Hi I was wondering if anyone knows about how molecules are distributed throughout various layers of the atmosphere. My assumption is that most molecules would be more abundant in the troposphere and decrease throughout until the mesosphere. does anyone know a little more about this or any links I can't seem to find what I'm looking for on the net. Im interested in the greenhouse gas molecules (CO2, H2O, CH4, N2O) how are they distributed throughout the various layers? I know water vapour is more abundant near water obviously but I'm more concerned with longitudinal ratios etc. again any links would be great because I have to reference it, and ratios between each layer would be good thanks.