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Chemical characterization and source apportionment of size-resolved particles in Hong Kong sub-urban area

机译：香港郊区的尺寸分辨颗粒的化学表征和来源分配

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摘要

Size-resolved particulate matter (PM) samples were collected with a 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI) at a sub-urban site (Tung Chung) in Hong Kong for four non-consecutive months representing four seasons from 2011 to 2012. Major chemical components were water-soluble anions (i.e., Cl-, NO3-, and SO42-), cations (i.e., NH4+, Na+, K+, and Ca2+), organic and elemental carbon and elements. Both chemical mass closure and positive matrix factorization (PMF) were employed to understand the chemical composition, resolve particle size modes, and evaluate the PM sources. Tri-modal size distributions were found for PM mass and major chemical components (e.g., SO42-, NH4+, and OC). Mass median aerodynamic diameters (MMADs) with similar standard deviations (1.32 < sigma < 1.42) were 0.4, 0.7 and 3.8 mu m, consistent with condensation, droplet and coarse modes. A bi-modal distribution peaking at condensation and droplet modes was found for EC, with a single mode peaking at 3.8 mu m for Cl-. Besides secondary SO42-, carbonaceous aerosol dominated the condensation mode with 27% by engine exhaust and 18-19% each by residual oil combustion (shipping) and coal/biomass burning. Secondary SO42- is also the most dominant component in the droplet mode, accounting for 23% of PM mass, followed by an industrial source (19%). Engine exhaust, secondary NO3-, and sea salt each accounted for 13-15% of PM mass. Sea salt and soil are the dominated sources in the coarse mode, accounting for similar to 80% of coarse mass. (C) 2015 Elsevier B.V. All rights reserved.
机译：从2011年至2011年的四个季节，在香港郊区（东涌）的一个连续十个月内，使用10级微型离心机均匀沉积物撞击器（MOUDI）收集了大小分解的颗粒物（PM）样品。 2012年。主要化学成分为水溶性阴离子（如Cl-，NO3-和SO42-），阳离子（如NH4 +，Na +，K +和Ca2 +），有机和元素碳及元素。化学质量封闭和正矩阵分解（PMF）均用于了解化学成分，解析粒径模式并评估PM来源。发现了PM质量和主要化学成分（例如SO42-，NH4 +和OC）的三峰尺寸分布。具有相似标准偏差（1.32

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  • 来源
    《Atmospheric research》 |2016年第3期|112-122|共11页
  • 作者

    Gao Yuan; Lee Shun-Cheng; Huang Yu; Chow Judith C.; Watson John G.;

  • 作者单位

    Hong Kong Polytech Univ, Res Inst Sustainable Urban Dev, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Res Inst Sustainable Urban Dev, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710075, Peoples R China;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710075, Peoples R China|Desert Res Inst, Div Atmospher Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710075, Peoples R China|Desert Res Inst, Div Atmospher Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA;

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  • 正文语种 eng
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  • 关键词

    Aerosol size distribution; Inorganic ions; Carbonaceous aerosol; MOUDI; PMF;

    机译：气溶胶粒径分布;无机离子;碳质气溶胶;MOUDI;PMF;

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