A proposition of this type is a premise to the IPCC's argument for the possibility of a catastrophically
high equilibrium climate sensitivity (ECS) and this argument must be regarded as unproved in view of the falsity of this premise.
Then, you would have the global climate models that offer
a higher equilibrium climate sensitivity and longer time constants.
Not exact matches
Beyond
equilibrium climate sensitivity -LSB-...] Newer metrics relating global warming directly to the total emitted CO2 show that in order to keep warming to within 2 °C, future CO2 emissions have to remain strongly limited, irrespective of
climate sensitivity being at the
high or low end.»
Moreover, the timeframe over which the planet comes to
equilibrium increases with
higher climate sensitivity.
Then on page 9.5 we read «There is very
high confidence that the primary factor contributing to the spread in
equilibrium climate sensitivity continues to be the cloud feedback.
Aslo, regarding
climate sensitivity a very key thing to remember, especially if
sensitivity turns out to be on the
high side, is that the «final»
equilibrium temperature (Alexi's concerns about there being such a thing aside) calculated from
climate sensitivity does not take into account carbon cycle feedbacks OR ice sheet changes.
Annan said
equilibrium climate sensitivity is unlikely to be
higher than 4.5 °C — there are few if any mainstream
climate scientists who would disagree with this.
This
sensitivity is often represented by the
equilibrium climate sensitivity, but this quantity is poorly constrained with significant probabilities for
high values.
This lag is known as the difference between transient
climate sensitivity (TCS), which is immediate warming, and
equilibrium climate sensitivity (ECS), which includes the lag time and can be much
higher.
The figure of 1.7 C is actually for TCR (transient
climate response)-- so it is still possible that ECS (
equilibrium climate sensitivity) is as
high as 2.5 C.
Equilibrium climate sensitivity is likely in the range 1.5 °C to 4.5 °C (
high confidence), extremely unlikely less than 1 °C (
high confidence), and very unlikely greater than 6 °C (medium confidence)(Note 16).»
Along with the corrected value of F2xCO2 being
higher than the one used in the paper, and the correct comparison being with the model's effective
climate sensitivity of ~ 2.0 C, this results in a
higher estimate of
equilibrium efficacy from Historical total forcing.
The BEST team also found that the observed warming is consistent with an
equilibrium climate sensitivity of 3.1 ± 0.3 °C for CO2 doubling, in line with the IPCC
climate sensitivity range, and demonstrates once again that contrary to the persistent claims of Richard Lindzen, the Earth has warmed as much as we expect given a relatively
high climate sensitivity.
Annan said
equilibrium climate sensitivity is unlikely to be
higher than 4.5 °C - there are few if any mainstream
climate scientists who would disagree with this.
The 95 percent confidence range in this study was between about 1 and 7 °C
equilibrium sensitivity, so very low and very
high climate sensitivities could not be ruled out, but are relatively unlikely, based on the historical record.
Imposing a flat prior on an observable property, such as the
climate feedback or transient
climate response, is equivalent to imposing a highly skewed prior on the
equilibrium climate sensitivity, and therefore results in narrower posterior likelihood ranges on the
climate sensitivity that exclude very
high sensitivities.
Thus, a prior is a possibility for which the probability is
high of a low
equilibrium climate sensitivity.
On the contrary, the authors stated that to show the robustness of the main conclusion of the paper — a relatively small
equilibrium climate sensitivity — they deliberately adopted the regression model that gave the
highest climate sensitivity.
Compared with our prior, theirs emphasizes the
higher values of
equilibrium climate sensitivity.
A lower ratio would yield a
higher climate sensitivity estimate — for a ratio of 0.6, the range would be 2.2 — 3.8 C. TCR involves an interval of about 70 years, and so it is unlikely that a response to doubled CO2 would exceed 70 percent of the
equilibrium value in an interval that short.
The temperature rise at
equilibrium (known, unsurprisingly, as the «
equilibrium»
climate sensitivity) is
higher than the transient
climate sensitivity (how much
higher is uncertain).
Spencer and Braswell freely admit that using their simple model is just the first step in a complicated diagnosis, but also point out that the results from simple models provide insight that should help guide the development of more complex models, and ultimately could help unravel some of the mystery as to why full
climate models produce
high estimates of the earth's
equilibrium climate sensitivity, while estimates based in real - world observations are much lower.
Recently there have been some studies and comments by a few
climate scientists that based on the slowed global surface warming over the past decade, estimates of the Earth's overall
equilibrium climate sensitivity (the total amount of global surface warming in response to the increased greenhouse effect from a doubling of atmospheric CO2, including amplifying and dampening feedbacks) may be a bit too
high.
[Short response: Mainstream view is that
climate sensitivity (
equilibrium warming for a doubling of CO2) is 1.5 to 4.5 C, though
higher estimates can not be discounted.
Equilibrium climate sensitivity is likely in the range 1.5 °C to 4.5 °C (
high confidence), extremely unlikely less than 1 °C (
high confidence), and very unlikely greater than 6 °C (medium confidence).