Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 8
Articles | Volume 26, issue 8
https://doi.org/10.5194/acp-26-5799-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-5799-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 8
Technical note
 | 
28 Apr 2026
Technical note |  | 28 Apr 2026

Technical note: Quantifying the nitrogen isotope difference between ammonium in the atmosphere and ammonia emitted from sources

Chongguo Tian, Xuehua Yin, Xuena Yang, Xiaoxia Yu, Zhengjie Li, Zheng Zong, Xinpeng Tian, Yuchen Li, Roland Kallenborn, and Yi-Fan Li

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Short summary
This study explores the neglected role of atmospheric deposition in δ15N4a-3s (δ15N difference between NH4+ and source NH3), a key parameter in atmospheric NH4+ source tracing. We develop an integrated model coupling these two processes and find that the difference in δ15N4a-3s between the combined effect and the pure fractionation scenario increases with f (NH4+/NHx molar ratio). This work provides a new idea for precise NH4+ source partitioning.
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