Predicted impacts of heterogeneous chemical pathways on particulate sulfur over Fairbanks (Alaska), the Northern Hemisphere, and the Contiguous United States

Farrell, Sara L.; Pye, Havala O. T.; Gilliam, Robert; Pouliot, George; Huff, Deanna; Sarwar, Golam; Vizuete, William; Briggs, Nicole; Duan, Fengkui; Ma, Tao; Zhang, Shuping; Fahey, Kathleen

doi:https://doi.org/10.5194/acp-25-3287-2025

Articles | Volume 25, issue 5

https://doi.org/10.5194/acp-25-3287-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-3287-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 5

Research article

|

18 Mar 2025

Research article |

| 18 Mar 2025

Predicted impacts of heterogeneous chemical pathways on particulate sulfur over Fairbanks (Alaska), the Northern Hemisphere, and the Contiguous United States

Sara L. Farrell, Havala O. T. Pye, Robert Gilliam, George Pouliot, Deanna Huff, Golam Sarwar, William Vizuete, Nicole Briggs, Fengkui Duan, Tao Ma, Shuping Zhang, and Kathleen Fahey

Supplement

https://doi.org/10.5194/acp-25-3287-2025-supplement

Data sets

Data For: Predicted impacts of heterogeneous chemical pathways on particulate sulfur over Fairbanks, Alaska, the N. Hemisphere, and the Contiguous United States USEPA https://doi.org/10.23719/1530692

Model code and software

Data For: Predicted impacts of heterogeneous chemical pathways on particulate sulfur over Fairbanks, Alaska, the N. Hemisphere, and the Contiguous United States USEPA https://doi.org/10.23719/1530692

The Community Scale Air Quality Model (CMAQ) version 5.3.2 USEPA Office of Research and Development https://doi.org/10.5281/zenodo.4081737

Download

Article (6799 KB)
Full-text XML

Short summary

In this work we implement heterogeneous sulfur chemistry into the Community Multiscale Air Quality (CMAQ) model. This new chemistry accounts for the formation of sulfate via aqueous oxidation of SO₂ in aerosol liquid water and the formation of hydroxymethanesulfonate (HMS) – often confused by measurement techniques as sulfate. Model performance in predicting sulfur PM_2.5 in Fairbanks, Alaska, and other places that experience dark and cold winters is improved.