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History of modifications
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Figure 3 shows the spatial variations of the standard deviation (RMS of the difference corrected by the bias) between the products. Figure 4 shows the time series of the standard deviation which has an average value of 1.8 W/m² [D5]. The standard deviation remains stable during the 2002-2018 time period but shows slightly higher values before July 2002. This is likely due to degraded CERES products before July 2002, when they can use only CERES data from the Terra satellite.
Figure 1: Mean difference between monthly mean HIRS OLR v02r07 and CERES EBAF Edition 4, over March 2000 - February 2018. Extracted from [D5].
Figure 2: Timeseries of global mean difference between monthly mean HIRS OLR v02r07 (red curve) and CERES EBAF Edition 4 over Mar 2000 - Feb 2018. Extracted from [D5]. The blue curve is for an outdated version of the HIRS OLR CDR.
Figure 3: Standard deviation (aka “bias-corrected RMS”) of the difference between monthly mean HIRS OLR v02r07 and CERES EBAF Edition 4 over Mar 2000 - Feb 2018. Extracted from [D5].
Figure 4: Timeseries of the standard deviation of the difference between monthly mean HIRS OLR v02r07 (red curve) and CERES EBAF Edition 4 over Mar 2000 - Feb 2018. Extracted from [D5]. The blue curve is for an outdated version of the HIRS OLR CDR. The spikes in the plot are related to the incomplete sampling (missing days) in the CERES observations for monthly mean derivation
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The result is shown in Figure 5. The estimated accuracies are on average: 1.6 W/m² for CM SAF and 0.9 W/m² for SYN MM (Monthly Mean) and HIRS MM. Note that those numbers are estimated over the 60°N-60°S and 60°W-60°E region and cannot be directly compared with the comparison given in section 4.1.
Figure 5: Individual accuracies of the monthly mean OLR (here called TOA Emitted Thermal TET) from CM SAF, CERES SYN and HIRS, as estimated from their RMS differences.
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