Articles | Volume 23, issue 19
https://doi.org/10.5194/acp-23-12851-2023
https://doi.org/10.5194/acp-23-12851-2023
Research article
 | 
13 Oct 2023
Research article |  | 13 Oct 2023

Characterization of the nitrogen stable isotope composition (δ15N) of ship-emitted NOx

Zeyu Sun, Zheng Zong, Yang Tan, Chongguo Tian, Zeyu Liu, Fan Zhang, Rong Sun, Yingjun Chen, Jun Li, and Gan Zhang

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Short summary
This is the first report of ship-emitted nitrogen stable isotope composition (δ15N) of nitrogen oxides (NOx). The results showed that δ15N–NOx from ships was −18.5 ± 10.9 ‰ and increased monotonically with tightening emission regulations. The selective catalytic reduction system was the most vital factor. The temporal variation in δ15N–NOx was evaluated and can be used to select suitable δ15N–NOx for a more accurate assessment of the contribution of ship-emitted exhaust to atmospheric NOx.
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