我组博士毕业生在 Atmospheric Environment 上发表文章：Shaonan Huang, Yunting Fang, Feifei Zhu, Emily M.Elliott, et al. Multiyear measurements on ¹⁵N natural abundance of precipitation nitrate at a rural forested site[J]. Atmospheric Environment, 2021, 253(1):118353.

　　文章链接：https://www.sciencedirect.com/science/article/pii/S1352231021001710 

　　Large anthropogenic NO_x emissions increase atmospheric nitrate (NO₃^-) deposition. The China's Clean Air Action has been implemented to reduce anthropogenic NO_x emissions since 2013. To examine if atmospheric NO₃^- deposition would decrease and its sources had changed as a result of this regulation, we collected the precipitation samples(n = 181) on a daily basis at a rural forested site in Northeast China from April 2014 to December 2017 and measured the concentrations and δ¹⁵N values of NO₃^-. We found annual NO₃^- deposition ranged from 6.5 to 7.3 kg N ha^-1 yr^-1 and gradually declined since 2015. The δ¹⁵N–NO₃^- spanned a large range from -17.4 to 13.1‰ with a mass-weighted mean of -3.5‰ during the study period. The δ¹⁵N–NO₃^- was higher by 10‰ in winter (3.3 ± 4.2‰) than in summer (-7.4 ± 3.9‰), which was driven by the changes of both coal combustion and soil emission. Over the study period, NO_x from coal combustion, vehicle exhaust, biomass burning and soil emission contributed 28.2 ± 11.9%, 28.8 ± 16.3%, 26.9 ± 14.7%, and 16.1 ± 7.2% to precipitation NO₃^-, respectively. We found that relative contribution of fossil fuel combustion did not decline with the China's Clean Air Action and considerable NO_x reduction at the regional scale.