气候变化领域集成服务门户(CCPortal): High-Resolution GRACE Monthly Spherical Harmonic Solutions

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DOI	10.1029/2019JB018892
	High-Resolution GRACE Monthly Spherical Harmonic Solutions
	Chen Q.; Shen Y.; Kusche J.; Chen W.; Chen T.; Zhang X.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	Mass transport estimates based on filtered Gravity Recovery and Climate Experiment (GRACE) monthly spherical harmonic gravity field solutions generally suffer from resolution loss and signal attenuation. To develop high-resolution solutions from GRACE Level-1B data, this study proposes a new regularization method. Transforming spatial constraints from GRACE-based filtered mass changes into the spectral domain and imposing them on spherical harmonics, we resolve high-resolution gravity field solutions expressed as spherical harmonics instead of mascons. The proposed method greatly enhances the spatial resolution and signal strength of spherical harmonic solutions. Using the presented method, we have produced a time series of high-resolution (degree 180) spherical harmonic solutions named Tongji-RegGrace2019, which can be directly used without further smoothing. To evaluate Tongji-RegGrace2019, we conduct the global (trend and annual amplitude) and regional comparisons (groundwater loss signals over India, hydrology signals over river basins, and ice melting signals over Greenland, Antarctica Peninsula and Patagonia) among various GRACE solutions. Our analyses show that Tongji-RegGrace2019 agrees well with Center for Space Research and Jet Propulsion Laboratory mascon solutions in terms of signal power and spatial resolution. Over the selected areas, the correlation coefficients of mass changes between Tongji-RegGrace2019 and mascon solutions are at least 82%. Compared to the filtered solution, higher spatial resolution and stronger signal power are achieved by Tongji-RegGrace2019 and mascon solutions, which have the potential to retrieve signals at a smaller spatial scale. Over Patagonia Icefield, the improvement of trend estimates by Tongji-RegGrace2019 with respect to the filtered solution is about 150%. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	GRACE; high-resolution monthly harmonic solutions; regularization method; satellite gravimetry
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187426
作者单位	College of Surveying and Geo-informatics, Tongji University, Shanghai, China; Institute of Geodesy and Geoinformation, University of Bonn, Bonn, Germany; Department of Land Surveying and Geo-informatics, The Hong Kong Polytechnic University, Hong Kong; Department of Surveying and Mapping, Guangdong University of Technology, Guangzhou, China
推荐引用方式 GB/T 7714	Chen Q.,Shen Y.,Kusche J.,et al. High-Resolution GRACE Monthly Spherical Harmonic Solutions[J],2021,126(1).
APA	Chen Q.,Shen Y.,Kusche J.,Chen W.,Chen T.,&Zhang X..(2021).High-Resolution GRACE Monthly Spherical Harmonic Solutions.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Chen Q.,et al."High-Resolution GRACE Monthly Spherical Harmonic Solutions".Journal of Geophysical Research: Solid Earth 126.1(2021).