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

Fang, Huan; Walters, Wendell W.; Mase, David; Michalski, Greg

doi:https://doi.org/10.5194/gmd-14-5001-2021

Articles | Volume 14, issue 8

Geosci. Model Dev., 14, 5001–5022, 2021

https://doi.org/10.5194/gmd-14-5001-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Geosci. Model Dev., 14, 5001–5022, 2021

https://doi.org/10.5194/gmd-14-5001-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 14, issue 8

Model description paper 12 Aug 2021

Model description paper | 12 Aug 2021

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

Huan Fang et al.

Supplement

https://doi.org/10.5194/gmd-14-5001-2021-supplement

Model code and software

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 (Version 1.0) Huan Fang https://doi.org/10.5281/zenodo.3834921

SboxN15 Huan Fang https://mygeohub.org/tools/sbox/

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 i_NRACM. The model is able to predict d¹⁵N variations in NO_x, HONO, and HNO₃ that are similar to those observed in aerosol and gases in the troposphere.