title: Use of a dense monitoring network of low-cost instruments to observe local changes in the diurnal ozone cycles as marine air passes over a geographically isolated urban centre.
abstract: Ozone (O3) concentrations in urban areas are spatially and temporally variable, influenced by chemical production, depletion through deposition and chemical titration processes and dispersion. To date, analysis of intra-urban variability of O3concentrations, and the influence of local controls on production and depletion rates, has been limited due to the low spatial and/or temporal resolution of measurements. We demonstrate that measurements made using a carefully managed multi-sensor network of low-cost gas-sensitive semiconductor instruments are sufficiently precise to resolve subtle but significant variations in ozone concentration across a region. Ozone was measured at 12 sites in the isolated subtropical city of Auckland, New Zealand. Overall O3concentrations in the Auckland region were low (annual mean: 19ppb) across all seasons, with a minimum in summer. Higher O3concentrations (max. 57ppb) were observed when wind speeds were >5ms-1and from the W/SW, and were associated with maritime air masses. Ozone formation in the Auckland region is low, which is attributed to a combination of the low O3background concentrations, the negligible contribution of long-range transport and the effect of NOx titration. Intra-urban variability showed that the lowest O3concentrations were measured at the residential sites, particularly at night and during rush hours. Ozone depletion from reaction with traffic-generated NO explains the rush-hour minima but did not fully account for the low night-time values. The results suggest that night-time depletion may result from other processes such as the reaction of ozone with nitrite on surfaces such as concrete, pointing towards the need for further studies concerning the rate and mechanism of dry deposition at night in urban areas.
authors.affiliation: School of Chemical Sciences, Faculty of Science, University of Auckland, New Zealand. Electronic address: lwei999@aucklanduni.ac.nz.
authors.forename: L F
authors.initials: LF
authors.lastname: Weissert
authors.affiliation: School of Environment, Faculty of Science, University of Auckland, Auckland, New Zealand.
authors.forename: J A
authors.initials: JA
authors.lastname: Salmond
authors.affiliation: School of Chemical Sciences, Faculty of Science, University of Auckland, New Zealand.
authors.forename: G
authors.initials: G
authors.lastname: Miskell
authors.affiliation: School of Chemical Sciences, Faculty of Science, University of Auckland, New Zealand.
authors.forename: M
authors.initials: M
authors.lastname: Alavi-Shoshtari
authors.affiliation: School of Chemical Sciences, Faculty of Science, University of Auckland, New Zealand.
authors.forename: S K
authors.initials: SK
authors.lastname: Grange
authors.affiliation: Aeroqual Ltd., 109 Valley Rd, Mt Eden, Auckland, New Zealand.
authors.forename: G S
authors.initials: GS
authors.lastname: Henshaw
authors.affiliation: School of Chemical Sciences, Faculty of Science, University of Auckland, New Zealand.
authors.forename: D E
authors.initials: DE
authors.lastname: Williams
keywords: Air quality; Low-cost sensors; NOx titration; New Zealand; O(3); Southern Hemisphere