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In The Weekend Australian I wrote that many false claims are made about the state of our environment on an almost daily basis but because most Australians are illiterate when it comes to science and maths, they are mostly just accepted. My first example was eastern Australian rainfall and the claim that the east coast of Australia has suffered declining rainfall, a claim first made by Sir Nicholas Stern in his influential report to the British Parliament.

I explained that observational data on rainfall for the entire east coast of Australia is available from the Australian Bureau of Meteorology with yearly averages for all the sites back to 1900. But, contrary to the Stern report, this chart does not show declining rainfall; rather, it indicates that rainfall was very low in the early 1900s, that there were some very wet years in the late ’50s and early ’70s, and overall the trend is one of a slight increase in rainfall during the past 107 years, Chart 1.

Chart 1.

While I received many emails, phone calls and The Australian published several letters supportive of my analysis, there have been criticisms including the following comment published in The Australian, “A number of scientifically indefensible ways of presenting data are used in the “Case of the warm and fuzzy”. In each case the errors support the author’s conclusions… In two of the six graphs shown the data is fitted to a straight line which is claimed to show an upward trend in rainfall. What would happen if a non-linear fit (eg, quadratic) were used instead of linear fit.. Dennis Matthews, Ironbark, SA.”

When I fit a simple quadratic equation to the data, it also shows an increase in rainfall over the 107 year period, Chart 2.

Chart 2.

But there is really no reason to assume that the rainfall data would be represented by any particular equation (linear or quadratic). These trend lines are unlikely to provide any insight into what is likely to happen next year because weather systems, like financial markets, are complex.

But interestingly, even fitting an 11 year moving average shows a trend of increasing, not decreasing, rainfall, Chart 3.

Chart 3.

My advice to those trying to interprete data presented graphically would be to use what Professor Harry Roberts, University of Chicago Graduate School of Business, has described as the world’s most powerful statistical analysis tools – your eyes. What can you see from the squiggly line, Chart 4?

Chart 4.

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Hat tip to MR for the Harry Robert’s advice.

Two years after the 1883 eruption of Krakatoa, the Indonesian supervolcano, Robert Leslie published a note in the journal Nature describing wispy blue filaments in the night sky. He is now credited with the discovery of noctilucent clouds (NLCs).

Photograph from the International Space Station, positioned 340 km over western Mongolia on July 22, 2008. Clouds estimated to be 83km above earth (at the edge of space). Credit to NASA at http://science.nasa.gov/headlines/y2008/25aug_nlc.htm

According to Gary Thomas, atmospheric scientists at the University of Colorado, the clouds are thought to be spreading and their first sightings coincide with the Industrial Revolution.

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Thanks to Willem for the link.

“IN a new e-book ‘Global Warming—Global Cooling, Natural Cause Found’, meteorologist and climate researcher David Dilley utilizes nearly a half million years of data linking long term gravitational cycles of the moon explain the recent global warming, rises in carbon dioxide levels, and for 2200 global warming cycles during the past half million years.

“The gravitational cycles are called the Primary Forcing Mechanism for Climate (PFM), and act like a magnet by pulling the atmosphere’s high pressure systems northward or southward by as much as 3 or 4 degrees of latitude from their normal seasonal positions, and thus causing long-term shifts in the location of atmospheric high pressure systems.

“Research by Mr. Dilley shows a near 100 percent correlation between the PFM gravitational cycles to the beginning and ending of global warming cycles. Global warming cycles began right on time with each PFM cycle during the past half million years, as did the current warming which began 100 years ago, and it will end right on time as the current gravitational cycle begins its cyclical decline.

“Global temperatures have cooled during the past 12 months. During 2008 and 2009 the first stage of global cooling will cool the world’s temperatures to those observed during the years from the 1940s through the 1970s. By the year 2023 global climate will become similar to the colder temperatures experienced during the 1800s.

“Mr. Dilley of Global Weather Oscillations has found seven different types of recurring gravitational cycles ranging from the very warm 460,000 year cycle down to a 230year recurring global warming cycle. All of the gravitational cycles coincide nearly 100 percent with 2200 global warming events during the past half million years. This includes the earth’s current warming cycle which began around the year 1900, and the first stage of global cooling that will begin during 2008 and 2009.

“The release of the book culminates 19 years of research clearly linking gravitational cycles as the cause for fluctuations within the earth’s climate. The book is available as an electronic e-Book on this website. The author David Dilley is a meteorologist and climate researcher with Global Weather Oscillations Inc.” [end of quote]

Information from David Dilley via the ICECAP blog

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