Atmospheric Chemistry and Physics Discussions
www.atmos-chem-phys-discuss.net
1680-7367
1680-7375
5
1
2005
10.5194/acpd-5-217-2005
http://www.atmos-chem-phys-discuss.net/5/217/2005/
http://www.atmos-chem-phys-discuss.net/5/217/2005/acpd-5-217-2005.html
http://www.atmos-chem-phys-discuss.net/5/217/2005/acpd-5-217-2005.pdf
217
241
2005-01-14
One-year record of organic and elemental carbon in fine particles in downtown Beijing and Shanghai
F. Yang
K. He
B. Ye
X. Chen
L. Cha
S. H. Cadle
T. Chan
P. A. Mulawa
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
GM R&D Center, Chemical and Environmental Sciences Laboratory, MC 480-106-269, Warren, MI 48090, USA
Weekly PM<sub>2.5</sub> samples were collected for one year in Beijing and
Shanghai and the carbonaceous species analyzed to investigate and compare
their time series patterns and possible sources in the two biggest cities of
China. Weekly carbonaceous concentrations varied in wide ranges with 8.6–59 µg m<sup>-3</sup>
for OC and 1.5–25.4 µg m<sup>-3</sup> for EC in Beijing, and
with 5.1–38.4 µg m<sup>-3</sup> for OC and 2.3–13.0 µg m<sup>-3</sup> for EC
in Shanghai. The annual average concentrations of OC and EC in PM<sub>2.5</sub>
were 23.9 and 8.8 µg m<sup>-3</sup> in Beijing and 14.6 and 6.10 µg m<sup>-3</sup>
in Shanghai, respectively. Similar weekly variations of OC and EC
concentrations were found for both cities with much higher concentrations in
late fall through winter, probably due to enhanced emissions coupled with
unfavorable meteorological conditions. The estimated SOC accounted for high
portion of the total OC in both Beijing and Shanghai throughout the year,
indicating SOC may be an important contributor to fine organic aerosol in
these urban areas. In Beijing, the C14 analysis of limited samples suggested
there was a significant contribution of modern carbon to the total fine
carbonaceous particulate burden with higher fractions in the harvest
seasons.