Monthly Archives: August 2010

Survey says…

There’s a survey about attitudes toward science, economics, and global warming, among other things. You may wish to participate, here.

Anthropogenic Global Cooling

Global warming during the 20th century was uneven, to say the least. In fact it occurred in two episodes, a warming from about 1915 to 1940, and another from about 1975 to the present. This is evident from a graph of global temperature anomaly over the last 130 years:

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On Ice with a Twist

Thanks to reader “DrC” for the tip about a new paper which takes a new view of variations in arctic sea ice. Most of us are familiar with the usual measures of sea ice. Using satellites we can estimate both sea ice area, which is the area of the sea which is ice-covered, and ice extent, which is the area of ocean which has 15% or more ice cover. Both measures are commonplace, perhaps extent is a bit more commonly reported. It’s easy to get daily up-to-date data on arctic ice extent from JAXA, and on arctic ice area from cryosphere today.

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Changes

I’ve often said that the modern global warming era starts in 1975. Denialists seem to love to accuse me of cherry-picking that time. In fact I’ve received some really nasty comments to that effect, most of which went straight into the trash-bin. The fact is that I didn’t pick 1975 out of thin air, nor is it cherry-picked. It’s an estimate of the time at which the trend in global temperature took its modern value. I’m not interested in answering fabricated, ignorant objections. But sincerely interested readers might want to know where the 1975 comes from.

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Mister Cherry

Steve Goddard has a new post at WUWT in which he accuses the National Wildlife Federation of “stretching the truth.” It turns out he’s stretching things himself.

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Red Hot

This summer in Moscow the weather has been more than just unpleasant. It’s been dangerous. Not only has Moscow suffered through its worst heat wave ever, the heat has dried out forests and peat bogs in surrounding areas, leading to extensive wildfires which have filled the air with smoke. This has made the air in the city of 10,000,000 unhealthy to breathe; citizens are advised to stay indoors and keep their windows closed. Ordinarily, in such oppressive heat that suggestion would be a bad joke — but with air pollution at such dangerous levels it is, unfortunately, sound advice.

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Mo’ Better Monckey Business

RealClimate recently hosted a guest post by Barry Bickmore about some of Christopher Monckton’s claims. It included this passage about Monckton’s claim that CO2 concentration isn’t rising exponentially, but only linearly:


In other words, the slope keeps getting larger in an exponential trend, but stays the same in a linear trend. Monckton is right that you can do that sort of statistical test, but Tamino actually applied Monckton’s test to the Mauna Loa observatory CO2 data since about 1968 and found that the 10-year slope in the data has been pretty continuously rising, including over the last several years.

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Urban Wet Island?

The June 2010 issue of BAMS (Bulletin of the American Meteorological Society) contains the State of the Climate in 2009 report (Arndt, D. S., M. O. Baringer, and M. R. Johnson, Eds., 2010: State of the Climate in 2009. Bull. Amer. Meteor. Soc., 91 (6), S1-S224). One feature of the report is the display of key climate indicators, each being a time series which is unambiguously expected to be going in some particular direction due to global warming. You can view graphs and download the data here.

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