Atmos. Chem. Phys. Discuss., 13, 2877-2912, 2013
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Aircraft measurements of gases pollutants and particles during CAREBeijing-2008: distributions, characteristics and influencing factors
W. Zhang1,2, T. Zhu2, W. Yang1, Z. Bai1, Y. L. Sun3, Y. Xu1, and B. Yin1
1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
3State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Abstract. Measurements of gaseous pollutants, including ozone (O3), sulfur dioxide (SO2), nitrogen oxides (NOx = NO + NO2), carbon monoxide (CO), particle number concentrations (5.6–560 nm and 0.47–30 μm), and meteorological parameters (T, RH, P) were conducted during the Program of Campaigns of Air Quality Research in Beijing and Surrounding Region (CAREBeijing) from 27 August through 13 October 2008. The data of total 18 flights (70 h flight time) from the ground to 2100 m were obtained by a Yun-12 aircraft in the southern surrounded areas of Beijing (38° N–40° N, 114° E–118° E). This measurement was to characterize the regional variation of air pollution during and after the Olympics of 2008, the impacts of different transport direction and possible influencing factors. Results suggested that four different groups of transport sources influenced the pollution level of pollutants with the consideration of the backward trajectory analysis, including: (1) the pollutant transport of the southern direction with higher pollutants level; (2) the cleaner long-range transport of the northern or northwestern direction with lower pollutants level; (3) the transport from the eastern direction with characteristics of sea sources, i.e. middle level of gases pollutants and higher particle concentration; (4) the transport of mixing directions, i.e. lower altitudes from the pollutant transport direction or local pollution but higher altitudes from the clean transport direction. Additionally, the relatively long-lived CO was shown to be a possible transport tracer of long-range transport of northwestern direction especially on the higher altitudes. Three factors influenced the size distribution of particles, i.e. air mass transport direction, ground source emissions and meteorological influences were also discussed.

Citation: Zhang, W., Zhu, T., Yang, W., Bai, Z., Sun, Y. L., Xu, Y., and Yin, B.: Aircraft measurements of gases pollutants and particles during CAREBeijing-2008: distributions, characteristics and influencing factors, Atmos. Chem. Phys. Discuss., 13, 2877-2912, doi:10.5194/acpd-13-2877-2013, 2013.
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