In an essay published online then at MIT Technology Review, I worried that the famous «hockey stick» graph plotted by three American climatologists in the late 1990s portrayed the global
warming curve with too much certainty and inappropriate simplicity.
Wouldn't a proper scientific observation start from that point, as a matter to criticize Mike's work, rather than nit picking details which seem at first glance totally irrelevant to the main issue, the recent
warming curve with reconstructions corresponds exactly to what is happening.
Not exact matches
Till now, climate modellers» forecasts of future
warming have resembled the famous bell
curve,
with the most likely result of doubling CO2 being a temperature increase of about 3 °C, and
with declining probabilities on either side for a narrow range of higher and lower temperature rises (see Graph).
The fact that more methane is released when temperature rises is a normal linear response, probably associated
with a growing number of
warm days in Arctic (which is probably partly due to a high AMO oscillation), but I see no sign of a feedback on methane
curve.
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So if you just took the relative change since 1999, not the absolute numbers as compared to the red
curve, their new model would predict the same
warming as a standard scenario run (i.e. the black one), which would hardly have been a reason to go to the worldwide media
with a «pause in
warming» prediction.
The
curves, displaying results using both Goddard's temperature data and those from the Hadley Center for Climate Prediction in England, show a much smoother trend toward a
warmer world (
with very clear drops associated
with volcanic eruptions).
Again, all of this is inevitably going to happen, slowly, while
curves for costs and prices are unavoidably shifting for reasons including those having nothing directly to do
with combating global
warming.
BTW, aside from averages, I notice that the seasonal temperature
curve seems to have been pushed forward in time a few weeks,
with it statying
warmer or colder longer in the year.
To the contrary, first off the temperature reconstruction
curve is not perfect, but serves us well, it shows a recent
warming, conforming
with AGW theory.
A
curve with no trend does not demonstrate that something is unaffected by global
warming.
It turned out things were far more nuanced (as he later said, «The Earth system may be less responsive in the
warm times than it was in the cold times»), but in a field that had long mainly foreseen smooth
curves for planetary change
with rising greenhouse gas levels, the result was a vital focus on the risks of abrupt climate change.
And, although I would love to claim that «ocean» is my real name, the reason I am using a pseudonym is that anonymity allows me more confidence in asking stupid questions because I am still on a learning
curve with global
warming on other material discussed on RC.
The authors say they've combined «empirical fitness
curves»
with «projected geographical distribution of climate change for the next century» and have concluded that insects living in the tropics may suffer more from global
warming than insects that live in cooler locales.
A final question: was the intent of this study to end up
with the underlying exponential
warming curve or did that just happen after all the noise was filtered out?
I'd agree
with you that «it is an interesting graph», but even Vaughan agrees that the exponential
curve is most likely pessimistic (i.e. there will be less that 4C
warming by 2100).
This would get us to 600 ppmv by 2100 (all other things being equal), around the same as IPCC «scenario + storyline» B1 or A1T,
with warming by 2100 of 2C (rather than 4C as predicted using the exponential
curve).
Where it fails miserably is in predicting the future (the
curve with future
warming should never have been included in the poster, as I pointed out to Vaughan Pratt, because it is highly misleading).
The particularly striking flat portion of MRES is from 1860 to 1950, which is strong support for my point that global
warming can already be observed starting in 1860 as shown in Figure 2, Observed Global Warming or OGW, and follows a curve that is in remarkable agreement with what the greenhouse effect hypothesis should p
warming can already be observed starting in 1860 as shown in Figure 2, Observed Global
Warming or OGW, and follows a curve that is in remarkable agreement with what the greenhouse effect hypothesis should p
Warming or OGW, and follows a
curve that is in remarkable agreement
with what the greenhouse effect hypothesis should predict.
If the data for the past ten thousand years was
curve fit, it would show a
warm max about now
with a cool period to follow.
The graph
with a rising
warming curve through time seems to correspond pretty well to the one swanson and tsonis found:
I played
with the four magic parameters (no wiggling ears) within the allowed ranges and found if you put the kabosh on the 15 - year Hansen delay, CO2 start at 270ppm instead of 287ppm, 1.1 C / doubling, you can get a lovely
curve with 0.6 C
warming since 1850 instead of 0.8 C. I didn't try but I'm pretty you can then tweak the filter to get the millikelvin accurate shape.
I prefer to start the no -
warming period
with 2001 because satellite
curves that are more accurate than ground based
curves used by the Met Office show that the temperature dips to the preceding La Nina level on both sides of the 1998 super El Nino peak.
«Whether there's a little more oil or a little less oil will change the details, but if we want to change the overall shape of the
warming curve, it matters what we do
with coal.»
The fact that this is a line, not a
curve with increasing slope
with increasing years shows that there has not been any change in the global
warming rate.
Flashman, the chart in your link doesn't support the kind of «global
warming» that you warmists preach: it's not proportional
with the Keely CO2
curve.
If manmade global
warming is true the temperature is going to keep rising, irregardless of past changes and whether you can fit them
with various
curves.
John Philips (13:43:35) «Trends» have become virtually meaningless lately, since the word has been so variably used, but try this: Eyeball the temperature
curve as correlated to the Pacific Decadal Oscillation and you will see an excellent relationship
with the cyclic cooling and
warming phase of the PDO overlaid on a gradual
warming trend emerging from the Little Ice Age.
Superimposed on this trend line is a cyclical
curve resembling a sine
curve,
with an amplitude of somewhere around + / - 0.2 C and a total
warming / cooling cycle time of around 60 years.
The empirical
curve forecast (black
curve made of the harmonic component plus the proposed corrected anthropogenic
warming trend) looks in good agreement
with the data up to now.
Looked at more closely however, it has
warmed and then cooled slightly in a cyclical fashion roughly like a sine
curve on a tilted axis,
with a total
warming / cooling cycle time of about 60 years and an amplitude of plus / minus 0.2 C.
It is seen by eye that the smoothed
curve captures the main episodes of
warming and cooling in the past 162 y that are present in the raw data as it agrees
with the simple running mean.
The heat content of the oceans shows a large sinusoidal
curve (see Levitus 2005 figure 1),
with cooling (while GHGs are increasing) and
warming.
Also, RGB at Duke would scold R.Gates for making the «schtick» «First, the climate now is not
warmer than it was in the Holocene Optimum (do not make the mistake of conflating the high frequency, high resolution «2004 ″ data point
with the smoothed low frequency, low resolution data in the
curve — even the figure's caption warns against doing that — for the very good reason that in every 300 year smoothed upswing it is statistically certain that the upswing involved multidecadal intervals of temperatures much higher than the running mean.
«Accounting for multiple sources of uncertainty, a composite of several OHCA
curves using different XBT bias corrections still yields a statistically significant linear
warming trend for 1993 — 2008 of 0.64 W m - 2 (calculated for the Earth's entire surface area),
with a 90 - per - cent confidence interval of 0.53 — 0.75 W m - 2.»