Towards an understanding of the fine particle variations in the LFV: integration of chemical, physical and meteorological observations
Towards an understanding of the fine particle variations in the LFV: integration of chemical, physical and meteorological observations
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DOI：
10.1016/j.atmosenv.2004.01.056
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发表时间：
2004-11-01
影响因子：
5
通讯作者：
Hayden, K
中科院分区：
文献类型：
--
作者：
Brook, JR;Strawbridge, KB;Hayden, K
对不列颠哥伦比亚省弗雷泽河谷下部颗粒物测量的详细分析，为PM2.5观测值的升高提供了与过程有关的解释。8月24日至30日的气象条件促进了高空颗粒物的积聚，包括浓缩层。在此期间，根据PM2.5的来源、年龄和/或过程“诊断”了7个PM2.5峰值。令人感兴趣的是8月26日深夜的峰值(预计二次有机贡献较大)、8月29日下午早些时候的峰值(期间最古老的颗粒与新鲜的燃烧有机物混合)和8月30日的两个峰值。后两个峰的硫酸盐浓度升高，相隔不到3h。第一个与异质生产有关，第二个与同质生产和成核有关。本文提供的分析类型有助于识别独特的情况，以便进行更详细的流程研究。对观测到的PM2.5的成功解释需要详细的气象分析，只有每小时或更好地对颗粒进行质量量化和尺寸分辨的化学表征，再加上来自激光雷达的垂直气溶胶后向散射轮廓，才有可能。这表明，在研究影响对流层气溶胶的过程时，将这些方法放在一起是有价值的。皇冠版权所有(C)2004由爱思唯尔有限公司出版。保留所有权利。
Detailed analysis of particle measurements in the Lower Fraser Valley of British Columbia has provided process-related explanations for the elevated PM2.5 observations. The meteorological conditions from 24-30 August contributed to the build-up of particles including concentrated layers aloft. During this period, seven PM2.5 peaks were "diagnosed" based upon their origin, age and/or processes. Of interest were the peaks in the late evening of 26 August (expected large secondary organic contribution), 29 August in the early afternoon (oldest particles during the period mixed with fresh combustion organics) and two peaks on 30 August. These latter two peaks showed elevated sulphate and were less than 3 h apart. The first was related to heterogeneous production and the second homogeneous production and nucleation. The type of analysis presented in this paper helps to identify unique situations for more detailed process studies. Successful interpretation of the observed PM2.5 required detailed meteorological analyses and was only possible with hourly or better mass quantification and size-resolved chemical characterization of the particles plus vertical aerosol backscatter profiles from LIDAR. This demonstrates the value of co-locating these approaches in the study of the processes influencing tropospheric aerosols. Crown Copyright (C) 2004 Published by Elsevier Ltd. All rights reserved.