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Climate change may boost Middle East rainfall
Date:8/13/2008

The prospect of climate change sparking food and water shortages in the Middle East is less likely than previously thought, with new research by an Australian climate scientist suggesting that rainfall will be significantly higher in key parts of the region.

Recent projections from the Intergovernmental Panel on Climate Change (IPCC) raised fears that storm activity in the eastern Mediterranean would decline this century if global warming continues on present trends. In turn, that would have reduced rainfall by between 15 and 25 per cent over a large part of the so-called Fertile Crescent.

This is land encompassing parts of Turkey, Syria, northern Iraq, and north-eastern Iran and the strategically important headwaters of the Tigris and Euphrates rivers.

When University of New South Wales Climate Change Research Centre researcher Dr Jason Evans analysed the IPPC projections, he found that the region's agricultural base faced significant challenges as a result. About 170,000 square kilometres of viable rain-fed agricultural land would be lost; a longer dry season would limit grazing on rangelands; and changes in the timing of maximum rainfall would force farmers in northern Iran to change cropping strategies and even crop types. The results are to be published in the journal Climatic Change.

But the IPCC projections were based on the results of global modelling of climate change, which tends to obscure smaller-scale regional effects.

"The global models are good for investigating what's likely to happen on a planetary scale but the resolution is quite coarse when looking at a more localised regional scale," says Dr Evans. "It's a bit like enlarging a digital photograph until it becomes pixellated and all sorts of detail is blurred out."

"Simulating the climate of the region is a challenge for climate models, due in part to the high natural inter-annual variability, the topography of the region - which includes multiple
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Contact: Bob Beale
bbeale@unsw.edu.au
61-249-303-440
University of New South Wales
Source:Eurekalert

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