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Monday 30 August 2010

The BBC and another event blamed on Climate Change despite the facts pointing elsewhere

The BBC report that:
'Global climate change is partly to blame for the abnormally hot and dry weather in Moscow, cloaked in a haze of smoke from wildfires, say researchers.

The UK Met Office has said there are likely to be more extreme high temperatures in the future.

Experts from the environmental group WWF Russia have also linked climate change and hot weather to raging wildfires around the Russian capital.'
Oddly the BBC do not quote the NOAA, one of their usual sources of climate change crap.

Maybe Street Wise Professor has the explanation:
'The extreme surface warmth over western Russia during July and early August is mostly a product of the strong and persistent blocking high. Surface temperatures have soared as a result of the combination of clear skies, sinking motion within the environment of the high pressure causing compressional heating of air, the lack of any temporary relief owing to the blocking of the typical cold fronts that cool the region intermittently in summer. Add to this scenario the cumulative effect of drought that began in early summer which has caused soils to dry and plants to desiccate to wilting point , thereby causing additional surface warming via land feedbacks as the blocking condition persisted. These are all well-known and studied physical processes that have accompanied summertime blocking and heat waves in the past.

...

Despite this strong evidence for a warming planet, greenhouse gas forcing fails to explain the 2010 heat wave over western Russia. The natural process of atmospheric blocking, and the climate impacts induced by such blocking, are the principal cause for this heat wave. It is not known whether, or to what exent, greenhouse gas emissions may affect the frequency or intensity of blocking during summer. It is important to note that observations reveal no trend in a daily frequency of July blocking over the period since 1948, nor is there an appreciable trend in the absolute values of upper tropospheric summertime heights over western Russia for the period since 1900.

The indications are that the current blocking event is intrinsic to the natural variability of summer climate in this region, a region which has a climatological vulnerability to blocking and associated heat waves (e.g., 1960, 1972, 1988). A high index value for blocking days is not a necessary condition for high July surface temperature over western Russia—the warm summers of 1981, 1999, 2001, and 2002 did not experience an unusual number of blocking days.'

The BBC always willing to drop a favourite source if they stray from the 'narrative'.

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