Articles | Volume 22, issue 19
https://doi.org/10.5194/acp-22-12749-2022
https://doi.org/10.5194/acp-22-12749-2022
Research article
 | 
30 Sep 2022
Research article |  | 30 Sep 2022

Long-term regional trends of nitrogen and sulfur deposition in the United States from 2002 to 2017

Sarah E. Benish, Jesse O. Bash, Kristen M. Foley, K. Wyat Appel, Christian Hogrefe, Robert Gilliam, and George Pouliot

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Cited articles

Ackerman, D., Millet, D. B., and Chen, X.: Global Estimates of Inorganic Nitrogen Deposition Across Four Decades, Global Biogeochem. Cy., 33, 100–107, https://doi.org/10.1029/2018gb005990, 2019. 
Appel, K. W., Foley, K. M., Bash, J. O., Pinder, R. W., Dennis, R. L., Allen, D. J., and Pickering, K.: A multi-resolution assessment of the Community Multiscale Air Quality (CMAQ) model v4.7 wet deposition estimates for 2002–2006, Geosci. Model Dev., 4, 357–371, https://doi.org/10.5194/gmd-4-357-2011, 2011. 
Beck, J., Brown, J., Dudhia, J., Gill, D., Hertneky, T., Klemp, J., Wang, W., Williams, C., Hu, M., James, E., Kenyon, J., Smirnova, T., and Kim, J.-H.: An Evaluation of a Hybrid, Terrain-Following Vertical Coordinate in the WRF-Based RAP and HRRR Models, Weather Forecast., 35, 1081–1096, https://doi.org/10.1175/waf-d-19-0146.1, 2020. 
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We assess Community Multiscale Air Quality (CMAQ) model simulations of nitrogen and sulfur deposition over US climate regions to evaluate the model ability to reproduce long-term deposition trends and total deposition budgets. A measurement–model fusion technique is found to improve estimates of wet deposition. Emission controls set by the Clean Air Act successfully decreased oxidized nitrogen deposition across the US; we find increasing amounts of reduced nitrogen to the total nitrogen budget.
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