Asia's growing air pollution — billowing plumes of soot, smog and wood smoke — is making the Pacific region cloudier and stormier, disrupting winter weather patterns along the West Coast and into the Arctic, researchers reported Monday.
Carried on prevailing winds, the industrial outpouring of dust, sulfur, carbon grit and trace metals from booming Asian economies is having an intercontinental cloud-seeding effect, the researchers reported in the Proceedings of the National Academy of Sciences.
The study is the first large-scale analysis to draw a link between Asian air pollution and the changing Pacific weather patterns.
"The pollution transported from Asia makes storms stronger and deeper and more energetic," said lead author Renyi Zhang at Texas A&M University. "It is a direct link from large-scale storm systems to
pollution."
Satellite measurements reveal that high-altitude storm clouds over the northern Pacific have increased up to 50% over the last 20 years as new factories, vehicles and power plants in China and India spew growing amounts of microscopic pollutant particles into the air.
The resulting changes have altered how rain droplets form and helped foster the creation of imposing formations over the northern Pacific known as deep convective clouds.
The clouds create powerful updrafts that spawn fiercer thunderstorms and more intense rainfall, particularly during the winter, the researchers said.
Only a decade ago did scientists in the University of California's Pacific Rim Aerosol Network help discover that the pollution crossing the Pacific from Asia was worse than suspected, with millions of tons of previously undetected contaminants carried on the wind.
In fact, on any spring or summer day, almost a third of the air high over Los Angeles, San Francisco and other California cities can be traced directly to Asia, researchers said.
http://www.latimes.com/news/nationworld/world/la-sci-asiapollute6mar06,1,1341047.story?coll=la-headlines-world&ctrack=1&cset=true
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