Frequency-Dependent Scaling Factors to Estimate Multiple Time-Period Global Mass Changes Observed by GRACE/GRACE-FO

IF 4.7 2区地球科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Pub Date : 2025-02-27 DOI:10.1109/JSTARS.2025.3546524

Zhenran Peng;Linsong Wang;Qing Liang;Chao Chen

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引用次数: 0

Abstract

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.

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来源期刊

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 地学-成像科学与照相技术

CiteScore

9.30

自引率

10.90%

发文量

563

审稿时长

4.7 months

期刊介绍： The IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing addresses the growing field of applications in Earth observations and remote sensing, and also provides a venue for the rapidly expanding special issues that are being sponsored by the IEEE Geosciences and Remote Sensing Society. The journal draws upon the experience of the highly successful “IEEE Transactions on Geoscience and Remote Sensing” and provide a complementary medium for the wide range of topics in applied earth observations. The ‘Applications’ areas encompasses the societal benefit areas of the Global Earth Observations Systems of Systems (GEOSS) program. Through deliberations over two years, ministers from 50 countries agreed to identify nine areas where Earth observation could positively impact the quality of life and health of their respective countries. Some of these are areas not traditionally addressed in the IEEE context. These include biodiversity, health and climate. Yet it is the skill sets of IEEE members, in areas such as observations, communications, computers, signal processing, standards and ocean engineering, that form the technical underpinnings of GEOSS. Thus, the Journal attracts a broad range of interests that serves both present members in new ways and expands the IEEE visibility into new areas.