Atmos. Chem. Phys. Discuss., 8, 3497-3523, 2008
www.atmos-chem-phys-discuss.net/8/3497/2008/
doi:10.5194/acpd-8-3497-2008
© Author(s) 2008. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Technical Note: Quantification of interferences of wet chemical HONO measurements under simulated polar conditions
J. Kleffmann and P. Wiesen
Physikalische Chemie – Fachbereich C, Bergische Universität Wuppertal, 42097 Wuppertal, Germany

Abstract. In the present pilot study, an optimized LOPAP instrument for the detection of nitrous acid (HONO) in the atmosphere (DL 0.2 pptV) was tested at the high alpine research station "Jungfraujoch" at 3580 m altitude in the Swiss Alps under conditions comparable to polar regions. HONO concentrations in the range <0.5–50 pptV with an average of 7.5 pptV were observed at the "Jungfraujoch". The diurnal profiles obtained exhibited clear maxima at noon and minima with very low concentration during the night supporting the proposed photochemical production of HONO. In good agreement with recent measurements at the South Pole, it was demonstrated, that interferences of chemical HONO instruments can significantly influence the measurements and lead to considerable overestimations, especially for low pollution level. Accordingly, the correction of interferences is of paramount importance for those instruments, which sample HONO on aqueous or humid surfaces.

Citation: Kleffmann, J. and Wiesen, P.: Technical Note: Quantification of interferences of wet chemical HONO measurements under simulated polar conditions, Atmos. Chem. Phys. Discuss., 8, 3497-3523, doi:10.5194/acpd-8-3497-2008, 2008.
 
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