Correlations between black carbon mass and size–resolved particle number concentrations in the Taipei urban area: A five–year long–term observation

Developmental Biology

Yu–Hsiang Cheng²  Yu–Yun Kao²  Jyh–Jian Liu¹ 

[1]Department of Environmental Monitoring and Information Management, Environmental Protection Administration, 83, Sec. 1, Zhonghua Rd, Zhongzheng, Taipei 10042, Taiwan$$

[2]Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84 Gungjuan Rd, Taishan, New Taipei 24301, Taiwan$$

关键词: Black carbon;    particle number;    photochemical nucleation;    Taipei;   

DOI  :  10.5094/APR.2014.008

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

This study investigates the correlation between Black Carbon (BC) mass and particle number concentrations in various particle size ranges in Taipei urban area. The concentrations of BC mass and particle numbers (ranging from 10–560 nm, N_10–560) were measured continuously from 2006 to 2010. Long–term measurement results of this study demonstrated that BC mass concentrations in the spring, summer, autumn, and winter were 3.3 μg m⁻³, 3.2 μg m⁻³, 2.4 μg m⁻³, and 3.1 μg m⁻³, respectively. Additionally, the N_10–560 concentrations in the spring, summer, autumn, and winter were 1.5 × 10⁴ particles cm⁻³, 1.7 × 10⁴ particles cm⁻³, 1.1 × 10⁴ particles cm⁻³, and 1.4 × 10⁴ particles cm⁻³, respectively. In the autumn, the lowest BC mass and particle number concentrations were mostly likely owing to the high wind speed condition that favored dispersion of particulate matter. Additionally, the highest particle number concentrations observed in the summer can be due to that the activities of the chemical nucleation reactions in the summer are more intense than those in other seasons. In this sampling site, the number fractions for N_10–18, N_18–32, N_32–56, N_56–100, N_100–180, N_180–320 and N_320–560 were 4.39%, 15.38%, 26.31%, 27.35%, 16.89%, 7.17% and 2.51%, respectively. Hourly BC mass concentrations are significantly positively correlated with hourly N_100–180 concentrations at the sampling site. In the summer, a clear increase in N_10–560/BC is observed during the noontime period, coincident with maximum ambient temperature. Secondary particles through the photochemical nucleation heavily impact the size range of 56–100 nm, following by 100–180 nm and 32–56 nm in this study.

【 授权许可】

Unknown   

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