It has been widely noted across the entire blogosphere
(and even the mainstream
press outlets) that the IPCC AR5 summary report avoided the very uncomfortable
truth that modern global warming has gone literally AWOL over the last 15+ years, and the associated
IPCC climate models' spectacular failure to predict
this non-global warming environment.
Understandably, the IPCC's political bureaucrats don't
want to shine a light on their previously claimed "irreversible",
"incontrovertible", "irrefutable", "unequivocal",
"indisputable", "relentless", "dangerous" and
"accelerating" CO2-warming that has turned into the unprecedented
modern "hiatus".
The IPCC's lack of analysis regarding this 15-year
"pause" was replaced with an attempt to obscure the current temperature reality with a laughable decadal
analysis. 'C3' previously
commented on the lameness of the IPCC's decadal 'smoke and mirrors' as did others
(here,
here,
here).
The IPCC's decadal approach to relied on 'decadal means.'
There are other approaches, including analyzing decade-end
temperatures, decadal-trends as shown
here or by examining the moving 10-year (decadal) periods.
(click on image to enlarge, sources for HC4 and CO2 data)
In this article, we look at the moving decadal spans
since January 1, 1950 through August 2013 (the IPCC states that at least 50% of
the warming is due to anthropogenic reasons over this 764-month period) versus
the previous 764-month period (May 1, 1886 through December 1949) that the IPCC
infers was dominated by natural climate forces.
From the two 764-month periods, it is possible to
generate 645 moving 10-year average data points for both the modern era and the earlier 20th century period. The
above two charts plot the moing decadal data points for both periods.
Per an examination of the 10-year moving averages for
each time span, there are several points of interest, including:
•Despite
the vast differences between the two period's absolute CO2 levels and growth
rates, the warming characteristics of the two periods are more alike than
different.
•These
ten-year curves, and their respective 2nd order fits, visually share similar
characteristics such that one could easily and safely conclude that the modern warming was simply a repeat of the
earlier period's warming (note: recall,
the IPCC states that the earlier warming was not due to anthropogenic reasons).
•The
10-year moving average curves reveal that both the earlier and modern periods
experienced a cooling phase, then a significant warming phase prior to leveling
out to a plateau (a 'hiatus') close to the end.
•The
warming phase during the modern era was 417 months in duration; the early 20th
century period had a warming phase of 397 months (only a 20-month difference).
•Based
on 10-year moving averages, the earlier warming period produced a +0.75°C per century trend, which is not that terribly
different than the modern warming of a 1.16°C per century trend.
•If
modern warming were to revert to the earlier warming trend (after the "hiatus"), by year 2100AD
global temperatures would increase by +0.65°C. In contrast, a continuation of
the modern warming trend would produce an increase of +0.99°C, just one-third
of a degree greater.
•When
comparing the differences between the lowest to highest 10-year average
temperature for each warming period, the modern change was less than one-tenth
degree greater.
•The
modern era's CO2 level absolute increase and linear trend growth were both
approximately 5 times greater than the earlier periods respective values.
•Yet
the earlier period's degree change per ppm was over 3 times greater than that
experienced during the modern warming.
Obviously, this type of decadal analysis reveals an
abundance of similarities shared by the two 20th century warming periods. In
fact, this analysis makes it clear that over 50% of the modern global warming
could be a direct result of the same natural climate forces that warmed the world
prior to the 1950s.
This analysis also directly contradicts the IPCC's
anti-science terminology ("irreversible", "incontrovertible",
"irrefutable", "unequivocal", "indisputable",
"relentless", "dangerous", "accelerating" and
"unprecedented") used to
describe the modern era of warming. Simply put, none of these descriptors are
accurate - they are without any empirical scientific merit.
Unsaid in this analysis (and the IPCC's) is that portion
of modern warming associated with anthropogenic factors is not exclusively due
to CO2 and other greenhouse gases. Other anthropogenic forces causing increases
includes a wide spectrum of land-use issues, black soot pollution, 'slash and
burn' deforestation practices, the urban heat island (UHI) effect, poorly sited
climate/weather stations, the egregious fabrication
of modern global warming by governmental climate agencies and other factors.
Finally, this decadal analysis reveals the absolute known
physics of CO2-induced warming: per the actual physics, it has been established
that the climate response (i.e. global temperatures) is logarithmic.
This means that the earlier rises of atmospheric levels (ppm) of CO2 have
a much greater impact on the climate than the later CO2 increases (ppm).
As the charts detail, the CO2 impact on temperature
degrees was 3 times greater during the early warming than the modern warming
(+0.23°C per CO2 ppm
versus +0.007°C per
CO2 ppm). This confirms the actual climate science physics, while at the same time pretty much
demolishing the fears of the totally speculative, failed and unsubstantiated
"positive feedback" physics that alarmists continue to rely on.
Empirical-based science rules, no?
Additional modern, regional, fabricating-fake and historical temperature charts