Diurnal fluxes of HONO above a crop rotation. Laufs, S., Cazaunau, M., Stella, P., Kurtenbach, R., Cellier, P., Mellouki, A., Loubet, B., & Kleffmann, J. Atmospheric Chemistry and Physics, 17(11):6907-6923, 2017. doi abstract bibtex 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.
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title = {Diurnal fluxes of HONO above a crop rotation},
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year = {2017},
pages = {6907-6923},
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abstract = {<p>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 NO<sub>2</sub> concentration and the long wavelength UV light intensity, expressed by the photolysis frequency <i>J(NO</i><sub>2</sub>). These results indicate HONO formation by photosensitized heterogeneous conversion of NO<sub>2</sub> 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 NO<sub>2</sub> concentration, <i>J(NO</i><sub>2</sub>), soil temperature and humidity fits reasonably well all flux observations at this location.</p>},
bibtype = {article},
author = {Laufs, Sebastian and Cazaunau, Mathieu and Stella, Patrick and Kurtenbach, Ralf and Cellier, Pierre and Mellouki, Abdelwahid and Loubet, Benjamin and Kleffmann, Jörg},
doi = {10.5194/acp-17-6907-2017},
journal = {Atmospheric Chemistry and Physics},
number = {11}
}
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