Tuesday, April 17, 2012

New analysis finds water vapor is a negative feedback

A prior post explains in simple terms why the runaway greenhouse theory is impossible due to the negative feedback from water vapor. A new analysis by physicist Clive Best of the global 5500 station CRUTEM4 database over the past 111 years comes to the same conclusion: feedback from water vapor is negative.
"the IPCC argues that  feedbacks from increased water evaporation will lead to enhanced warming. This is not observed in those regions most effected by water vapour. In fact the opposite seems to be the case implying negative feedback."
His analysis compares the most ARID stations [low humidity/water vapor] with the most WET stations [high humidity/water vapor] and finds that
"There is a clear trend in the data that ARID stations cool faster and warm faster than  WET stations." 
"Water Feedback =  - 1.8 +- 0.2 W/m2K-1   
Remarkably this is the same value as that derived from  a simple argument regarding the Faint Sun paradox see here."


  1. That's the final nail in the coffin of AGW.
    Now it's time to convince politicians of this.

  2. http://thegwpf.org/the-climate-record/5437-richard-lindzen-response-to-the-critique-of-my-house-of-commons-lecture.html

    (3) For over thirty years, the ‘evidence’ for positive feedback has essentially been that models display it. However, numerous attempts to evaluate feedbacks independent of models have arrived at the conclusion that these feedbacks are small or even negative. In this footnote, we mention only a few of these investigations. Such studies include far more than the studies mentioned above (‘hot spot’ and the measurement of changes in outgoing radiation accompanying temperature fluctuations). They also include analyses based on the temperature time series (Schwartz et al,2010, Andronova and Schlesinger 2001) and related studies suggesting a relatively small role for greenhouse gases in the temperature record compared to the impact of various internal modes of variability and their nonlinear interactions (Tsonis et al,2007, Swanson and Tsonis,2009), calorimetric studies of the ocean-atmosphere system (Shaviv,2008, Schwartz,2012), and estimates of sensitivity based on response time (Lindzen and Giannitsis,1998, Ziskin and Shaviv,2011).

  3. http://joannenova.com.au/2012/04/last-30-years-shows-climate-feedbacks-are-zero-at-best/#more-21185