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Nitrous acid (HONO) plays a crucial role in the self-cleansing capacity of the atmosphere but its formation mechanisms and spatial distributions are not well understood. This paper presents spectroscopic measurements of HONO, NO2 and aerosol measurements from Melbourne, Australia. HONO levels are at a maximum in the middle of the day, which is unprecedented for an urban area, and these measurements provide evidence for the existence of a strong ground-based, daytime nitrogen oxide source.
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Articles | Volume 18, issue 19
Atmos. Chem. Phys., 18, 13969–13985, 2018
https://doi.org/10.5194/acp-18-13969-2018
Atmos. Chem. Phys., 18, 13969–13985, 2018
https://doi.org/10.5194/acp-18-13969-2018

Research article 02 Oct 2018

Research article | 02 Oct 2018

Daytime HONO, NO2 and aerosol distributions from MAX-DOAS observations in Melbourne

Robert G. Ryan et al.

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Cited articles

AccessEconomics: The health of nations: the value of a statistical life, Tech. rep., Office of the Australian Safety and Compensation Council, 2008.
Acker, K. and Möller, D.: Atmospheric variation of nitrous acid at different sites in Europe, Environ. Chem., 4, 242–255, 1449–8979, 2007.
Acker, K., Moller, D., Wieprecht, W., Meixner, F. X., Bohn, B., Gilge, S., Plass-Dülmer C., and Berresheim, H.: Strong daytime production of OH from HNO2 at a rural mountain site, Geophys. Res. Lett., 33, L02809, https://doi.org/10.1029/2005GL024643, 2006.
Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F., Hynes, R. G., Jenkin, M. E., Rossi, M. J., and Troe, J.: Evaluated kinetic and photochemical data for atmospheric chemistry: Volume I – gas phase reactions of Ox, HOx, NOx and SOx species, Atmos. Chem. Phys., 4, 1461–1738, https://doi.org/10.5194/acp-4-1461-2004, 2004.
Australian Bureau of Meteorology: Climate data online, http://www.bom.gov.au/climate/data, last access: 1 April 2018.
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Short summary
Nitrous acid (HONO) plays a crucial role in the self-cleansing capacity of the atmosphere but its formation mechanisms and spatial distributions are not well understood. This paper presents spectroscopic measurements of HONO, NO2 and aerosol measurements from Melbourne, Australia. HONO levels are at a maximum in the middle of the day, which is unprecedented for an urban area, and these measurements provide evidence for the existence of a strong ground-based, daytime nitrogen oxide source.
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Final-revised paper
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