COST-G: quality control
Ulrich Meyer
Significance tests for annual, semi-annual and secular variations in the spherical harmonic domain
Noise assessment in the spatial domain
Noise assessment in the spherical harmonic domain
Assessment of hydrological signal content in selected river basins
Assessment of ice mass change
Significance of annual, semi-annual and secular variations in the spherical harmonic domain.
Evaluated is the time-period 2004-2010 common to all time-series.
| AC |
trend |
annual |
semi-annual |
| AIUB-RL03p |
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| APM-SYSU |
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| CSR-RL06 |
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| GFZ-RL06 |
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| GRGS-RL04 free |
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| HUST |
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| ITSG-Grace2018 |
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| JPL-RL06 |
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| SUSTech |
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| Tongji |
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| COST-G GRACE RL02 |
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Grid-wise RMS of non-seasonal, non-secular variations. Over the oceans these variations serve to assess the noise content ot the time-series.
From all time-series a common signal model fitted to the monthly means of all time-series in the period 2004-2010 is subtracted.
All monthly gravity fields were filtered with a 400 km Gauss filter.
| AC |
geoid height |
equivalent water height |
| AIUB-RL03 |
|
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| APM-SYSU |
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| CSR-RL06 |
 |
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| GFZ-RL06 |
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| GRGS-RL04 free |
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| HUST-Grace2020 |
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| ITSG-Grace2018 |
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| JPL-RL06 |
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| SUS-RL02 |
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| Tongji |
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COST-G GRACE RL02 |
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Mean degree variances with respect to a mean signal model. The deterministic signal model including trends, annual and semi-annual variations
has been fitted to the period 2004-2010 common to all time-series. Dashed lines refer to max. order 29.
| geoid heights |
equivalent water heights |
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Assessment of hydrological signal content in selected river basins. A deterministic signal model including trends,
annual and semi-annual variations is fitted to the mean equivalent water height within the basin. All monthly gravity fields
were filtered with 400 km Gauss filter.
Comparison of estimated amplitudes of annual variations in 60 major river basins.
The formal errors of the trend estimates and the overall fit of the signal models are also provided.
Finaly the differences between the formal errors and the deviations from the mean amplitude per basin are determined to assess the
significance of the deviations.
| sorted by basin size |
sorted by annual amplitude |
assessment of significance |
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Assessment of ice mass change in Greenland and in selected glacial basins along the west coast of Antarctica.
Mass is derived from mean equivalent water height within the basins. A deterministic signal model including linear or quadratic trends,
annual and semi-annual variations is fitted to the mass changes within the basins. No filter was applied to avoid leakage caused by the filter.
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Comparison of mass trends in Greenland. The mean trend value is indicated by a black line. Differences with respect to the mean trend
and formal errors of the estimated trends are also given to assess the significance of the differences.
Comparison of mass trends in basins at the west coast of Antarctica. The mean trend value is indicated by a black line.
Differences with respect to the mean trend
and formal errors of the estimated trends are also given to assess the significance of the differences.
| Basin 11 |
Basin 12 |
Basin 13 |
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