Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica
In the so-called point-mass modeling, surface densities are represented by point masses, providing only an approximated solution of the surface integral for the gravitational potential. Here, we propose a refinement for the point-mass modeling based on Taylor series expansion in which the zeroth-ord...
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ftdatacite:10.5445/ir/1000129597 2023-05-15T13:54:59+02:00 Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica Ferreira, Vagner G. Yong, Bin Seitz, Kurt Heck, Bernhard Grombein, Thomas 2020 PDF https://dx.doi.org/10.5445/ir/1000129597 https://publikationen.bibliothek.kit.edu/1000129597 en eng MDPI Creative Commons Namensnennung 4.0 International Open Access info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/deed.de CC-BY GRACE mascon mass loss point-mass modeling regional inversion Text article-journal Journal Article ScholarlyArticle 2020 ftdatacite https://doi.org/10.5445/ir/1000129597 2021-11-05T12:55:41Z In the so-called point-mass modeling, surface densities are represented by point masses, providing only an approximated solution of the surface integral for the gravitational potential. Here, we propose a refinement for the point-mass modeling based on Taylor series expansion in which the zeroth-order approximation is equivalent to the point-mass solution. Simulations show that adding higher-order terms neglected in the point-mass modeling reduces the error of inverted mass changes of up to 90% on global and Antarctica scales. The method provides an alternative to the processing of the Level-2 data from the Gravity Recovery and Climate Experiment (GRACE) mission. While the evaluation of the surface densities based on improved point-mass modeling using ITSG-Grace2018 Level-2 data as observations reveals noise level of approximately 5.77 mm, this figure is 5.02, 6.05, and 5.81 mm for Center for Space Research (CSR), Goddard Space Flight Center (GSFC), and Jet Propulsion Laboratory (JPL) mascon solutions, respectively. Statistical tests demonstrate that the four solutions are not significant different (95% confidence) over Antarctica Ice Sheet (AIS), despite the slight differences seen in the noises. Therefore, the estimated noise level for the four solutions indicates the quality of GRACE mass changes over AIS. Overall, AIS shows a mass loss of −7.58 mm/year during 2003–2015 based on the improved point-mass solution, which agrees with the values derived from mascon solutions. Text Antarc* Antarctica Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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language |
English |
topic |
GRACE mascon mass loss point-mass modeling regional inversion |
spellingShingle |
GRACE mascon mass loss point-mass modeling regional inversion Ferreira, Vagner G. Yong, Bin Seitz, Kurt Heck, Bernhard Grombein, Thomas Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
topic_facet |
GRACE mascon mass loss point-mass modeling regional inversion |
description |
In the so-called point-mass modeling, surface densities are represented by point masses, providing only an approximated solution of the surface integral for the gravitational potential. Here, we propose a refinement for the point-mass modeling based on Taylor series expansion in which the zeroth-order approximation is equivalent to the point-mass solution. Simulations show that adding higher-order terms neglected in the point-mass modeling reduces the error of inverted mass changes of up to 90% on global and Antarctica scales. The method provides an alternative to the processing of the Level-2 data from the Gravity Recovery and Climate Experiment (GRACE) mission. While the evaluation of the surface densities based on improved point-mass modeling using ITSG-Grace2018 Level-2 data as observations reveals noise level of approximately 5.77 mm, this figure is 5.02, 6.05, and 5.81 mm for Center for Space Research (CSR), Goddard Space Flight Center (GSFC), and Jet Propulsion Laboratory (JPL) mascon solutions, respectively. Statistical tests demonstrate that the four solutions are not significant different (95% confidence) over Antarctica Ice Sheet (AIS), despite the slight differences seen in the noises. Therefore, the estimated noise level for the four solutions indicates the quality of GRACE mass changes over AIS. Overall, AIS shows a mass loss of −7.58 mm/year during 2003–2015 based on the improved point-mass solution, which agrees with the values derived from mascon solutions. |
format |
Text |
author |
Ferreira, Vagner G. Yong, Bin Seitz, Kurt Heck, Bernhard Grombein, Thomas |
author_facet |
Ferreira, Vagner G. Yong, Bin Seitz, Kurt Heck, Bernhard Grombein, Thomas |
author_sort |
Ferreira, Vagner G. |
title |
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
title_short |
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
title_full |
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
title_fullStr |
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
title_full_unstemmed |
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica |
title_sort |
introducing an improved grace global point-mass solution—a case study in antarctica |
publisher |
MDPI |
publishDate |
2020 |
url |
https://dx.doi.org/10.5445/ir/1000129597 https://publikationen.bibliothek.kit.edu/1000129597 |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_rights |
Creative Commons Namensnennung 4.0 International Open Access info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/deed.de |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5445/ir/1000129597 |
_version_ |
1766261186033090560 |