First Assessment of NOx Sources at a Regional Background Site in North China Using Isotopic Analysis Linked with Modeling

Environmental Science & Technology
Zheng ZongGan Zhang

Abstract

Nitrogen oxides (NOx, including NO and NO2) play an important role in the formation of atmospheric particles. Thus, NOx emission reduction is critical for improving air quality, especially in severely air-polluted regions (e.g., North China). In this study, the source of NOx was investigated by the isotopic composition (δ(15)N) of particulate nitrate (p-NO3(-)) at Beihuangcheng Island (BH), a regional background site in North China. It was found that the δ(15)N-NO3(-) (n = 120) values varied between -1.7‰ and +24.0‰ and the δ(18)O-NO3(-) values ranged from 49.4‰ to 103.9‰. On the basis of the Bayesian mixing model, 27.78 ± 8.89%, 36.53 ± 6.66%, 22.01 ± 6.92%, and 13.68 ± 3.16% of annual NOx could be attributed to biomass burning, coal combustion, mobile sources, and biogenic soil emissions, respectively. Seasonally, the four sources were similar in spring and fall. Biogenic soil emissions were augmented in summer in association with the hot and rainy weather. Coal combustion increased significantly in winter with other sources showing an obvious decline. This study confirmed that isotope-modeling by δ(15)N-NO3(-) is a promising tool for partitioning NOx sources and provides guidance to policymakers with regard to options for NO...Continue Reading

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Citations

Apr 9, 2020·Environmental Science and Pollution Research International·Haijuan ZhaoQigang Wang
Jun 26, 2020·Environmental Science and Pollution Research International·Yansheng CaoHuayun Xiao
Sep 23, 2018·Environmental Science and Pollution Research International·Shasha LiuZhi Tang
Dec 17, 2020·Rapid Communications in Mass Spectrometry : RCM·Hiroto KawashimaNana Suto
Jan 13, 2021·Nature Communications·Wei SongCong-Qiang Liu
Jan 29, 2019·The Science of the Total Environment·Emily M ElliottJustin G Coughlin
Jan 16, 2019·Environmental Science & Technology·Yunhua ChangJeffrey L Collett
Oct 28, 2020·Environmental Science & Technology·Zheng ZongGan Zhang
Feb 15, 2019·The Science of the Total Environment·Li LuoShuh-Ji Kao

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