I keep reading about Roy Spencer who claims the IPCC only uses positive feedback for their models:
"Cloud feedbacks are generally considered to be the most uncertain of feedbacks, although all twenty climate models tracked by the Intergovernmental Panel on Climate Change (IPCC) now suggest cloud feedbacks are positive (warmth-amplifying) rather than negative (warmth-reducing). The only question in the minds of most modelers is just how strong those positive feedbacks really are in nature. This article deals with how feedbacks are estimated from satellite observations of natural climate variability…and describes a critical error in interpretation which has been made in the process."
However, when I looked at the IPCC reports, they seem to spend a great deal of time talking about the uncertainty of cloud feedbacks and how they can be positive or negative. I found it in the 2001 report (long before Spencers published work on the subject) sections 7.2.1-7.2.2.:
I also found it in the 2007 report where it even discusses models used in the report that contain negative cloud feedbacks. See section 188.8.131.52:
If the IPCC is using models with negative cloud feedbacks, why is nobody calling Spencer on this fact (or maybe they are)? If they are only using positive cloud feedbacks, why does the report spend so much time saying that the value and the sign of the cloud feedbacks is one of the most uncertain parameters in the models?
Something to me just does not add up.
When I pointed out these discrepancies to the Roy Spencer worshipper on YA!, he only said he did not have time to look at my links and that I should watch Spencer's Youtube video, basically saying I just need to accept everything Spencer says.