Articles | Volume 14, issue 8
Geosci. Model Dev., 14, 5001–5022, 2021
https://doi.org/10.5194/gmd-14-5001-2021
Geosci. Model Dev., 14, 5001–5022, 2021
https://doi.org/10.5194/gmd-14-5001-2021
Model description paper
12 Aug 2021
Model description paper | 12 Aug 2021

iNRACM: incorporating 15N into the Regional Atmospheric Chemistry Mechanism (RACM) for assessing the role photochemistry plays in controlling the isotopic composition of NOx, NOy, and atmospheric nitrate

Huan Fang et al.

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Short summary
A new photochemical reaction scheme that incorporates nitrogen isotopes has been developed to simulate isotope tracers in air pollution. The model contains 16 N compounds, and 96 reactions involving N used in the Regional Atmospheric Chemistry Mechanism (RACM) were replicated using 15N in a new mechanism called iNRACM. The model is able to predict d15N variations in NOx, HONO, and HNO3 that are similar to those observed in aerosol and gases in the troposphere.