[permaculture] Air pollution to blame for drought, says Australian researcher
pacedge at magna.com.au
Sun Aug 18 21:46:48 EDT 2002
AIR POLLUTION BLAMED FOR DROUGHT
Tiny atmospheric particles originating in the Northern Hemisphere may be
responsible for a catastrophic drought in the Sahel region of Africa,
according to Australian researcher Leon Rotstayn.
Sulfate aerosol particles make cloud droplets smaller and clouds
brighter and longer lasting; the clouds reflect more sunlight into
space, cooling the earth's surface below, which causes the tropical rain
belt to weaken, Rotstayn explains. The main impact has been in the Sahel
in northern Africa, which experienced a 49% drop in rainfall in the
second half of the twentieth century versus the first half.
"The Sahelian drought may be due to a combination of natural variability
and atmospheric aerosol," says Rotstayn. "Cleaner air in the future will
mean greater rainfall in this region."
Rotstayn is a member of the Model Development and Analysis team of the
Commonwealth Scientific and Industrial Research Organization.
Pacific Edge Media; TerraCircle regional development team
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 1257 bytes
Desc: not available
Url : http://lists.ibiblio.org/mailman/private/permaculture/attachments/20020819/4cf707f1/attachment.bin
More information about the permaculture