Optical properties of size-resolved particles at a Hong Kong urban site during winter
Optical properties of size-resolved particles at a Hong Kong urban site during winter
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香港城市冬季尺寸分辨粒子的光学特性
DOI：
10.1016/j.atmosres.2014.10.020
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发表时间：
2015-03
影响因子：
5.5
通讯作者：
Zhang, Y. Y.
中科院分区：
文献类型：
--
作者：
Lai, S. C.;Lee, S. C.;Yau, P. S.;Huang, Y.;Cheng, Y.;Wang, T.;Xu, Z.;Yuan, C.;Zhang, Y. Y.
香港的能见度下降与严重的空气污染问题有关。为了研究气溶胶的光学特性及其与粒子的化学组成和粒径分布的关系，于初冬（2010年10月至12月）在城市站点进行了监测活动。测量了颗粒的光散射系数（Bsp）和吸收系数（Bap）。使用标称50%截止空气动力学直径为18、10、5.6、3.2、1.8、1、0.56、0.32、0.18、0.1和0.056 μm的两个并置微孔均匀存款撞击式采样器（MOUDI 110，MSP，USA）收集粒度分辨颗粒样品。平均Bsp和Bap分别为201.96 ± 105.82 Mm− 1和39.91 ± 19.16 Mm− 1，平均单次散射的散射系数ωo为0.82 ± 0.07。采用消光系数的理论计算方法，对粒径分辨颗粒物（PM）的消光系数进行了计算。重建的光散射系数与香港市区的实测散射值相关良好。液滴模式（0.56-1.8 μm）粒子对粒子消光的贡献最大（~ 69%）。有机物、硫酸铵和元素碳是造成液滴（0.56-1.8 μm）和凝结（0.1-0.56 μm）粒径范围内能见度下降的主要成分。使用正矩阵因子分解（PMF）确定了五个导致粒子消光的来源。交通/发动机废气和二次气溶胶分别占颗粒消光的约36%和约32%，其次是海盐（15%）。其余的来源，土壤/扬尘和轮胎粉尘，分别贡献了约10%和7%，粒子消光。
Visibility degradation in Hong Kong is related to the city's serious air pollution problems. To investigate the aerosols' optical properties and their relationship with the chemical composition and size distribution of the particles, a monitoring campaign was conducted at an urban site in the early winter period (from October to December, 2010). The particle light scattering coefficient (Bsp) and absorption coefficient (Bap) were measured. Two collocated Micro-Orifice Uniform Deposit Impactor samplers (MOUDI110, MSP, USA) with nominal 50% cut-off aerodynamic diameters of 18, 10, 5.6, 3.2, 1.8, 1, 0.56, 0.32, 0.18, 0.1, and 0.056 μm were used to collect size-resolved particle samples. The average Bspand Bapwere 201.96 ± 105.82 Mm− 1and 39.91 ± 19.16 Mm− 1, with an average single scattering albedo (ωo) of 0.82 ± 0.07. The theoretical method of light extinction calculation was used to determine the extinction of the size-resolved particulate matters (PM). The reconstructed light scattering coefficient correlated well with the measured scattering value in the Hong Kong urban area. Droplet mode (0.56–1.8 μm) particles contributed most to the particle light extinction (~ 69%). Organic matter, ammonium sulphate and elemental carbon were the key components causing visibility degradation in the droplet (0.56–1.8 μm) and condensation (0.1–0.56 μm) size ranges. Five sources contributing to particle light extinction have been identified using positive matrix factorisation (PMF). Traffic/engine exhausts and secondary aerosols accounted for ~ 36% and ~ 32% of particle light extinction, respectively, followed by sea salt (15%). The remaining sources, soil/fugitive dust and tire dust, contributed by ~ 10% and 7%, respectively, to particle light extinction.
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DOI：
10.1016/j.atmosenv.2012.09.051
发表时间：
2012-10
期刊：
Atmospheric Environment (Oxford, England : 1994)
影响因子：
--
作者：
Z. Ling;Hai Guo;Junyu Zheng;P. Louie;Hairong Cheng;Fei Jiang;Kalam Cheung;L. C. Wong;
通讯作者：
Z. Ling;Hai Guo;Junyu Zheng;P. Louie;Hairong Cheng;Fei Jiang;Kalam Cheung;L. C. Wong;
影响因子：
5.5
作者：
Xu, Junwei;Tao, Jun;Zhang, Renjian;Cheng, Tiantao;Leng, Chunpeng;Chen, Jianmin;Huang, Guanghan;Li, Xiang;Zhu, Zhaoqin
通讯作者：
Zhu, Zhaoqin
DOI：
10.1300/j106v13n02_02
发表时间：
1999-08
期刊：
The American Journal of Psychoanalysis
影响因子：
--
作者：
Ma James Sauer Mls
通讯作者：
Ma James Sauer Mls
影响因子：
5
作者：
Chow, Judith C.;Watson, John G.;Motallebi, Nehzat
通讯作者：
Motallebi, Nehzat
影响因子：
6.3
作者：
J. Han;K. Moon;S. J. Lee;Y. J. Kim;S. Ryu;S. S. Cliff-S.;S. Yi
通讯作者：
J. Han;K. Moon;S. J. Lee;Y. J. Kim;S. Ryu;S. S. Cliff-S.;S. Yi