Comparison between sample-species specific uncertainties and estimated uncertainties for the source apportionment of the speciation trends network data
Comparison between sample-species specific uncertainties and estimated uncertainties for the source apportionment of the speciation trends network data
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DOI：
10.1016/j.atmosenv.2006.08.023
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发表时间：
2007-01-01
影响因子：
5
通讯作者：
Hopke, Philip K.
中科院分区：
文献类型：
--
作者：
Kim, Eugene;Hopke, Philip K.
为了将美国环境保护局的物种形成趋势网络(STN)数据用于正矩阵因式分解(PMF)的来源解析研究，每个测量数据点的不确定度是必需的。由于STN数据在2003年7月之前没有伴随样本物种特定的不确定度(SSU)，Kim等人估计了一组全面的分数不确定度。[2005年。用于来源解析的物种形成趋势网络数据的有机碳空白值和误差结构的估计。空气和废物管理协会学报55,1190-1199]。这项研究的目的是比较在STN监测点测量的PM2.5(空气动力学直径小于2.5微米的颗粒物)源解析中使用的估计分数不确定度(EFU)与使用SSU获得的结果。因此，进行了STN PM2.5数据的来源解析，并通过对两个选定的STN站点--新泽西州伊丽莎白和马里兰州巴尔的摩的PMF应用PMF，对X射线荧光测量的元素同时使用SSU和EFU来估计它们的贡献。在两个监测点使用EFU的PMF解析因子分布和贡献与使用SSU的相似。归一化浓度的比较表明，STN SSU没有被很好地估计。这项研究支持对STN样本使用EFU，为STN数据的来源解析研究提供有用的误差结构。(C)2006爱思唯尔有限公司。保留所有权利。
In order to use the US Environmental Protection Agency's speciation trends networks (STN) data in source apportionment studies with positive matrix factorization (PMF), uncertainties for each of the measured data points are required. Since STN data were not accompanied by sample-species specific uncertainties (SSU) prior to July 2003, a comprehensive set of fractional uncertainties was estimated by Kim et al. [2005. Estimation of organic carbon blank values and error structures of the speciation trends network data for source apportionments. Journal of Air and Waste Management Association 55, 1190-1199]. The objective of this study is to compare the use of the estimated fractional uncertainties (EFU) for the source apportionment of PM2.5 (particulate matter less than 2.5 mu m in aerodynamic diameter) measured at the STN monitoring sites with the results obtained using SSU. Thus, the source apportionment of STN PM2.5 data were performed and their contributions were estimated through the application of PMF for two selected STN sites, Elizabeth, NJ and Baltimore, MD with both SSU and EFU for the elements measured by X-ray fluorescence. The PMF resolved factor profiles and contributions using EFU were similar to those using SSU at both monitoring sites. The comparisons of normalized concentrations indicated that the STN SSU were not well estimated. This study supports the use of EFU for the STN samples to provide useful error structure for the source apportionment studies of the STN data. (c) 2006 Elsevier Ltd. All rights reserved.