10.18419/darus-807
Yi, Shuang0000-0003-2976-2351(Universität Stuttgart)Sneeuw, Nico0000-0003-1796-0131(Universität Stuttgart)
Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysis
DaRUS
2021
doi:10.18419/darus-807/1doi:10.18419/darus-807/2doi:10.18419/darus-807/3doi:10.18419/darus-807/4doi:10.18419/darus-807/5doi:10.18419/darus-807/6doi:10.18419/darus-807/7doi:10.18419/darus-807/8doi:10.18419/darus-807/9doi:10.18419/darus-807/10doi:10.18419/darus-807/11doi:10.18419/darus-807/12doi:10.18419/darus-807/13doi:10.18419/darus-807/14doi:10.18419/darus-807/15doi:10.18419/darus-807/16doi:10.18419/darus-807/17doi:10.18419/darus-807/18doi:10.18419/darus-807/19doi:10.18419/darus-807/20doi:10.18419/darus-807/21doi:10.18419/darus-807/22doi:10.18419/darus-807/23doi:10.18419/darus-807/24doi:10.18419/darus-807/25doi:10.18419/darus-807/26doi:10.18419/darus-807/27doi:10.18419/darus-807/28doi:10.18419/darus-807/29doi:10.18419/darus-807/30doi:10.18419/darus-807/31doi:10.18419/darus-807/32doi:10.18419/darus-807/33doi:10.18419/darus-807/34doi:10.18419/darus-807/35doi:10.18419/darus-807/36doi:10.18419/darus-807/37doi:10.18419/darus-807/38doi:10.18419/darus-807/39doi:10.18419/darus-807/40doi:10.18419/darus-807/41doi:10.18419/darus-807/42doi:10.18419/darus-807/43
Dozens of missing epochs in the monthly gravity product of the satellite mission Gravity Recovery and Climate Experiment (GRACE) and its follow-on (GRACE-FO) mission greatly inhibit the complete analysis and full utilization of the data. Despite previous attempts to handle this problem, a general all-purpose gap-filling solution is still lacking. Here we propose a non-parametric, data-adaptive and easy-to-implement approach - composed of the Singular Spectrum Analysis (SSA) gap-filling technique, cross-validation, and spectral testing for significant components - to produce reasonable gap-filling results in the form of spherical harmonic coefficients (SHCs). We demonstrate that this approach is adept at inferring missing data from long-term and oscillatory changes extracted from available observations. A comparison in the spectral domain reveals that the gap-filling result resembles the product of GRACE missions below spherical harmonic degree 30 very well. As the degree increases above 30, the amplitude per degree of the gap-filling result decreases more rapidly than that of GRACE/GRACE-FO SHCs, showing effective suppression of noise. As a result, our approach can reduce noise in the oceans without sacrificing resolutions on land. The gap filling dataset is stored in the “SSA_filing/" folder. Each file represents a monthly result in the form of spherical harmonics. The data format follows the convention of the site ftp://isdcftp.gfz-potsdam.de/grace/. Low degree corrections (degree-1, C20, C30) have been made. The code to generate the dataset is located in the “code_share/“ folder, with an example for C30. The model-based Greenland mass balance result for data validation (results given in the paper) is provided in the "Greenland_SMB-D.txt” file.
Yi, Shuang(Universität Stuttgart)