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Figure 3: Schematic plot of stability performance of HOAPS 4.0 TCDR (CMSAF) & ICDR (C3S) minus reference sensors with corresponding target requirements.
The KPI test of ICDRs vs. TCDRs leads to similar conclusions. The ICDR differences relative to the RSS_SSMI and ERA-5 validation datasets stay in the expected range for TCDRs (Table 4). Only 5 out of 72 ICDRs show larger differences, which is expected from the 95% confidence interval. On the other hand, due to large drift between HOAPS 4.0 SSMI(S) and AIRS V7, the number of ICDR failures (K=30) exceeds the critical number of 7. Hence the ICDR differences between HOAPS & AIRS V7 do not fulfill the null hypothesis of similarity between ICDRs and TCDR. Further details can be found in the PQAD [D4] and Report on Updated KPI's [D5].
Table 4: Results of the hypothesis test upon the number of ICDRs falling outside the 95% confidence interval of the TCDR. Anchor table4 table4
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