A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets
Many recent mass balance estimates using the Gravity Recovery and Climate Experiment (GRACE) and satellite altimetry (including two kinds of sensors of radar and laser) show that the ice mass of the Antarctic ice sheet (AIS) is in overall decline. However, there are still large differences among pre...
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ftdoajarticles:oai:doaj.org/article:4775579a88a2433699c58b029d1970c4 2023-05-15T13:24:19+02:00 A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets Chunchun Gao Yang Lu Zizhan Zhang Hongling Shi 2019-03-01T00:00:00Z https://doi.org/10.3390/rs11060653 https://doaj.org/article/4775579a88a2433699c58b029d1970c4 EN eng MDPI AG http://www.mdpi.com/2072-4292/11/6/653 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11060653 https://doaj.org/article/4775579a88a2433699c58b029d1970c4 Remote Sensing, Vol 11, Iss 6, p 653 (2019) Antarctic ice sheet mass balance glacial isostatic adjustment (GIA) joint inversion estimate Gravity Recovery and Climate Experiment (GRACE) Ice Cloud and land Elevation Satellite (ICESat) Global Positioning System (GPS) Science Q article 2019 ftdoajarticles https://doi.org/10.3390/rs11060653 2022-12-31T11:23:31Z Many recent mass balance estimates using the Gravity Recovery and Climate Experiment (GRACE) and satellite altimetry (including two kinds of sensors of radar and laser) show that the ice mass of the Antarctic ice sheet (AIS) is in overall decline. However, there are still large differences among previously published estimates of the total mass change, even in the same observed periods. The considerable error sources mainly arise from the forward models (e.g., glacial isostatic adjustment [GIA] and firn compaction) that may be uncertain but indispensable to simulate some processes not directly measured or obtained by these observations. To minimize the use of these forward models, we estimate the mass change of ice sheet and present-day GIA using multi-geodetic observations, including GRACE and Ice, Cloud and land Elevation Satellite (ICESat), as well as Global Positioning System (GPS), by an improved method of joint inversion estimate (JIE), which enables us to solve simultaneously for the Antarctic GIA and ice mass trends. The GIA uplift rates generated from our JIE method show a good agreement with the elastic-corrected GPS uplift rates, and the total GIA-induced mass change estimate for the AIS is 54 ± 27 Gt/yr, which is in line with many recent GPS calibrated GIA estimates. Our GIA result displays the presence of significant uplift rates in the Amundsen Sea Embayment of West Antarctica, where strong uplift has been observed by GPS. Over the period February 2003 to October 2009, the entire AIS changed in mass by −84 ± 31 Gt/yr (West Antarctica: −69 ± 24, East Antarctica: 12 ± 16 and the Antarctic Peninsula: −27 ± 8), greater than the GRACE-only estimates obtained from three Mascon solutions (CSR: −50 ± 30, JPL: −71 ± 30, and GSFC: −51 ± 33 Gt/yr) for the same period. This may imply that single GRACE data tend to underestimate ice mass loss due to the signal leakage and attenuation errors of ice discharge are often worse than that of surface mass balance over the AIS. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet West Antarctica Directory of Open Access Journals: DOAJ Articles Amundsen Sea Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica Remote Sensing 11 6 653 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic ice sheet mass balance glacial isostatic adjustment (GIA) joint inversion estimate Gravity Recovery and Climate Experiment (GRACE) Ice Cloud and land Elevation Satellite (ICESat) Global Positioning System (GPS) Science Q |
spellingShingle |
Antarctic ice sheet mass balance glacial isostatic adjustment (GIA) joint inversion estimate Gravity Recovery and Climate Experiment (GRACE) Ice Cloud and land Elevation Satellite (ICESat) Global Positioning System (GPS) Science Q Chunchun Gao Yang Lu Zizhan Zhang Hongling Shi A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
topic_facet |
Antarctic ice sheet mass balance glacial isostatic adjustment (GIA) joint inversion estimate Gravity Recovery and Climate Experiment (GRACE) Ice Cloud and land Elevation Satellite (ICESat) Global Positioning System (GPS) Science Q |
description |
Many recent mass balance estimates using the Gravity Recovery and Climate Experiment (GRACE) and satellite altimetry (including two kinds of sensors of radar and laser) show that the ice mass of the Antarctic ice sheet (AIS) is in overall decline. However, there are still large differences among previously published estimates of the total mass change, even in the same observed periods. The considerable error sources mainly arise from the forward models (e.g., glacial isostatic adjustment [GIA] and firn compaction) that may be uncertain but indispensable to simulate some processes not directly measured or obtained by these observations. To minimize the use of these forward models, we estimate the mass change of ice sheet and present-day GIA using multi-geodetic observations, including GRACE and Ice, Cloud and land Elevation Satellite (ICESat), as well as Global Positioning System (GPS), by an improved method of joint inversion estimate (JIE), which enables us to solve simultaneously for the Antarctic GIA and ice mass trends. The GIA uplift rates generated from our JIE method show a good agreement with the elastic-corrected GPS uplift rates, and the total GIA-induced mass change estimate for the AIS is 54 ± 27 Gt/yr, which is in line with many recent GPS calibrated GIA estimates. Our GIA result displays the presence of significant uplift rates in the Amundsen Sea Embayment of West Antarctica, where strong uplift has been observed by GPS. Over the period February 2003 to October 2009, the entire AIS changed in mass by −84 ± 31 Gt/yr (West Antarctica: −69 ± 24, East Antarctica: 12 ± 16 and the Antarctic Peninsula: −27 ± 8), greater than the GRACE-only estimates obtained from three Mascon solutions (CSR: −50 ± 30, JPL: −71 ± 30, and GSFC: −51 ± 33 Gt/yr) for the same period. This may imply that single GRACE data tend to underestimate ice mass loss due to the signal leakage and attenuation errors of ice discharge are often worse than that of surface mass balance over the AIS. |
format |
Article in Journal/Newspaper |
author |
Chunchun Gao Yang Lu Zizhan Zhang Hongling Shi |
author_facet |
Chunchun Gao Yang Lu Zizhan Zhang Hongling Shi |
author_sort |
Chunchun Gao |
title |
A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
title_short |
A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
title_full |
A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
title_fullStr |
A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
title_full_unstemmed |
A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets |
title_sort |
joint inversion estimate of antarctic ice sheet mass balance using multi-geodetic data sets |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/rs11060653 https://doaj.org/article/4775579a88a2433699c58b029d1970c4 |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet West Antarctica |
op_source |
Remote Sensing, Vol 11, Iss 6, p 653 (2019) |
op_relation |
http://www.mdpi.com/2072-4292/11/6/653 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11060653 https://doaj.org/article/4775579a88a2433699c58b029d1970c4 |
op_doi |
https://doi.org/10.3390/rs11060653 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
6 |
container_start_page |
653 |
_version_ |
1766378745195659264 |