Investigation of sources of volatile organic carbon in the Baltimore area using highly time-resolved measurements
Investigation of sources of volatile organic carbon in the Baltimore area using highly time-resolved measurements
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DOI：
10.1016/j.atmosenv.2003.10.004
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发表时间：
2004-02
影响因子：
5
通讯作者：
Yu-Jin Choi;S. Ehrman
中科院分区：
文献类型：
--
作者：
Yu-Jin Choi;S. Ehrman
一个多变量的受体模型，ECOX，适用于每小时的挥发性有机烃浓度测定在光化学评估监测站，位于马里兰州的巴尔的摩地区，在1996年至1999年的夏季。确定了六种可能的挥发性有机碳源类别，与汽油相关的来源，如汽车尾气，汽油蒸气和液体汽油贡献了总VOC浓度的一半以上。天然气，表面涂层，和生物源类别占总挥发性有机化合物的13%，12%和11%，分别考虑时，所有每小时的测量。为了研究每个源类别和臭氧浓度升高事件之间可能存在的关系，NOx，气象变量，如地面风速和温度，以及每个源类别的每小时贡献，从OVX获得，分为高臭氧日和低臭氧日。高臭氧日与低臭氧日的每一个源类别的昼夜模式的比较结果表明，生物源排放可能有显着的贡献，当地的臭氧生产过程中，违反了8小时臭氧标准在这方面。
A multivariate receptor model, UNMIX, was applied to hourly volatile organic hydrocarbon concentrations measured at a Photochemical Assessment Monitoring Station, located in the Baltimore, MD area, during the summer months from 1996 to 1999. Six possible volatile organic carbon source categories were identified, and gasoline-related sources such as vehicle exhaust, gasoline vapor, and liquid gasoline contributed more than half of the total VOC concentration. Natural gas, surface coatings, and biogenic source categories accounted for 13%, 12% and 11% of the total VOC, respectively, when all hourly measurements are considered. In order to investigate possible relationships between each source category and episodes of elevated ozone concentrations, NOx, meteorological variables such as surface wind speed, and temperature as well as the hourly contribution of each source category, obtained from UNMIX, were split into high ozone days and low ozone days. Results of a comparison of diurnal patterns observed on high-ozone days with those of low-ozone days for each source category suggested that biogenic emissions may have contributed significantly to local ozone production during episodes in which the 8h ozone standard was violated in this area.