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Part 1: Document Description
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Title: |
Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysis |
Identification Number: |
doi:10.18419/darus-807 |
Distributor: |
DaRUS |
Date of Distribution: |
2021-05-14 |
Version: |
1 |
Bibliographic Citation: |
Yi, Shuang; Sneeuw, Nico, 2021, "Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysis", https://doi.org/10.18419/darus-807, DaRUS, V1 |
Citation |
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Title: |
Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysis |
Identification Number: |
doi:10.18419/darus-807 |
Authoring Entity: |
Yi, Shuang (Universität Stuttgart) |
Sneeuw, Nico (Universität Stuttgart) |
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Distributor: |
DaRUS |
Access Authority: |
Yi, Shuang |
Depositor: |
Schlesinger, Ron |
Date of Deposit: |
2020-05-12 |
Holdings Information: |
https://doi.org/10.18419/darus-807 |
Study Scope |
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Keywords: |
Earth and Environmental Sciences, GRACE, satellite gravimetry, data gap, SSA, gap filling |
Abstract: |
Dozens of missing epochs in the monthly gravity product of the satellite mission Gravity Recovery and Climate Experiment (<a href="https://earth.gsfc.nasa.gov/geo/missions/grace">GRACE</a>) and its follow-on (<a href="https://gracefo.jpl.nasa.gov/">GRACE-FO</a>) 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. <br /> 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. <br /> The code to generate the dataset is located in the “code_share/“ folder, with an example for C30. <br /> The model-based Greenland mass balance result for data validation (results given in the paper) is provided in the "Greenland_SMB-D.txt” file. |
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Related Publications |
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Citation |
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Title: |
Shuang Yi, Nico Sneeuw. "Filling the data gaps within GRACE missions using Singular Spectrum Analysis". Journal of Geophysical Research: Solid earth, 126, e2020JB021227 |
Identification Number: |
10.1029/2020JB021227 |
Bibliographic Citation: |
Shuang Yi, Nico Sneeuw. "Filling the data gaps within GRACE missions using Singular Spectrum Analysis". Journal of Geophysical Research: Solid earth, 126, e2020JB021227 |
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Greenland_SMB-D.txt |
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