Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO
The scaling factor method is commonly used to restore near-true time-variable gravity from gravity recovery and climate experiment/follow-on (GRACE/GRACE-FO). This study presents a novel method for computing frequency-dependent scaling factors (FDSFs) using spherical harmonic decomposition of GRACE/...
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10906428/ |
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| author | Zhenran Peng Linsong Wang Qing Liang Chao Chen |
| author_facet | Zhenran Peng Linsong Wang Qing Liang Chao Chen |
| author_sort | Zhenran Peng |
| collection | DOAJ |
| description | The scaling factor method is commonly used to restore near-true time-variable gravity from gravity recovery and climate experiment/follow-on (GRACE/GRACE-FO). This study presents a novel method for computing frequency-dependent scaling factors (FDSFs) using spherical harmonic decomposition of GRACE/GRACE-FO Level-2 data at full frequency. Two applications based on a global hydrological model (land excluding Greenland and Antarctica) and a combined model (Greenland) demonstrate that FDSFs reduce the theoretical recovery residuals versus using a single scaling factor by ∼11.0% across short-term, seasonal, inter-annual, and long-term scales. Given the ability to capture more model details, the FDSFs improved the estimates at the basin scale and in glacier regions such as High Mountain Asia. In Greenland, the FDSF-scaled results revealed an enhanced amplitude with an averaged relative increase of 38% and improved resolution to 0.5 degrees below 1500 m, compared with the GRACE Level-3 mascon solution. Our results also imply that using FDSFs would cause uncertainties, particularly in scaled short-term mass change, which could be attributed to the large discrepancy between the hydrological model and GRACE/GRACE-FO. Our study provides insights into estimating mass changes using a downscaled GRACE/GRACE-FO solution and suggests that users select FDSFs for regions of interest based on a reliable model. |
| format | Article |
| id | doaj-art-be9a72b41e1549368f80fa44a93721eb |
| institution | OA Journals |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-be9a72b41e1549368f80fa44a93721eb2025-08-20T02:09:51ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-01188025803910.1109/JSTARS.2025.354652410906428Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FOZhenran Peng0Linsong Wang1https://orcid.org/0000-0002-3980-479XQing Liang2Chao Chen3Hubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan, ChinaThe scaling factor method is commonly used to restore near-true time-variable gravity from gravity recovery and climate experiment/follow-on (GRACE/GRACE-FO). This study presents a novel method for computing frequency-dependent scaling factors (FDSFs) using spherical harmonic decomposition of GRACE/GRACE-FO Level-2 data at full frequency. Two applications based on a global hydrological model (land excluding Greenland and Antarctica) and a combined model (Greenland) demonstrate that FDSFs reduce the theoretical recovery residuals versus using a single scaling factor by ∼11.0% across short-term, seasonal, inter-annual, and long-term scales. Given the ability to capture more model details, the FDSFs improved the estimates at the basin scale and in glacier regions such as High Mountain Asia. In Greenland, the FDSF-scaled results revealed an enhanced amplitude with an averaged relative increase of 38% and improved resolution to 0.5 degrees below 1500 m, compared with the GRACE Level-3 mascon solution. Our results also imply that using FDSFs would cause uncertainties, particularly in scaled short-term mass change, which could be attributed to the large discrepancy between the hydrological model and GRACE/GRACE-FO. Our study provides insights into estimating mass changes using a downscaled GRACE/GRACE-FO solution and suggests that users select FDSFs for regions of interest based on a reliable model.https://ieeexplore.ieee.org/document/10906428/Global mass changesgravity recovery and climate experiment/follow-on (GRACE/GRACE-FO)multiple time scalesatellite gravityscaling factor (SF) |
| spellingShingle | Zhenran Peng Linsong Wang Qing Liang Chao Chen Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Global mass changes gravity recovery and climate experiment/follow-on (GRACE/GRACE-FO) multiple time scale satellite gravity scaling factor (SF) |
| title | Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO |
| title_full | Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO |
| title_fullStr | Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO |
| title_full_unstemmed | Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO |
| title_short | Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO |
| title_sort | frequency dependent scaling factors to estimate multiple time period global mass changes observed by grace grace fo |
| topic | Global mass changes gravity recovery and climate experiment/follow-on (GRACE/GRACE-FO) multiple time scale satellite gravity scaling factor (SF) |
| url | https://ieeexplore.ieee.org/document/10906428/ |
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