Figure 4
From: Parameters of the Earth’s Free Core Nutation from Diurnal Strain Tides
Model parameters and siting coefficients from the inversion of the experimental tidal set. (a) Main diagonal plots show PDFs with arbitrary y-axis scale; off-diagonal scatter plots (limited to 10000 points for clarity) show correlations between parameters; the panel also includes reference parameter values, as green dashed lines in the main diagonal plots and green circles in the off-diagonal scatter plots. Red (black) lines and dots refer to \({L}^{1}\)-norm (\({L}^{2}\)-norm) inversions of tides obtained from the analysis of all strain data; blue (orange) lines refer to \({L}^{1}\)-norm (\({L}^{2}\)-norm) inversions of tides obtained from the analysis of “cleaned” strain data. Ocean loading is computed using FES2014 ocean model and cPREM Earth model. (b) PDFs of the 12 siting coefficients with arbitrary y-axis scale. (c) PDFs of model parameters (arbitrary y-axis scale) for different Earth and ocean models (see Data and Methods), \({L}^{1}\)-norm inversions of both all and “cleaned” strain data.
