University of Cambridge > Talks.cam > Centre for Atmospheric Science seminars, Chemistry Dept. > Dual air quality benefit of SO2 emission controls by decreasing sulfate and biogenic secondary organic aerosol

Dual air quality benefit of SO2 emission controls by decreasing sulfate and biogenic secondary organic aerosol

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Air quality policy to decrease fine particles (PM2.5) hazardous to human health has mainly targeted sulfate aerosol through controls on sulfur dioxide (SO2) sources. In the Southeast US both sulfate and organic aerosol (OA) have declined, but the cause of the OA trend is uncertain. I will show with surface, aircraft and satellite observations and an atmospheric chemistry model that decline in anthropogenic sulfate is responsible for the decline in OA by concurrently decreasing sulfate and secondary organic aerosol (SOA) from biogenic sources. This provides support for a dual benefit of SO2 emission controls and is a harbinger of doom for the tropics as high biogenic emissions and an appetite for fossil fuels similar to the US may have devastating effects on air quality there.

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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