NewScientist.com news service 23 July 2007
The pattern of rainfall around the world is being changed by greenhouse-gas emissions from human activities, researchers have shown for the first time.
Tropical regions north of the equator, including such areas as the Sahel in Africa which borders the Sahara desert, have already begun to get even drier and will continue to do so, the data show. Regions in the far north, including Canada, Northern Europe and Russia, will get wetter, as will the southern tropics.
Detecting the effects of climate change on rainfall patterns has proved much more elusive than temperature changes because of the much greater natural variability of precipitation.
The key was to take results from 92 computer simulations, using 14 different global circulation models, and to compare the average of these with actual rainfall data over wide bands of latitude around the world. Read More