Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 10395-10403, 2017
https://doi.org/10.5194/acp-17-10395-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Sep 2017
The variability in the relationship between black carbon and carbon monoxide over the eastern coast of China: BC aging during transport
Qingfeng Guo1,a, Min Hu1,2, Song Guo1, Zhijun Wu1, Jianfei Peng1, and Yusheng Wu1,b 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
2Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, China
anow at: Beijing SDL Technology Co., Ltd., Beijing, China
bnow at: Department of Physics, University of Helsinki, Helsinki, Finland
Abstract. East Asia is a densely populated region with a myriad of primary emissions of pollutants such as black carbon (BC) and carbon monoxide (CO). To characterize primary emissions over the eastern coast of China, a series of field campaigns were conducted in 2011, including measurements from a ship cruise, island, and coastal receptor sites. The relationship between BC and CO is presented here for the first ship cruise (C1), the second ship cruise (C2), an island site (Changdao Island, CD), and a coastal site (Wenling, WL). The average BC mass concentrations were 2.43, 2.73, 1.09, 0.94, and 0.77 µg m−3 for CD, WL, C1-YS (Yellow Sea), C1-ES (East China Sea), and C2-ES, respectively. For those locations, the average CO mixing ratios were 0.55, 0.48, 0.31, 0.36, and 0.27 ppm. The high loadings of both BC and CO imply severe anthropogenic pollution over the eastern coast of China. Additionally, the linear correlation between BC and CO was regressed for each location. The slopes, i.e., the ratios of ΔBC to ΔCO derived from their relationship, correlated well with the ratios of diesel consumption to gasoline consumption in each province/city, which reveals vehicular emission to be the common source for BC and CO and that there are distinct fuel structures between North and South China. The ΔBC/ΔCO values at coastal sites (Changdao Island and Wenling) were much higher than those over the Yellow Sea and East China Sea, and the correlation coefficients also showed a decreasing trend from the coast to the sea. Therefore, the quantity of ΔBC/ΔCO and the correlation coefficients are possible indicators for the aging and removal of BC.

Citation: Guo, Q., Hu, M., Guo, S., Wu, Z., Peng, J., and Wu, Y.: The variability in the relationship between black carbon and carbon monoxide over the eastern coast of China: BC aging during transport, Atmos. Chem. Phys., 17, 10395-10403, https://doi.org/10.5194/acp-17-10395-2017, 2017.
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Short summary
To characterize primary emissions over the eastern coast of China, a series of field campaigns were conducted. The high loadings of both BC and CO implied severe anthropogenic pollution over the areas. The slopes between BC and CO at different areas revealed the vehicular emission as the common source and the distinct fuel structures between North and South China. The comparisons of slopes and correlation coefficient among these areas can indicate the aging extent of BC at the macroscopic level.
To characterize primary emissions over the eastern coast of China, a series of field campaigns...
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