An evaluation of interagency monitoring of protected visual environments (IMPROVE) collocated precision and uncertainty estimates
An evaluation of interagency monitoring of protected visual environments (IMPROVE) collocated precision and uncertainty estimates
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DOI：
10.1016/j.atmosenv.2007.06.053
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发表时间：
2008-04-01
影响因子：
5
通讯作者：
White, Warren H.
中科院分区：
文献类型：
--
作者：
Hyslop, Nicole P.;White, Warren H.
受保护视觉环境的机构间监测（IMPROVE）计划是美国的一项合作测量工作，旨在描述风景区（主要是国家公园和森林）目前的能见度和气溶胶状况，并确定造成现有人为能见度损害的化学物质和排放源。2003年和2004年，IMPROVE网络开始在多个站点运行配置采样器，以评估其气溶胶测量的精度，本文介绍了根据美国环境保护署的指南联邦法规[CFR，1997]计算的精度。PM（2.5）和颗粒物环境空气质量监测的参考和等效方法指定的修订要求：最终规则，1997年。联邦法规。第四部分：环境保护局，第40卷，CFR第53和58部分，第40页。71-72.可用]。这些值的范围从硫酸盐的4%到第三元素碳部分的115%。并置精度倾向于随着检测率的增加而提高，当对整个过滤器而不是仅对过滤器的一部分进行分析时通常更好，并且对于主要在较小尺寸部分中的物质更好。配置精密度还用于评价浓度常规报告的不确定度估计值的准确度。对于大多数物种，配置的精度比所报告的不确定性预测的精度差。这些差异表明，一些不确定性的来源没有得到考虑或被低估。(C)2007爱思唯尔有限公司保留所有权利。
The Interagency Monitoring of Protected Visual Environments (IMPROVE) program is a cooperative measurement effort in the United States designed to characterize current visibility and aerosol conditions in scenic areas (primarily National Parks and Forests) and to identify chemical species and emission sources responsible for existing man-made visibility impairment. In 2003 and 2004, the IMPROVE network began operating collocated samplers at several sites to evaluate the precision of its aerosol measurements.This paper presents the precisions calculated from the collocated data according to the United States Environmental Protection Agency's guidelines Code of Federal Regulations [CFR, 1997. Revised requirements for designation of reference and equivalent methods for PM(2.5) and ambient air quality surveillance for particulate matter: final rule, 1997. Code of Federal Regulations. Part IV: Environmental Protection Agency, vol. 40 CFR Parts 53 and 58, pp. 71-72. Available from ]. These values range from 4% for sulfate to 115% for the third elemental carbon fraction. Collocated precision tends to improve with increasing detection rates, is typically better when the analysis is performed on the whole filter instead of just a fraction of the filter, and is better for species that are predominantly in the smaller size fractions. The collocated precisions are also used to evaluate the accuracy of the uncertainty estimates that are routinely reported with the concentrations. For most species, the collocated precisions are worse than the precisions predicted by the reported uncertainties. These discrepancies suggest that some sources of uncertainty are not accounted for or have been underestimated. (C) 2007 Elsevier Ltd. All rights reserved.