Evolution of Acyl Peroxynitrates (PANs) in wildfire smoke plumes detected by the Cross-track Infrared Sounder (CrIS) over the Western U.S. during summer 2018

We use observations of acyl peroxynitrates (PANs) from the Cross-Track Infrared Sounder (CrIS) to investigate PANs over the western U.S. during the summer 2018 wildfire season. This period coincides with the Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE-CAN). When combined with favorable background conditions, the resolution and sensitivity of CrIS is sufficient to observe the production of PANs in smoke plumes. CrIS PANs normalized excess mixing ratios with respect to CO (NEMRs) in the Pole Creek Fire increase from 0.2% to 0.4% within 3-4 hr of physical aging, consistent with in situ NEMRs. CrIS is also able to detect PANs enhancements in plumes that have been transported hours to days downwind. On average for summer 2018, 19-56% of PANs in the free troposphere during the afternoon over the western U.S. can be attributed to smoke.

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Related Dataset #1 : Cross-Track Infrared Sounder (CrIS) Peroxyacetyl Nitrate (PAN) and Carbon Monoxide (CO) retrievals for the 2018 wildfire season over the western U.S.

Related Dataset #2 : Suomi NPP CrIS Level 1B Full Spectral Resolution V2
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Author Juncosa Calahorrano, J. F.
Payne, V. H.
Kulawik, S.
Ford, B.
Flocke, Frank M.
Campos, Teresa
Fischer, E. V.
Publisher UCAR/NCAR - Library
Publication Date 2021-12-16T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-07-11T16:08:44.836365
Metadata Record Identifier edu.ucar.opensky::articles:24957
Metadata Language eng; USA
Suggested Citation Juncosa Calahorrano, J. F., Payne, V. H., Kulawik, S., Ford, B., Flocke, Frank M., Campos, Teresa, Fischer, E. V.. (2021). Evolution of Acyl Peroxynitrates (PANs) in wildfire smoke plumes detected by the Cross-track Infrared Sounder (CrIS) over the Western U.S. during summer 2018. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7z03cpg. Accessed 05 August 2025.

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