Mauna Loa Erupts Sample HYSPLIT Ash simulation on 11/30. November 29, 2022. Mauna Loa, the largest active volcano on Earth, erupted on November 28, 2022. During an active eruption, NOAA’s National Weather Service and other offices continually monitor a number of conditions. The Air Resources Laboratory (ARL) developed HYSPLIT volcanic ash model is the core…
Ariel Stein Appointed ARL Director May 9, 2022 NOAA has announced Dr. Ariel Stein is appointed the Director, Air Resources Laboratory (ARL) effective May 8, 2022. Dr. Stein is currently Director of NOAA’s Global Monitoring Laboratory. Ariel has agreed to serve as Acting Director of NOAA’s Global Monitoring Laboratory (GML) until the permanent GML position…
Air Resources Lab News HYSPLIT model forecasts dangerous ash spread from chemical fire September 15, 2025 Emergency managers use ARL’s HYSPLIT model to issue shelter-in-place orders to residents around a manufacturing plant. Four different runs were performed for Warrick County officials throughout Saturday, September 6 and into Sunday. Read more Warrick County Sheriff's Office map…
ARL Leadership ARL Director: Dr. Ariel Stein Dr. Ariel Stein is currently ARL Director. Dr. Stein has extensive experience working with atmospheric transport, dispersion, and photochemical models. Previously, Ariel was a Supervisory Physical Scientist before becoming Acting Deputy Director of NOAA’s Air Resources Laboratory. Ariel has an in-depth understanding of hybrid dispersion modeling techniques including…
2021 NOAA Administrator Awards Recognize ARL Efforts in Atmospheric Research October 29, 2021 Several ARL projects and accomplishments were recognized in the NOAA Administrator’s awards during a ceremony on October 27, 2021, including two bronze medals. The highest honor award granted by the NOAA Administrator, the Department of Commerce Bronze Medal recognizes federal employees for superior performance…
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Scientific Publications Recent Publications Ahn, D.Y. , Goldberg, D.L., Liu, F., Anderson, D.C., Coombes, T., Loughner, C.P., Kiel, M., Chatterjee, A. (2025). Satellite-Based Analysis of CO2 Emissions From Global Cities: Regional, Economic, and Demographic Attributes. ADU Advances, 6(4), Article e2025AV001747. https://doi.org/10.1029/2025AV001747. Crawford, A.M., Loughner, C.P., Tong, D.Q., Stein, A.F. (2025). Reducing dependence of modeled resuspended…
Atmospheric Transport and Dispersion ARL scientists perform activities to understand the main processes that drive the transport and dispersion of harmful substances in the atmosphere, to improve the quality of our modeling tools, and to assess the uncertainties and applicability of those tools. In addition, investigations of the transport and dispersion of chemicals in the…
Transport-Dispersion Modeling Developed and maintained by ARL, HYSPLIT is the core engine of ARL’s transport-dispersion modeling activities and it is one of the most widely used models for atmospheric trajectory and dispersion calculations in the US and internationally. HYSPLIT is a complete system for computing simple air parcel trajectories as well as complex transport, dispersion,…
About ARL NOAA’s Air Resources Laboratory (ARL) conducts research on the lowest part of the atmosphere, the boundary layer, the area where we live and breathe. World-class research on the chemistry and physics of the boundary layer contributes to accurate regional and global predictions of weather and air quality, as well as climate variability. ARL…