |
Geophysical Journal International volume 233, issue 2, page 826-838 ISSN 0956-540X 1365-246X |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/gji/ggac485 |
container_title |
Geophysical Journal International |
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233 |
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2 |
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826 |
op_container_end_page |
838 |
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1812173510882099200 |