Comment on egusphere-2023-500 Article Swipe
Abstract. The nitrogen stable isotope composition (δ15N) of nitrogen oxides (NOx) is a powerful indicator for source apportionment of atmospheric NOx; however, δ15N–NOx values emitted from ships have not been reported, affecting the accuracy of source partitioning of atmospheric NOx in coastal zones with a lot of ocean vessel activity. This study systemically analyzed the δ15N–NOx variability and main influencing factors of ship emissions. Results showed that δ15N–NOx values from ships ranged from −35.8 ‰ to 2.04 ‰ with a mean ± standard deviation of −18.5 ± 10.9 ‰. The δ15N–NOx values increased monotonically with the ongoing tightening of emission regulations, presenting a significantly negative logarithmic relationship with NOx concentrations (p < 0.01). The selective catalytic reduction (SCR) system was the most important factor affecting changes in δ15N–NOx values, compared with fuel types and operation states of ships. Based on the relationship between δ15N–NOx values and emission regulations observed in this investigation, the temporal variation in δ15N–NOx values from ship emissions in the international merchant fleet was evaluated by developing a mass-weighted model. These simulated δ15N–NOx values can be used to select suitable δ15N–NOx values for a more accurate assessment of the contribution of ship-emitted exhaust to atmospheric NOx.
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- Type
- peer-review
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- en
- Landing Page
- https://doi.org/10.5194/egusphere-2023-500-ac1
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https://openalex.org/W4385830274Canonical identifier for this work in OpenAlex
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https://doi.org/10.5194/egusphere-2023-500-ac1Digital Object Identifier
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Comment on egusphere-2023-500Work title
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peer-reviewOpenAlex work type
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enPrimary language
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2023Year of publication
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2023-08-15Full publication date if available
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Chongguo TianList of authors in order
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https://doi.org/10.5194/egusphere-2023-500-ac1Publisher landing page
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.5194/egusphere-2023-500-ac1Direct OA link when available
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Delta, Nitrogen oxides, Analytical Chemistry (journal), Nitrogen, Physics, Chemistry, Environmental chemistry, Waste management, Engineering, Quantum mechanics, AstronomyTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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38Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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