Water Vapour Feedback

Dr. Roy Spencer points out that negative water vapour feedback could still occur even with a water vapour increase:

“Most atmospheric water vapor resides in the lowest levels, in the ‘turbulent boundary layer’, while the water vapor content of the free troposphere is more closely tied to precipitation processes. But because the outgoing longwave radiation is so much more sensitive to small changes in upper-layer humidity especially at low humidities (e.g. see Spencer & Braswell, 1997), it is possible to have a net increase in total integrated water vapor, but negative water vapor feedback from a small decrease in free-tropospheric humidity. See #4 (below) for observational support for this possibility.”

‘Evaporation-precipitation’
http://www.drroyspencer.com/wp-content/uploads/evaporation-precipitation1.jpg

‘Five Reasons Why Water Vapour Feedback Might Not Be Positive’
http://www.drroyspencer.com/2010/09/five-reasons-why-water-vapor-feedback-might-not-be-positive/

17 September, 2010

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