Science Forums 2

[Turtle]

Originally Posted by Chris C

A few points--

turtle,

Global Warming by definition is just ΔT, not absolute T, so you need to look at drivers of climate change which can initiate a change from state 1 to state 2, and water vapor cannot do that.

Acknowledged; thanks Chris. The realclimate article concludes with this:

Originally Posted by realclimate

To be sure there are still some lingering uncertainties. Some recent data indicates that tropical upper tropopsheric water vapour does not quite keep up with constant relative humidity (Minschwaner and Dessler, 2004) (though they still found that the feedback was positive). Moist convection schemes in models are constantly being refined, and it's possible that newer schemes will change things . However, given the Pinatubo results, the models are probably getting the broader picture reasonably correct. ...

RealClimate » Water vapour: feedback or forcing?

The devil is always in the details. So if a single above water volcano can rock the boat so noticeably, I have to wonder how the underwater volcanoes roll it.