Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 2 2009 10.5194/acp-9-615-2009 http://www.atmos-chem-phys.net/9/615/2009/ http://www.atmos-chem-phys.net/9/615/2009/acp-9-615-2009.html http://www.atmos-chem-phys.net/9/615/2009/acp-9-615-2009.pdf 615 634 2009-01-27 Eddy covariance fluxes of acyl peroxy nitrates (PAN, PPN and MPAN) above a Ponderosa pine forest G. M. Wolfe J. A. Thornton thornton@atmos.washington.edu R. L. N. Yatavelli M. McKay A. H. Goldstein B. LaFranchi K.-E. Min R. C. Cohen Department of Chemistry, University of Washington, Seattle, WA, USA Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA, USA Department of Chemistry, University of California, Berkeley, CA, USA During the Biosphere Effects on AeRosols and Photochemistry EXperiment 2007 (BEARPEX-2007), we observed eddy covariance (EC) fluxes of speciated acyl peroxy nitrates (APNs), including peroxyacetyl nitrate (PAN), peroxypropionyl nitrate (PPN) and peroxymethacryloyl nitrate (MPAN), above a Ponderosa pine forest in the western Sierra Nevada. All APN fluxes are net downward during the day, with a median midday PAN exchange velocity of −0.3 cm s^−1; nighttime storage-corrected APN EC fluxes are smaller than daytime fluxes but still downward. Analysis with a standard resistance model shows that loss of PAN to the canopy is not controlled by turbulent or molecular diffusion. Stomatal uptake can account for 25 to 50% of the observed downward PAN flux. Vertical gradients in the PAN thermal decomposition (TD) rate explain a similar fraction of the flux, suggesting that a significant portion of the PAN flux into the forest results from chemical processes in the canopy. The remaining "unidentified" portion of the net PAN flux (~15%) is ascribed to deposition or reactive uptake on non-stomatal surfaces (e.g. leaf cuticles or soil). Shifts in temperature, moisture and ecosystem activity during the summer – fall transition alter the relative contribution of stomatal uptake, non-stomatal uptake and thermochemical gradients to the net PAN flux. 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