This of course implies relatively constant relative humidity is therefore a big part in the water - vapour feedback. (realclimate.org)
The observed regional changes are consistent in pattern and amount with the changes in SST and the assumption of a near - constant relative humidity increase in water vapour mixing ratio. (ipcc.ch)
Actual physical observations have shown that net cloud feedback is very likely to be negative rather than strongly positive and that the net water vapor plus lapse rate feedback is around half of the amount estimated with assumed constant relative humidity. (judithcurry.com)