COST-G: quality control
Ulrich Meyer
Amplitude of annual variations (SIN/COS) in the spectral and in the spatial domain
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 in Greenland
Assessment of ice mass change at the west coast of Antarctica
Amplitude of annual variations (SIN/COS) in the spectral and in the spatial domain. The monthly gravity fields are truncated at degree and order 20.
Evaluated is the time-period 2004-2010 common to all time-series.
| AC |
SIN |
COS |
SIN |
COS |
| AIUB |
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| CSR |
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| GFZ |
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| GRGS |
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| HUST |
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| IGG |
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| ITSG |
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| JPL |
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| SUS |
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| Tongji |
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| WHU |
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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 |
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| CSR |
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| GFZ |
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| GRGS |
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| HUST |
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| IGG |
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| ITSG |
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| JPL |
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| SUS |
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| Tongji |
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| WHU |
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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.
For the degree 60 combination the gravity fields with higher maximum degree were truncated at degree 60.
| AC |
degree 60 |
degree 90 |
| AIUB |
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| CSR |
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| GFZ |
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| GRGS |
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| HUST |
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| IGG |
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| ITSG |
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| JPL |
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| SUS |
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| Tongji |
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| WHU |
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COMB |
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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.
| degree 60 |
degree 90 |
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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 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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Assessment of ice mass change along the coast and on the inland ice sheet of Greenland.
Mass is derived from mean equivalent water height within the regions. A deterministic signal model including linear trend,
annual and semi-annual variations is fitted to the mass changes within the regions. No filter was applied to avoid leakage caused by the filter.
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.
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