There was little
presentation on climate sensitivity, except to mention that weak solar changes can result in a large CO2 feedback loop that can enhance temperature increases.
Not one
slide on climate sensitivity except the initial 1.5 - 4.5 range that has still not been narrowed despite 40 years of research and technological progress.
That increased atmospheric water vapor will also affect cloud cover, though impacts of changes in cloud
cover on climate sensitivity are much more uncertain.
Having better constraints on the timing and magnitude of past climate changes should ultimately lead to better
constraints on climate sensitivity and the role of natural variability in the climate system.
On the contrary, I want to separate out the
effects on climate sensitivity estimation of varying GMST responses to different forcing agents, which is what MEA15 is about, from the effects of time - varying climate sensitivity in GISS - E2 - R.
It's a critique of SPM figure 10 and uses both Hansen's
work on climate sensitivity as well as work by the Apollo - Gaia project on total Earth System sensitivity (ESS).
New paper mixing «climate feedback parameter» with climate sensitivity... «climate feedback parameter was estimated to 5.5 ± 0.6 W m − 2 K − 1» «Another issue to be considered in future work should be that the large value of the climate feedback parameter according to this work disagrees with much of the
literature on climate sensitivity (Knutti and Hegerl, 2008; Randall et al., 2007; Huber et al., 2011).
I am glad to see that my input into the Wall Street Journal op - ed pages has prompted a piece
on climate sensitivity at RealClimate.
Note that studies using radiosonde data may be affected by recently discovered inhomogeneities (Section 3.4.1.1), although Forest et al. (2006) illustrate that the impact of the radiosonde atmospheric temperature
data on their climate sensitivity estimate is smaller than that of surface and ocean warming data.
The Science Media Centre soon followed with an attempt at «expert reaction to new
report on climate sensitivity published by the Global Warming Policy Foundation `.
Overall we are closely tracking Scenario B, with Hansen's temperature predictions, based
on a climate sensitivity of 4C, running slightly hot.