https://bobtisdale.files.wordpress....arming-and-the-illusion-of-control-part-1.pdf
What is Global Warming?
The term “global warming” has come to mean the warming of our planet Earth (the surface, the lower atmosphere, and the oceans to depth) that has been caused by, and will be further enhanced by, the emissions of man-made greenhouse gases. No one bothers calling it
man-made global warming or
anthropogenic global warming or
human-inducedglobal warming anymore. Whenever a news report or article uses the term global warming, everyone now assumes they’re talking about the hypothetical man-made kind of warming.
There are many possible reasons why global warming has occurred over the past few decades, some of which are natural, but the primary focus of research has been on the consequences of increased emissions of carbon dioxide into the atmosphere that result from the burning of fossil fuels.
Graphs that show global land plus ocean surfaces warming since pre-industrial times are commonplace. Figure 1.2-1 shows the annual global land+ocean surface temperature anomalies, based on the
UKMO HadCRUT4 reconstruction, from its start year in 1850 through to 2014. Based on the linear trend, global surfaces are warming at a not-very-alarming long-term rate of about 0.06 deg C/decade (about 0.10 deg F/ decade)…for a total warming of less than 0.8 deg C (about 1.4 deg F) since 1880.
The linear trend line also helps to illustrate that the warming was not continuous. Initially, there is a period of cooling followed by a period of warming until the mid-1940s. Then the cycle repeats itself with a period of cooling until the mid-1970s, followed by a warming period. Because the rates of warming during the two warming periods are greater than the cooling rates during the two cooling periods, there is a positive warming trend.
That leaves us with a very basic question. Should we expect another multidecadal cooling period, or at least a slowdown lasting for a couple of decades, before another warming period? Rephrased, would we expect the multidecadal (approximately 60-year) cycle to repeat itself?
Many persons believe the cycle will repeat into the future. The climate modelers do not. Their models have been tuned to extend (and amplify) the warming from the more recent higher-than-average warming period out into the future, without accounting for the cyclical nature of global warming. If the cycle continues into the future, then the climate models have simulated too much warming…way too much warming.
THE RATE OF WARMING IS SO SMALL WE HAVE TO BE TOLD GLOBAL WARMING IS HAPPENING. WE CAN’T SENSE IT.
In the Introduction, I noted we have to be told global warming is occurring…that
we as individuals would not be able to sense that global surface temperatures have warmed. Daily and seasonal variations in local temperatures are so great that we’d never notice the slight change in global surface temperatures we’ve experienced since the mid-1970s. It’s only about 0.7 deg C or
1.3 deg F (based on the linear trend), and it’s occurred over a 40-year period.
Think about how great the temperature variations are at your home: over the course of every year…and daily. Here are examples from a widely referenced dataset.
In the two graphs in Figure 1.2-2, the increase in annual global surface temperature (red curves) since 1880 (same red curve as in Figure 1.2-1) is compared to daily maximums (orange curves) and minimums (dark green curves) for the Central England Temperature dataset, during that same timeframe. The top graph shows the three datasets in deg C, while the bottom graph shows them in deg F.
The
UKMO Central England Temperature (a.k.a. HadCET or simply CET) dataset is the longest continuous temperature record in the world. It is supported by the 1992 Parker et al. paper
A new daily Central England Temperature series. As its name suggests, it is not based on a temperature record at one specific location but rather a group of locations in Central England.
Daily Central England maximum (Tmax) and minimum (Tmin) temperature data are available from the KNMI Climate Explorer, specifically the
Daily climate indices webpage, starting in 1878.
The minimums of the green curves in Figure 1.2-2 above show the lowest temperatures reached each year, and the maximums are the highest annual temperatures. Obviously, the range in temperatures that Central England sees every year dwarfs the rise in global surface temperatures.
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It is obvious to me that Tisdale is right. Cycles repeat themselves and the variation of individual reading of temperature far exceeds the average temperature readings over the time period. Statistically, one can be 99.999% certain that there is no change occurring.