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首页> 外文期刊>Atmospheric chemistry and physics >Source apportionment of PM_(2.5) in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements
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Source apportionment of PM_(2.5) in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements

机译：结合使用单颗粒质谱和定量半连续测量技术，对爱尔兰科克港的PM_（2.5）进行源分配

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摘要

An aerosol time-of-flight mass spectrometer (ATOFMS) was deployed for the measurement of the size resolved chemical composition of single particles at a site in Cork Harbour, Ireland for three weeks in August 2008. The ATOFMS was co-located with a suite of semi-continuous instrumentation for the measurement of particle number, elemental carbon (EC), organic carbon (OC), sulfate and particulate matter smaller than 2.5 μm in diameter (PM_(2.5)). The temporality of the ambient ATOFMS particle classes was subsequently used in conjunction with the semi-continuous measurements to apportion PM_(2.5) mass using positive matrix factorisation. The synergy of the single particle classification procedure and positive matrix factorisation allowed for the identification of six factors, corresponding to vehicular traffic, marine, long-range transport, various combustion, domestic solid fuel combustion and shipping traffic with estimated contributions to the measured PM_(2.5) mass of 23%, 14%, 13%, 11%, 5% and 1.5% respectively. Shipping traffic was found to contribute 18% of the measured particle number (20-600 nm mobility diameter), and thus may have important implications for human health considering the size and composition of ship exhaust particles. The positive matrix factorisation procedure enabled a more refined interpretation of the single particle results by providing source contributions to PM_(2.5) mass, while the single particle data enabled the identification of additional factors not possible with typical semi-continuous measurements, including local shipping traffic.
机译：于2008年8月在爱尔兰科克港的一个地点部署了一个气溶胶飞行时间质谱仪（ATOFMS），用于测量尺寸分辨的单个颗粒的化学成分。该ATOFMS与一套套件位于同一地点半连续仪器的测量，用于测量粒径小于2.5μm的颗粒数，元素碳（EC），有机碳（OC），硫酸盐和颗粒物（PM_（2.5））。随后将环境ATOFMS粒子类别的时间性与半连续测量结合使用正矩阵分解法分配PM_（2.5）质量。单颗粒分类程序和正矩阵分解的协同作用可以识别六个因素，分别对应于车辆交通，海洋，远程运输，各种燃烧，国内固体燃料燃烧和运输交通，并对测得的PM_有贡献2.5）质量分别为23％，14％，13％，11％，5％和1.5％。发现船舶交通量占所测量颗粒数的18％（迁移直径20-600 nm），因此考虑到船舶尾气颗粒的大小和成分，可能对人类健康产生重要影响。正矩阵分解程序通过提供对PM_（2.5）质量的贡献，可以对单粒子结果进行更精细的解释，而单粒子数据可以识别典型的半连续测量无法实现的其他因素，包括本地运输量。

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