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As the east coast of the U.S. braces for Nor'easter Nemo, what's the weather been like for other countries around the world? Here, a young girl is pictured with her dog and a pony as it snows near Warsaw, Poland on Feb. 7, 2013.
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Afghan motor-cyclists ride in front of the war-damaged Darlaman Palace in Kabul on Feb. 7, 2013.
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A snow plow clears a road on Feb. 7, 2013, in Banska Bystrica, Slovakia.
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Snow covers the pavement in front of the Semperoper (Semper Opera House) in Dresden, eastern Germany, on Feb. 7, 2013.
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Pakistani Kashmiris walk through the snow in Muzaffarabad, the capital of Pakistani-administered Kashmir on Feb. 6, 2013.
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Commuters shelter from the snow under umbrellas whilst on their way to work in Tokyo on February 6, 2013.
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Indonesian people wade through a flooded main street in Jakarta on Feb. 6, 2013.
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Indonesian motorists maneuver through a flooded main street in Jakarta on Feb. 6, 2013.
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A Kashmiri fisherman rows his boat during a sunny day at Dal Lake, on Feb. 6, 2013 in Srinagar, India.
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Cars stand still on a road after snowfalls on Feb. 6, 2013 in Essen, western Germany.
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A rickshaw puller trying to protect himself from showers with umbrella on Feb. 5, 2013 in Noida, India.
Pollution from China's coal-burning power plants is pumping up winter storms over the northwest Pacific Ocean and changing North America's weather, a new study finds.
Northwest Pacific winter storms are now 10 percent stronger than they were 30 years ago, before Asian countries began their industrial boom, according to research published today (April 14) in the Proceedings of the National Academy of Sciences.
North America will be hardest hit by the intensifying storms, which move from west to east, said lead study author Yuan Wang, an atmospheric scientist at NASA's Jet Propulsion Laboratory in Pasadena, Calif.
"The increasing pollution in Asian countries is not just a local problem, it can affect other parts of the world," Wang told Live Science.
Aerosol emissions have rapidly increased in Asia in recent decades. For example, China is now the world's largest coal consumer, and in Beijing, air pollution levels have soared 400 times higher than World Health Organization limits. In contrast, aerosols from North America and Europe have meanwhile decreased, because of clean air regulations. [China's Top 6 Environmental Concerns]
Wang and his co-authors examined how the tiny pollution particles in Asia play a role in cloud formation and the storms that spin up each winter east of Japan, in a cyclone breeding ground north of 30 degrees latitude. Monsoon winds carry aerosols from Asia to this storm nursery in the winter.
The researchers created a computer model of six kinds of aerosol pollution and tested their effects on clouds, precipitation and global weather patterns. Different aerosols affect storms in varying ways, such as by blocking the sun's radiation or providing a nucleus around which water vapor can condense to form raindrops.
The new study finds that sulfate aerosols are among the most important drivers of Pacific storms, by encouraging more moisture to condense in clouds, Wang said.
Pollution from Asia is also changing weather patterns over North America, Wang added.
Wang said this winter's unusually cold weather east of the Rocky Mountains could have been influenced by pollution-driven cyclones and high-pressure systems in the northern Pacific. These Pacific weather patterns caused swoops in the jet stream that drove cold air south across the central and eastern United States — the so-called polar vortex. The same weather patterns are linked with record-high temperatures in Alaska this winter.
"This cold winter in the U.S. probably had something to do with stronger cyclones over the Pacific," Wang said.
The researchers are testing more sophisticated computer models to better understand the effects of stronger storms and increasing pollution on global weather patterns, Wang said.
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