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Abstract
Cold-climate urban areas often face severe air pollution events in wintertime because of residential heating and vehicle emissions into shallow surface inversion layers. Many state-of-the-art regional chemistry-transport models cannot capture the small spatio-temporal scale of the transport and chemical processes occurring in these environments.Here we introduce a new version of our one-dimensional atmospheric chemistry and transport model, PACT-1D that includes continuous exchange of atmospheric air with the interstitial air of a snow layer and a kinetic treatment of multi-phase chemical processes in air and snow. PACT-1D allows modeling and assessment of the interaction of transport, chemistry, and emissions on the time and length scales relevant to polluted wintertime environments.We use the model to analyze observations made during the ALPACA campaign (Jan. and Feb. 2022 in Fairbanks, AK, USA). Many atmospheric and snow parameters were recorded, including measurements of the vertical distribution of trace species in the atmosphere and snow. The near surface transport is constrained by a passive tracer method, using reported sulfur dioxide emissions and respective profile measurements. We present preliminary model results and analyze sources of oxidants in the snow and the influence of the snow layer on the near-surface atmospheric compositions.
Department
Earth Systems Research Center
Publication Date
11-27-2024
Journal Title
EGU General Assembly 2024
Publisher
Copernicus GmbH
Digital Object Identifier (DOI)
Document Type
Conference Proceeding
Recommended Citation
Kuhn, J., Stutz, J., Cesler-Maloney, M., Simpson, W. R., Bartels-Rausch, T., Roberts, T. J., Thomas, J. L., Dibb, J., Heinlein, L., Sunday, M. O., Anastasio, C., Fahey, K., Flynn, J. H., and Guo, F.: A study of the near-surface vertical distribution and chemistry of pollutants in cold-climate urban areas with the novel PACT-1D model, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13109, https://doi.org/10.5194/egusphere-egu24-13109, 2024.
Rights
© Author(s) 2025.
Comments
This is an open access article published by Copernicus GmbH in EGU General Assembly 2024 in 2024, available online: https://dx.doi.org/10.5194/egusphere-egu24-13109