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AGU Journal highlights - Feb. 29 2012
Date:2/29/2012

2010 to June 2010 using a global high- resolution climate chemistry model.

They quantified the contribution of Asian pollution to surface ozone levels in both densely populated regions such as the Los Angeles area and rural areas such as national parks. They find that Asian pollution contributes as much as 20 percent of total ozone during springtime pollution episodes in western U.S. surface air.

Current guidelines from the Environmental Protection Agency dictate that, averaging over 8 hours, surface level air should have no more than 75 parts per billion per hour by volume of ozone. Although local pollution plays a large role on days when that standard is not met in Southern California, the authors estimate that 53 percent of the instances where that limit was exceeded would not have occurred without the contribution from Asian air pollution.

The researchers also find that an index based on satellite observations of Asian pollution plumes could serve as a qualitative early warning indicator, with a lead time of one to three days, of Asian pollution influence on western U.S. air quality.

Source: Journal of Geophysical Research-Atmospheres, doi:10.1029/2011JD016961, 2012 http://dx.doi.org/10.1029/2011JD016961

Title: Transport of Asian ozone pollution into surface air over the western United States in spring

Authors: Meiyun Lin: Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey, USA, and NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA;

Arlene M. Fiore: NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA, now at Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA;

Larry W. Horowitz: NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA;

Owen R. Cooper: Cooperative Institute for
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Contact: Kate Ramsayer
kramsayer@agu.org
202-777-7524
American Geophysical Union
Source:Eurekalert

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