Size distribution and sources of aerosol in Launceston, Australia, during winter 1997
Size distribution and sources of aerosol in Launceston, Australia, during winter 1997
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DOI：
10.1080/10473289.2000.10464022
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发表时间：
2000-03-01
影响因子：
2.7
通讯作者：
Cohen, DD
中科院分区：
文献类型：
--
作者：
Keywood, MD;Ayers, GP;Cohen, DD
作为澳大利亚细颗粒物化学和物理特性试点研究的一部分，1997 年 6 月至 7 月期间，在塔斯马尼亚州朗塞斯顿的 Ti Tree Bend 收集了一套气溶胶样本。这一时期代表南半球的仲冬，朗塞斯顿的气溶胶来源以家庭木材燃烧产生的烟雾为主。本文描述了此次测量活动的结果，旨在评估木材烟雾对环境气溶胶化学和物理特性的影响。使用微孔均匀沉积物冲击器（MOUDI）测量0.05至20μm空气动力学直径的气溶胶的尺寸分布。使用 PM2.5 锥形元件振荡微天平 (TEOM) 连续测量细颗粒质量，并使用浊度计测量 530 nm 处的光散射系数。质量尺寸分布趋于双峰，随着总质量的增加，主模直径趋于较小尺寸。非海盐钾和多环芳烃（PAH）被用作木材烟雾的化学示踪剂。人们发现木烟会增加绝对颗粒质量（足以定期超过空气质量标准），并将质量集中在低于 1 微米空气动力学直径的单一模式中。木烟源改变了气溶胶的酸碱平衡，游离酸氢离子、非海盐硫酸盐和铵浓度较高，所有物质的浓度，包括硝酸盐（不同程度），集中在细颗粒尺寸范围内。木材烟雾源也严重影响气溶胶散射效率，增加质量浓度和光散射的强烈昼夜循环。
As part of a pilot study into the chemical and physical properties of Australian fine particles, a suite of aerosol samples was collected at Ti Tree Bend in Launceston, Tasmania, during June and July 1997. This period represents midwinter in the Southern Hemisphere, a period when aerosol sources in Launceston are dominated by smoke from domestic wood burning. This paper describes the results from this measurement campaign, with the aim of assessing the effect of wood smoke on the chemical and physical characteristics of ambient aerosol. A micro orifice uniform deposit impactor (MOUDI) was used to measure the size distributions of the aerosol from 0.05 to 20 mu m aerodynamic diameter. Continuous measurements of fine particle mass were made using a PM2.5 tapered element oscillating microbalance (TEOM) and light scattering coefficients at 530 nm were measured with nephelometers.Mass size distributions tended to be bimodal, with the diameter of the dominant mode tending to smaller sizes with increases in total mass. Non-sea salt potassium and polycyclic aromatic hydrocarbons (PAHs) were used as chemical tracers for wood smoke. Wood smoke was found to increase absolute particle mass (enough to regularly exceed air quality standards), and to concentrate mass in a single mode below 1 mu m aerodynamic diameter. The acid-base equilibrium of the aerosol was altered by the wood smoke source, with free acidity hydrogen ion, non-sea salt sulfate, and ammonium concentrations being higher and the concentration of all species, including nitrate (to differing extents), focused in the fine particle size ranges. The wood smoke source also heavily influenced the aerosol scattering efficiency, adding to a strong diurnal cycle in both mass concentration and light scattering.