References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-9-24629-2009

Temporal variation of elemental carbon in Guangzhou, China, in summer 2006

Verma

R. L.

¹ Sahu

L. K.

¹ Kondo

¹ Takegawa

¹ Han

¹ Jung

J. S.

² Kim

Y. J.

² Fan

³ Sugimoto

⁴ Shammaa

M. H.

¹ Zhang

Y. H.

⁵ Zhao

⁶

Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan

Advanced Environmental Monitoring Research Center, Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea

Institute of Environmental Meteorology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China

Atmospheric Remote Sensing Section, National Institute for Environmental Studies, Tsukuba, Japan

State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing, China

Air Quality Research Center, University of California, Davis, USA

18 11 2009

9 6 24629 24667

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In situ measurements of the mass concentration of elemental carbon (EC) and mixing ratios of carbon monoxide (CO) and carbon dioxide (CO2) were made at Guangzhou, an urban measurement site in the Pearl River Delta (PRD), China, in July 2006. The average±standard deviation (SD) concentrations of EC, CO, and CO2 were 4.7±2.3 μg C m−3, 798±459 ppbv and 400±13 ppmv, respectively. The trends of these species were mainly controlled by synoptic-scale changes in meteorology during the campaign. Based on back trajectories, data are analyzed separately for two different air mass types representing northerly and southerly flows. Northerly air masses, constituting about 25% of the campaign, were mainly impacted by stagnant conditions, resulting in elevated levels of pollutants. On the other hand, southerly air masses measured during most of the campaign were mostly influenced by clean marine air. The diurnal patterns of EC, CO, and CO2 exhibited peak concentrations during the morning and evening hours coinciding with rush-hour traffic. The diurnal variations of EC and ΔEC/ΔCO closely followed the traffic pattern of heavy-duty vehicles (HDV) in Guangzhou, similar to that observed in Beijing. The level of EC in this campaign was similar to values reported during previous studies at other sites surrounding Guangzhou. The average slopes of ΔEC/ΔCO, ΔEC/ΔCO2, and ΔCO/ΔCO2 were 0.0054 μg C m−3/ppbv, 0.15 μg C m−3/ppmv, and 46.4 ppbv/ppmv, respectively, agreeing reasonably well with their respective emission ratios derived from regional emission inventories.

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