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Title of Journal: Adv Atmos Sci

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Abbravation: Advances in Atmospheric Sciences

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SP Science Press

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DOI

10.1007/bf02599053

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1861-9533

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Temporal variability in fine carbonaceous aerosol

Authors: Fumo Yang Jeffrey Brook Kebin He Fengkui Duan Yongliang Ma
Publish Date: 2010/04/21
Volume: 27, Issue: 3, Pages: 705-714
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Abstract

Timeseries of weekly total carbon TC concentrations of fine aerosol particles PM25 in Beijing and Toronto were compared to investigate their respective levels and temporal patterns over two years from August 2001 through July 2003 In addition to this comparison differences in the factors contributing to the observed concentrations and their temporal variations are discussed Based upon past knowledge about the two megacities with highly contrasting air pollutant levels it is not surprising that the average TC concentration in Beijing 315 µg C m−3 was greater than that in Toronto by a factor of 83 Despite their large concentration differences in both cities TC comprised a similarly large component of PM25 TC concentrations exhibited very different seasonal patterns between the two cities In Beijing TC experienced higher levels and greater weekly fluctuations in winter whereas in Toronto this behavior was seen in summer As a result the greatest gap in TC concentrations between Beijing and Toronto by a factor of 127 occurred in winter while the smallest gap a factor of 46 was in summer In Beijing seasonal variations in the emissions probably played a greater role than meteorology in influencing the TC seasonality while in Toronto during the warm months more than 80 of the hourly winds were recorded from the south along with many potential anthropogenic sources for the days with high TC concentrations This comparison of the differences provides insight into the major factors affecting carbonaceous aerosol in each city

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  10. Dominant cloud microphysical processes of a torrential rainfall event in Sichuan, China
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