In this essay, Planck response means no -
feedback climate sensitivity obtained with the fixed absolute humidity.
Not exact matches
To
obtain a likelihood function by estimating the
climate feedback parameter and then to present it as a likelihood function in
climate sensitivity, a reciprocal parameter, alongside other likelihoods that may have been derived in the
sensitivity parameter space, seems to me misleading.
One empirical analysis of the type of F+G 06 does not tell that the
climate feedback parameter Y is 2.3 ± 1.4 W m ^ -2 K ^ -1 with 95 % certaintyor that the equilibrium
climate sensitivity is in the corresponding range 1.0 — 4.1 K. Those limits are
obtained only, when the additional assumption of uniform prior in Y is made.
[*] You had said: «is based purely on observational evidence, with no dependence on any
climate model simulations... to
obtain a direct measure of the overall
climate response or
feedback parameter... Measuring radiative flux imbalances provides a direct measure of Y, and hence of S, unlike other ways of diagnosing
climate sensitivity.»
Empirical assessment of fast -
feedback climate sensitivity is
obtained by comparing two quasi-equilibrium
climate states for which boundary condition
climate forcings (which may be slow
feedbacks) are known.
I am particularly grateful to Professors David Douglass and Robert Knox for having patiently answered many questions over several weeks, and for having allowed me to present a seminar on some of these ideas to a challenging audience in the Physics Faculty at Rochester University, New York; to Dr. David Evans for his assistance with temperature
feedbacks; to Professor Felix Fitzroy of the University of St. Andrews for some vigorous discussions; to Professor Larry Gould and Dr. Walter Harrison for having given me the opportunity to present some of the data and conclusions on radiative transfer and
climate sensitivity at a kindly - received public lecture at Hartford University, Connecticut; to Dr. Joanna Haigh of Imperial College, London, for having supplied a crucial piece of the argument; to Professor Richard Lindzen of the Massachusetts Institute of Technology for his lecture - notes and advice on the implications of the absence of the tropical mid-troposphere «hot - spot» for
climate sensitivity; to Dr. Willie Soon of the Harvard Center for Astrophysics for having given much useful advice and for having traced several papers that were not easily
obtained; and to Dr. Roy Spencer of the University of Alabama at Huntsville for having answered several questions in connection with satellite data.
If you wanted to
obtain the radiative forcing and no -
feedbacks climate sensitivity most relevant to the surface, which cells would you pick and why?
That's one of the many reasons why I believe that when taking the natural dynamics of the
climate — and especially water and its circulation — properly into account, we
obtain a lower result than the no - water no -
feedback sensitivity, whatever the latter exactly is.