title: A field study of the generation of nitrate in a hill cap cloud.
abstract: A field experiment to investigate the formation of nitrate as an airstream passes through a hill cap cloud has been performed at the UMIST field station on Great Dun Fell. It has been shown that the aerosol nitrate concentration increased by about 0.5 microg m(-3) as the airstream passed through the cloud during the night. At sunrise the nitrate production disappeared. It is suggested that the most likely mechanism for this nitrate production was due to the solution of N2O5 and NO3 formed from the reaction of NO2 with O3. These higher oxides build up overnight in the absence of short wave radiation to photolyse them. Other possible mechanisms of nitrate production are also discussed.
authors.affiliation: Department of Pure and Applied Physics, UMIST, Manchester, UK.
authors.forename: T W
authors.initials: TW
authors.lastname: Choularton
authors.forename: A J
authors.initials: AJ
authors.lastname: Wicks
authors.forename: R M
authors.initials: RM
authors.lastname: Downer
authors.forename: M W
authors.initials: MW
authors.lastname: Gallagher
authors.forename: S A
authors.initials: SA
authors.lastname: Penkett
authors.forename: B J
authors.initials: BJ
authors.lastname: Bandy
authors.forename: G J
authors.initials: GJ
authors.lastname: Dollard
authors.forename: B M
authors.initials: BM
authors.lastname: Jones
authors.forename: T D
authors.initials: TD
authors.lastname: Davies
authors.forename: M J
authors.initials: MJ
authors.lastname: Gay
authors.forename: B J
authors.initials: BJ
authors.lastname: Tyler
authors.forename: D
authors.initials: D
authors.lastname: Fowler
authors.forename: J N
authors.initials: JN
authors.lastname: Cape
authors.forename: K J
authors.initials: KJ
authors.lastname: Hargreaves