Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 14, 2679-2698, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
14 Mar 2014
Atmospheric peroxyacetyl nitrate (PAN): a global budget and source attribution
E. V. Fischer1, D. J. Jacob2, R. M. Yantosca2, M. P. Sulprizio2, D. B. Millet3, J. Mao4, F. Paulot1, H. B. Singh5, A. Roiger6, L. Ries7, R.W. Talbot8, K. Dzepina9, and S. Pandey Deolal10 1Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA
2School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
3Department of Soil, Water and Climate, University of Minnesota, St. Paul, MN, USA
4Princeton University, GFDL, Princeton, NJ, USA
5NASA Ames Research Center, Moffett Field, CA, USA
6Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
7Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
8Federal Environment Agency, GAW Global Station Zugspitze/Hohenpeissenberg, Zugspitze, Germany
9Department of Chemistry, Michigan Technological University, Houghton, MI, USA
10Bluesign Technologies AG, St. Gallen, Switzerland
Abstract. Peroxyacetyl nitrate (PAN) formed in the atmospheric oxidation of non-methane volatile organic compounds (NMVOCs) is the principal tropospheric reservoir for nitrogen oxide radicals (NOx = NO + NO2). PAN enables the transport and release of NOx to the remote troposphere with major implications for the global distributions of ozone and OH, the main tropospheric oxidants. Simulation of PAN is a challenge for global models because of the dependence of PAN on vertical transport as well as complex and uncertain NMVOC sources and chemistry. Here we use an improved representation of NMVOCs in a global 3-D chemical transport model (GEOS-Chem) and show that it can simulate PAN observations from aircraft campaigns worldwide. The immediate carbonyl precursors for PAN formation include acetaldehyde (44% of the global source), methylglyoxal (30%), acetone (7%), and a suite of other isoprene and terpene oxidation products (19%). A diversity of NMVOC emissions is responsible for PAN formation globally including isoprene (37%) and alkanes (14%). Anthropogenic sources are dominant in the extratropical Northern Hemisphere outside the growing season. Open fires appear to play little role except at high northern latitudes in spring, although results are very sensitive to plume chemistry and plume rise. Lightning NOx is the dominant contributor to the observed PAN maximum in the free troposphere over the South Atlantic.

Citation: Fischer, E. V., Jacob, D. J., Yantosca, R. M., Sulprizio, M. P., Millet, D. B., Mao, J., Paulot, F., Singh, H. B., Roiger, A., Ries, L., Talbot, R. W., Dzepina, K., and Pandey Deolal, S.: Atmospheric peroxyacetyl nitrate (PAN): a global budget and source attribution, Atmos. Chem. Phys., 14, 2679-2698,, 2014.
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