ESA / ECSAT CCIWV.REP.022 Water Vapour Climate Change Initiative (WV_cci) - CCI+ Phase 2 D2.2 leads to a remarkable reduction of variation within the mean water vapour profiles in the tropopause-based coordinate. Figure 3-1: Comparison of water vapour vertical profiles relative to thermal tropopause height from different satellite instruments and in-situ observations. The satellite observations are from the period 2010 to 2012, and the JULIA and FPH/CFH data from the period 2000 to 2016. From top to bottom: DJF, MAM, JJA and SON. From left to right: 90°S–60°S, 60°S–30°S, 30°S–30°N, 30°N–60°N, and 60°N–90°N.
The water vapour mixing ratio is calculated for each 1 km altitude bin from -6 to +6 km range, with the mid- points of the altitude grid boxes at -5.5, -4.5, -3.5,…, +5.5 km, respectively. The grey and green shadings show the mean absolute deviation (MAD) of the mean mixing ratio from JULIA (black) and FPH/CFH (green), respectively. 3.2.1 Bias-correction with BBH observations The bias-correction algorithm is applied to VRWV profiles from each satellite instrument in the tropopause-based vertical coordinate. For each month and latitude band (see Figure 3-1), the 15