Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1030
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Dec 2016
Review status
A revision of this discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Diurnal fluxes of HONO above a crop rotation
Sebastian Laufs1, Mathieu Cazaunau2,3, Patrick Stella4,5, Ralf Kurtenbach1, Pierre Cellier4, Abdelwahid Mellouki2, Benjamin Loubet4, and Jörg Kleffmann1 1Physikalische und Theoretische Chemie, Fakultät 4, Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
2ICARE-CNRS, 1 C Av. de la Recherche Scientifique, 45071 Orléans cedex 2, France
3LISA, UMR 7583, CNRS, Université s Paris Est Créteil et Paris Di derot, 94010 Créteil, France
4UMR ECOSYS, INRA, AgroParisTech, Université Pa ris-Saclay, 78850, Thiv erval-Grignon, France
5UMR SADAPT, AgroParisTech, IN RA, Université Paris-Saclay, 75005, Paris, France
Abstract. Nitrous acid (HONO) fluxes were measured above an agricultural field site near Paris during different seasons, above bare soil and different crops using the aerodynamic gradient (AG) method. Two LOPAPs (LOng Path Absorption Photometer) were used to determine the HONO gradients between two heights. During daytime mainly positive HONO fluxes were observed which showed strong correlation with the product of the NO2 concentration and the long wavelength UV light intensity, expressed by the photolysis frequency J(NO2). These results indicate HONO formation by photosensitized heterogeneous conversion of NO2 on soil surfaces as observed in recent laboratory studies. An additional influence of the soil temperature on the HONO flux can be explained by the temperature dependent HONO adsorption on the soil surface. A parameterization of the HONO flux at this location with NO2 concentration, J(NO2), soil temperature and humidity fits reasonably well all flux observations at this location.

Citation: Laufs, S., Cazaunau, M., Stella, P., Kurtenbach, R., Cellier, P., Mellouki, A., Loubet, B., and Kleffmann, J.: Diurnal fluxes of HONO above a crop rotation, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1030, in review, 2016.
Sebastian Laufs et al.
Sebastian Laufs et al.
Sebastian Laufs et al.

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Short summary
Sources of nitrous acid (HONO), a major precursor of the OH radical, are still under controversial discussion. Since mainly ground surface sources have been proposed, HONO fluxes were measured above an agricultural field. Positive daytime fluxes were observed which showed strong correlation with the product of the NO2 concentration and J(NO2). These results indicate HONO formation by photosensitized heterogeneous conversion of NO2 on soil surfaces as observed in recent laboratory studies.
Sources of nitrous acid (HONO), a major precursor of the OH radical, are still under...
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