TY - JOUR
T1 - First Assessment of NOx Sources at a Regional Background Site in North China Using Isotopic Analysis Linked with Modeling
AU - Zong, Zheng
AU - Wang, Xiaoping
AU - Tian, Chongguo
AU - Chen, Yingjun
AU - Fang, Yunting
AU - Zhang, Fan
AU - Li, Cheng
AU - Sun, Jianzhong
AU - Li, Jun
AU - Zhang, Gan
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/6/6
Y1 - 2017/6/6
N2 - 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 (δ15N) of particulate nitrate (p-NO3-) at Beihuangcheng Island (BH), a regional background site in North China. It was found that the δ15N-NO3- (n = 120) values varied between -1.7‰ and +24.0‰ and the δ18O-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 δ15N-NO3- is a promising tool for partitioning NOx sources and provides guidance to policymakers with regard to options for NOx reduction in North China.
AB - 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 (δ15N) of particulate nitrate (p-NO3-) at Beihuangcheng Island (BH), a regional background site in North China. It was found that the δ15N-NO3- (n = 120) values varied between -1.7‰ and +24.0‰ and the δ18O-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 δ15N-NO3- is a promising tool for partitioning NOx sources and provides guidance to policymakers with regard to options for NOx reduction in North China.
UR - https://www.scopus.com/pages/publications/85020884709
U2 - 10.1021/acs.est.6b06316
DO - 10.1021/acs.est.6b06316
M3 - 文章
C2 - 28516763
AN - SCOPUS:85020884709
SN - 0013-936X
VL - 51
SP - 5923
EP - 5931
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 11
ER -