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Retrievals of peroxyacetyl nitrate (PAN) from FTIR ground-based solar spectra, comparison with GEOS-Chem and satellite data

par Cantos, Irene Pardo;Mahieu, Emmanuel;Fischer, Emily V.;Franco, Bruno ;Clarisse, Lieven ;Prignon, Maxime
Référence The 10th International GEOS-Chem Meeting (IGC10) (June 6-10, 2022: Washington University, St. Louis, Missouri, USA)
Publication Publié, 2022-06-07

Poster de conférence

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Résumé :

Peroxyacetyl nitrate (PAN, CH3COO2NO2) is the main tropospheric reservoir of NOx (NO + NO2). PAN is formed when non-methane volatile organic compounds (NMVOCs) oxidation products react with NOx. Anthropogenic and natural emission sources (fossil fuel combustion, biomassburning, lightning, and processes responsible for NMVOC emissions) contribute to PAN formation (Fischer et al., 2014). Its lifetime can reachseveral months in the upper cold troposphere. This enables the long-range transport of NOx radicals, under the form of PAN, far from the regions of emission (Tereszchuk et al., 2013; Fischer et al., 2014). The subsequent release of NOx through the PAN thermal decomposition leads to the efficient formation of tropospheric ozone (O3), with important consequences for tropospheric oxidative capacity and air quality. PAN total columns have been retrieved from ground-based high-resolution solar absorption Fourier transform infrared (FTIR) spectra. The developed strategy has been applied to observations recorded at remote FTIR stations of the Network for the Detection of Atmospheric Composition Change (NDACC, visit https://www.ndaccdemo.org/). The resulting datasets are compared with a GEOS-Chem (Goddard Earth Observing System) global chemical transport model (CTM) simulation and with total column time series derived from IASI (Infrared Atmospheric Sounding Interferometer) satellite observations.