Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry
Previous studies have shown the feasibility of point-mass modellings for deriving terrestrial water storage (TWS) from the harmonic solutions of the Gravity Recovery And Climate Experiment (GRACE) mission at regional scales (e.g., Greenland and Antarctica). However, a thorough assessment of point-ma...
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ftdatacite:10.48350/166387 2023-05-15T14:05:04+02:00 Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry Yang, Yanan Ferreira, Vagner Seitz, Kurt Grombein, Thomas Yong, Bin Heck, Bernhard 2022 https://dx.doi.org/10.48350/166387 https://boris.unibe.ch/166387/ unknown Springer https://dx.doi.org/10.1007/s40328-021-00369-x restricted access publisher holds copyright http://purl.org/coar/access_right/c_16ec 520 Astronomy article-journal ScholarlyArticle journal article Text 2022 ftdatacite https://doi.org/10.48350/166387 https://doi.org/10.1007/s40328-021-00369-x 2022-04-01T12:44:52Z Previous studies have shown the feasibility of point-mass modellings for deriving terrestrial water storage (TWS) from the harmonic solutions of the Gravity Recovery And Climate Experiment (GRACE) mission at regional scales (e.g., Greenland and Antarctica). However, a thorough assessment of point-mass modelling approaches at the global and river basin levels is still necessary. Therefore, this study’s objective is to assess the implementation and performance of the point-mass modelling approaches based on simulations using as inputs the TWS from Global Land Data Assimilation System (GLDAS). First, the approximate solutions of Newton’s integral using the Taylor series expansion, such that the zeroth-order approximation is equivalent to the “original point-mass” (OPM) and the third-order approximation to the “improved point-mass” (IPM) modellings are presented. Second, numerical comparisons of the gravitational potential forwarded by the IPM and OPM are carried out at which both approaches show errors smaller than the GRACE uncertainties for the potential differences (∼7.6×10−4 m2/s2). Nevertheless, the spatial patterns of the OPM’s errors still assemble the TWS’s spatial variations. Finally, simulations showed that considering OPM’s deviations from IPM improves the root-mean-square-difference (RMSD) of the inverted TWS up to 50% at the global and basin scales if the edge effects are neglected. After accounting for the edge effects, the IPM solution presented an RMSD of 6.44 mm with an enhancement of about only 20% regarding the OPM. Although the present study confirms the suitability of point-mass approaches for recovering TWS, further investigations regarding its advantages compared to GRACE spherical harmonic synthesis are still necessary. Text Antarc* Antarctica Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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520 Astronomy |
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520 Astronomy Yang, Yanan Ferreira, Vagner Seitz, Kurt Grombein, Thomas Yong, Bin Heck, Bernhard Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
topic_facet |
520 Astronomy |
description |
Previous studies have shown the feasibility of point-mass modellings for deriving terrestrial water storage (TWS) from the harmonic solutions of the Gravity Recovery And Climate Experiment (GRACE) mission at regional scales (e.g., Greenland and Antarctica). However, a thorough assessment of point-mass modelling approaches at the global and river basin levels is still necessary. Therefore, this study’s objective is to assess the implementation and performance of the point-mass modelling approaches based on simulations using as inputs the TWS from Global Land Data Assimilation System (GLDAS). First, the approximate solutions of Newton’s integral using the Taylor series expansion, such that the zeroth-order approximation is equivalent to the “original point-mass” (OPM) and the third-order approximation to the “improved point-mass” (IPM) modellings are presented. Second, numerical comparisons of the gravitational potential forwarded by the IPM and OPM are carried out at which both approaches show errors smaller than the GRACE uncertainties for the potential differences (∼7.6×10−4 m2/s2). Nevertheless, the spatial patterns of the OPM’s errors still assemble the TWS’s spatial variations. Finally, simulations showed that considering OPM’s deviations from IPM improves the root-mean-square-difference (RMSD) of the inverted TWS up to 50% at the global and basin scales if the edge effects are neglected. After accounting for the edge effects, the IPM solution presented an RMSD of 6.44 mm with an enhancement of about only 20% regarding the OPM. Although the present study confirms the suitability of point-mass approaches for recovering TWS, further investigations regarding its advantages compared to GRACE spherical harmonic synthesis are still necessary. |
format |
Text |
author |
Yang, Yanan Ferreira, Vagner Seitz, Kurt Grombein, Thomas Yong, Bin Heck, Bernhard |
author_facet |
Yang, Yanan Ferreira, Vagner Seitz, Kurt Grombein, Thomas Yong, Bin Heck, Bernhard |
author_sort |
Yang, Yanan |
title |
Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
title_short |
Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
title_full |
Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
title_fullStr |
Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
title_full_unstemmed |
Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
title_sort |
assessment of point-mass solutions for recovering water mass variations from satellite gravimetry |
publisher |
Springer |
publishDate |
2022 |
url |
https://dx.doi.org/10.48350/166387 https://boris.unibe.ch/166387/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_relation |
https://dx.doi.org/10.1007/s40328-021-00369-x |
op_rights |
restricted access publisher holds copyright http://purl.org/coar/access_right/c_16ec |
op_doi |
https://doi.org/10.48350/166387 https://doi.org/10.1007/s40328-021-00369-x |
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1766276706331525120 |