I'm a skeptic and I'd like..... Feb 6, 2009 19:07:08 GMT
Post by jorgekafkazar on Feb 6, 2009 19:07:08 GMT
It's very likely that the effect of clouds depends on atmospheric temperature, down to "snowball Earth" levels.
One thing that water vapor does a very effective job of is raising heat up into the atmosphere. This is done by transporting water from surface level, where heat is added to form vapor, up into the atmosphere, where heat is lost to form rain. As people have pointed out before, CO2 IR absorption is saturated at low altitudes, but at higher altitudes, where the atmosphere is thinner, IR absorption is lower, giving IR an easier path to space.
Where moderation comes into effect has to do with relative humidity and the affect of atmospheric temperature on the ability of the atmosphere to hold water. The absolute humidity increases exponentially with temperature for a constant relative humidity. What that means is that as temperature rises, the ability of moisture to stay in the air during overnight low temperatures decreases. And that means that as the temperature rises, more heat is raised into the atmosphere where it has a better chance of radiating out to space as latent heat of evaporation.
And THAT is why I keep telling the warmies that "Climate Change" is a better name than "Global Warming". Doesn't mean AGW isn't going to happen, just that it will look a lot more like chaotic weather (which we are seeing) than monotonic rises in annual temperature (which we aren't seeing).
Interesting post. Would you say that chaotic temperature patterns are better able to shed heat than monotonic ones?