It states: > f Residence time = accumulated H2O divided by emitted H2O (days). Corresponding values for the stratosphere only are given in parenthesis. That s

It states: > f Residence time = accumulated H2O divided by emitted H2O (days). Corresponding values for the stratosphere only are given in parenthesis. That seems like it is in days. Unless there's something that I missed, I'm not seeing the part that claims water vapor lasts for years in the stratosphere.