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HYSPLIT helps protect community during hazardous chemical release

May 16, 2025

An incident in Milwaukie, OR last week highlighted the impact the Air Resources Laboratory HYSPLIT model has in emergency management. On May 10th, the fire department in Clackamas responded to an incident at a manufacturing facility, involving a chemical reaction that produced hydrogen gas.

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Lee, T. R., Pal, S., Meyers, T. P., Krishnan, P., Hirth, B., Heuer, M., Saylor, R. D., Kochendorfer, J., and Schroeder, J. (2025). Impact of the Bowen ratio on surface-layer parameterizations of heat, moisture, and turbulent Fluxes in drylands. Journal of Applied Meteorology and Climatology, 64, 549–568. https://doi.org/10.1175/JAMC-D-24-0075.1.

Hung, W.-T., Campbell, P. C., Moon, Z., Saylor, R., Kochendorfer, J., Lee, T. R., & Massman, W. (2024). Evaluation of an in-canopy wind and wind adjustment factor model for wildfire spread applications across scales. Journal of Advances in Modeling Earth Systems, 16, e2024MS004300. https://doi.org/10.1029/2024MS004300 https://doi.org/10.1080/10962247.2024.2393178

Tang, B., Stanier, C. O., Carmichael, G. R. & Gao, M. (2024). Ozone, nitrogen dioxide, and PM2.5 estimation from observation-model machine learning fusion over D. Korea: Influence of observation density, chemical transport model resolution, and geostationary remotely sensed AOD. Atmospheric Environment, 331, 120603. https://doi.org/10.1016/j.atmosenv.2024.120603

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