Aerosol Size Distributions in Auckland
Coulson, G., Olivares, G. and Talbot, N.
Urban aerosol measurements in New Zealand have largely been conducted for regulatory purposes and therefore based on PMx metrics while other particle metrics such as size distributions, number concentration, surface area, scatter, etc. have received very little attention. Particle size distributions and particle number concentrations have been measured at various locations around Auckland for the first time during the past three to four years and have been brought together here to give a snapshot of Auckland’s characteristic aerosol. Results show an aerosol typical of traffic dominated locations with an Aitken mode at most locations likely due to freshly emitted traffic exhaust. A large night-time accumulation mode is also evident in urban influenced air related to burning of wood for domestic heating. Particle formation events were observed in central Auckland under conditions that suggest regional formation but which cannot be confirmed in the absence of supporting data and which requires further investigation to test this hypothesis. These results are consistent with others from cities around the World except for the particle formation events.
Getting the Most out of WRF
The Weather Research and Forecasting Model is increasingly being used by Australian air quality professionals to generate meteorological data for input to dispersion models. The author’s own experience indicates the trend is to be encouraged, because of its flexibility, accuracy and ready accessibility. As with all models, however, there are many issues that can be addressed to improve the quality of its estimates, and the ease with which it can be applied in air quality modelling. This article aims to help those who are considering or commencing its use.
- The First International Biomass Emissions Conference – Coulson, G.
Meeting Report: National Air Quality and Health – Lungs and Air – Allan, H., Walter, C., Fisher, G.