Studies have shown that prolonged gazing at
a spaghetti graph of climate model ensembles reduces visual acuity by 38 % and lowers the I.Q. by 42 full points.
It retained the hockey stick reduction, but obscured it by burying it in
a spaghetti graph of a dozen or so contemporary reductions.
The big question then is, why are the results from this model included in
the spaghetti graph of figure 1.4 in the SPM or anywhere else in the report unless it were to point out its failure?
The IPCC AR5 provides
a spaghetti graph of 95 computer model projections.
Danny, your question just made me envision a tv weather guy presenting
a spaghetti graph of tomorrow's projected weather....
Richard suggested that
a spaghetti graph of individual AR4 runs be supplied as a figure additional to Figure 1.4.
Not exact matches
This is designed as a second lesson on trig
graphs, building on the excellent
spaghetti lesson 7... this with the previous lesson gives an excellent foundational understanding
of trig
graphs, which makes all other lessons much easier.
Finally, it should be noted that the bristlecone series are included in most
of the post MBH98 reconstructions that the feature in the «
spaghetti graphs» employed to validate MBH98.
And I compare the referenced
spaghetti graph with the
graph of Briffa 1998 from Proc Roy Soc London, reproduced by McIntyre on page 3
of his notes, I find myself wondering whether the data on which the 1999
graph is based have been made public, or not.
There is absolutely no error analysis, and all those
spaghetti graphs are the modeler's estimate
of what happens to their model once they fiddle the parameters to fit the temperature curves and they change the initial conditions
of the time development!
The «
Spaghetti graphs» in the following gives an impression
of the huge variability among the datasets.
A leaflet I picked up at a renewable energy exhibition in France showed it large as life — without any other member
of the
spaghetti graph.
The definitive timeline and sources
of the draft versions
of the TAR «
spaghetti graph», along with a comparison with the AR4 equivalent.
The AR4
spaghetti graph shows the average
of runs within a model for 21 models (A1B) and observations fall outside the range shown in Figure 10.5 A1B, giving a much different impression than that
of the re-stated Figure 1.4.
Not even a communal set
of predictions [
spaghetti graph] for the 21st century where each proponent gets to plot a curve with a different color.
And regardless, even if you look at just the
spaghetti monster
graph it is quite clear that we are running completely on the cool side
of the model ensemble and to increase confidence we need better models (current best guess is they should be less sensitive and less attributive, to say the least).
As you observe, there is a
spaghetti graph in AR4, the range
of which (AR4 Figure 10.5) is wider than the projections shown in AR4 FIgure 10.26.
If IPCC intended this range
of projections to represent their uncertainty range, then that is what they should have shown in AR4 Figure 10.26 (which is more consistent with the Technical Summary than the range in the
spaghetti graph.)
Thus, IPCC's decision to change the basis
of comparison to
spaghetti graph was not done to eliminate an «error» as SKS and others have alleged, but for some other purpose — perhaps to avoid giving «fodder to skeptics», perhaps for some other purpose not yet stated.
If «hiding the decline» has already been found to be «misleading» in one situation it can hardly fail to be «misleading» in the use
of the
spaghetti graphs.
However, as Steve has pointed out, none
of the
spaghetti graphs used by IPCC states that there has been «hiding the decline» in the particular
graph.
Post-1960 values
of the Briffa MXD series are deleted from the IPCC TAR multiproxy
spaghetti graph.
-LSB-...] This «apparent» truncation
of data had been spotted and discussed at Climate Audit as far back as 2005: Post-1960 values
of the Briffa MXD series are deleted from the IPCC TAR multiproxy
spaghetti graph.
In the instance
of the
spaghetti graph above, there was a nice piece
of temporal correlation.
In
spaghetti graphs after Jones et al 1999, instead
of bodging the data to hide the decline, CRU deleted the adverse data to hide the decline.
He'd write it up except, oh yeah, the data underlying most
of the
spaghetti graphs is still unarchived.
I notice the complete failure
of the NIPCC report to show any global or hemispheric temperature reconstructions apart from the «
spaghetti graph» ones which show temperatures currently are more likely warmer the MWP.
(05:07:34) Sorry, Joel, I've seen the
spaghetti graphs and something like two
of the twenty
graphs show a short cooling trend possible.
The reality is that not all
of the data and methods are available to recalculate the curves in those
spaghetti graphs.
Sorry, Joel, I've seen the
spaghetti graphs and something like two
of the twenty
graphs show a short cooling trend possible.
It is not errors that those
spaghetti graphs show, but the stability
of the solutions.
The so called «
spaghetti»
graphs used in figure 2 above are interesting, but their range
of variability (excepting Moberg et al) remain almost as limited as their iconic predecessor the «Hockey stick» produced by Dr Michael Mann et al and from which the IPCC third assessment report graphic from 2001 was derived.
If that
spaghetti graph is from model output that is restricted to the tropics, then those models have climate sensitivity for the tropics simular to the gloval sensitivity
of about 3.
In nearly all defences
of the deletion
of the decline in
spaghetti graphs that yield a rhetorical effect
of coherence between the Briffa and other reconstructions in the last half
of the 20th century, it's been argued that the divergence problem was fully disclosed in a couple
of 1998 Briffa articles and that this disclosure in the original technical literature constituted sufficient disclosure — a point that I contested long before Climategate.
Are you disputing Steve's assertion that it is the two papers
of Briffa that are used by defenders
of the the various
spaghetti graphs to demonstrate that the divergence problem was discussed in the literature?
The increasing power
of computer reconstructions since MBH98 and 99 resulted in the more sophisticated «
spaghetti graphs» using multiple proxies, which somewhat modified the findings
of the earlier hockey stick, but reinforced the notion
of a world rapidly warming over the last century, in a manner unprecedented for at least a thousand years.
b) The
spaghetti graph and assertion that the data is now included is a spectular, new, method
of «data dredging».
The result looks like a bundle
of spaghetti and is called a «
spaghetti graph» — a bunch
of possible outcomes.
-LSB-...] Hide the Decline: Sciencemag Science published one
of the first
spaghetti graphs (in Briffa and Osborn 1999 here) as part
of an invited comment on -LSB-...]-LSB-...]
The Yang Chinese composite, after the Mann PC1 and Yamal, had the third - largest hockey stick shape
of the proxies illustrated in the IPCC AR4
spaghetti graph.
The results
of different Thompson versions
of Dunde make a
spaghetti graph all by themselves.