Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysisdoi:10.18419/darus-807DaRUS2021-05-141Yi, 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, V1Data for: Filling the data gaps within GRACE missions using Singular Spectrum Analysisdoi:10.18419/darus-807Yi, ShuangSneeuw, NicoDaRUSYi, ShuangSchlesinger, Ron2020-05-12Earth and Environmental SciencesGRACEsatellite gravimetrydata gapSSAgap fillingDozens 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.Shuang Yi, Nico Sneeuw. "Filling the data gaps within GRACE missions using Singular Spectrum Analysis". Journal of Geophysical Research: Solid earth, 126, e2020JB02122710.1029/2020JB021227Shuang Yi, Nico Sneeuw. "Filling the data gaps within GRACE missions using Singular Spectrum Analysis". Journal of Geophysical Research: Solid earth, 126, e2020JB021227Greenland_SMB-D.txttext/plainexample_C30.matapplication/matlab-matfun_SSA_filling_a.mtext/x-matlabfun_SSA_filling_b.mtext/x-matlabmain_SSA_gap_filling.mtext/plainreadme.txttext/plainssa_missing_iterative.mtext/x-matlabuniform_time.mtext/x-matlabSSA_filling_a_CSR06_GSM_200206-1.txttext/plainSSA_filling_a_CSR06_GSM_200207-1.txttext/plainSSA_filling_a_CSR06_GSM_200306-1.txttext/plainSSA_filling_a_CSR06_GSM_201101-1.txttext/plainSSA_filling_a_CSR06_GSM_201106-1.txttext/plainSSA_filling_a_CSR06_GSM_201111-1.txttext/plainSSA_filling_a_CSR06_GSM_201205-1.txttext/plainSSA_filling_a_CSR06_GSM_201210-1.txttext/plainSSA_filling_a_CSR06_GSM_201303-1.txttext/plainSSA_filling_a_CSR06_GSM_201308-1.txttext/plainSSA_filling_a_CSR06_GSM_201309-1.txttext/plainSSA_filling_a_CSR06_GSM_201402-1.txttext/plainSSA_filling_a_CSR06_GSM_201407-1.txttext/plainSSA_filling_a_CSR06_GSM_201412-1.txttext/plainSSA_filling_a_CSR06_GSM_201505-1.txttext/plainSSA_filling_a_CSR06_GSM_201506-1.txttext/plainSSA_filling_a_CSR06_GSM_201510-1.txttext/plainSSA_filling_a_CSR06_GSM_201511-1.txttext/plainSSA_filling_a_CSR06_GSM_201604-1.txttext/plainSSA_filling_a_CSR06_GSM_201609-1.txttext/plainSSA_filling_a_CSR06_GSM_201610-1.txttext/plainSSA_filling_a_CSR06_GSM_201702-1.txttext/plainSSA_filling_b_CSR06_GSM_201707-1.txttext/plainSSA_filling_b_CSR06_GSM_201708-1.txttext/plainSSA_filling_b_CSR06_GSM_201709-1.txttext/plainSSA_filling_b_CSR06_GSM_201710-1.txttext/plainSSA_filling_b_CSR06_GSM_201711-1.txttext/plainSSA_filling_b_CSR06_GSM_201712-1.txttext/plainSSA_filling_b_CSR06_GSM_201801-1.txttext/plainSSA_filling_b_CSR06_GSM_201802-1.txttext/plainSSA_filling_b_CSR06_GSM_201803-1.txttext/plainSSA_filling_b_CSR06_GSM_201804-1.txttext/plainSSA_filling_b_CSR06_GSM_201805-1.txttext/plainSSA_filling_b_CSR06_GSM_201808-1.txttext/plainSSA_filling_b_CSR06_GSM_201809-1.txttext/plain