ESA / ECSAT CCIWV.REP.022 Water Vapour Climate Change Initiative (WV_cci) - CCI+ Phase 2 D2.2 7.5 MIM HALOE SAGE II SAGE III SAGE III ISS UARS-MLS Aura-MLS POAM III MIPAS(1) MIPAS(2) ACE-FTS MAESTRO SCIAMACHY SMR(1) SMR(2) H 2 O [ppmv] 7.0 a) 6.5 6.0 5.5 5.0 H 2 O-corrected [ppmv] Diff H 2 O (obs-CMAM20) [ppmv] bias-corrected with bias 0.0 0.5 1.0 1.5 b) 0.5 1.0 c) 0.0 -0.5 7.5 7.0 d) 6.5 6.0 5.5 5.0 Jan 85 Jan 90 Jan 95 Jan 00 Jan 05 Jan 10 Jan 15 Jan 20 Figure 2-2: Steps involved in the merging algorithm of CDR-3. (a) The water vapour time series of the different instruments are given in colours (see legend), the CCM in grey. (b) Instrumental differences to the CCM, here CMAM is used.
(c) Bias-corrected instrument offsets. (d) Bias-corrected instrument time series and final merged dataset (black line with red diamonds) transferred back to the instrumental reference (average of Aura-MLS, ACE-FTS, and MIPAS). 11