Observation on Great Dun Fell of the pathways by which oxides of nitrgoen are converted to nitrate.

Colville, R.N.; Choularton, T.W.; Gallacher, M.W.; Wicks, A.J.; Downer, R.M.; Tyler, B.J.; Hargreaves, K.J.; Storeton-West, R.L.; Fowler, D.; Cape, J.N.; Dollard, G.J.; Davies, T.J.; Jones, B.M.R.; Penkett, S. A.; Bandy, B. J.; Burgess, R .A.. 1994 Observation on Great Dun Fell of the pathways by which oxides of nitrgoen are converted to nitrate. Atmospheric Environment, 28 (3). 397-408.

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Two field experiments to investigate the formation of nitrate as an airstream passes through a hill cap cloud have been performed at the UMIST field station on Great Dun Fell. Techniques chosen for the measurement of various nitrogen species are described. The results of the second field experiment are discussed and compared with those of the first. Evidence is found in support of the hypothesis that under the range of conditions studied, the dominant pathway for nitrate production is the solution of N2O5 formed from the reaction of NOx with O3 upwind. The effectiveness of this pathway by night and by day is observed to be a function of the NOx mixing ratio. A surface reaction rate constant of around 300 cm3 cm−2 s−1 for the hydration of N2O5 is inferred from the observations. These results are shown to be consistent with recent laboratory measurements of the rates of reaction of nitrogen species. It is suggested that pathways other than via N2O5 may be significant sources of nitrate under certain conditions that merit further investigation.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
UKCEH and CEH Sections/Science Areas: Billett (to November 2013)
ISSN: 1352-2310
Additional Keywords: Air pollution, field study, atmospheric chemistry, troposphere, clouds, nitrogen compounds, NOx; N2O5, nitrate, HNO3
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 13 May 2009 12:11 +0 (UTC)

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