ESA / ECSAT CCIWV.REP.022 Water Vapour Climate Change Initiative (WV_cci) - CCI+ Phase 2 D2.2 variations. Meanwhile, a smoothing process is applied to VRWV profiles across the 300- hPa level for IMS based on a window function, here using the Blackman window. The smooth processing reduces the sharp discontinuity at 300 hPa between original and bias-correction profiles. To obtain a harmonised and continuous WV data in the vertical, the bias-correction for and merging process of satellite VRWV profiles should be performed throughout the UTLS and troposphere in the future. 22