Biogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Island ...

• Main Authors: Tokarek, T. W., Brownsey, D. K., Jordan, N., Garner, N. M., Ye, C. Z., Assad, F. V., Peace, A., Schiller, C. L., Mason, R. H., Vingarzan, R., Osthoff, H. D.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Taylor & Francis 2017
• Subjects: marine boundary layer; Ozone depletion; coastal zone; monoterpene emissions; kelp; limonene; Canada; Pacific; Orca
• Online Access: https://dx.doi.org/10.11575/prism/35404; https://prism.ucalgary.ca/handle/1880/51993

Routine monitoring stations on the west coast of North America serve to monitor baseline levels of criteria pollutants such as ozone (O3) arriving from the Pacific Ocean. In Canada, the Amphitrite Point Observatory (APO) on Vancouver Island has been added to this network to provide regional baseline measurements. In 2014, McKendry and co-workers reported frequent nocturnal O3 depletion events (ODEs) at APO that generally correlated with alongshore winds, elevated concentrations of carbon dioxide (CO2) and stable boundary layer conditions, but whose cause (or causes) has (have) remained unclear. This manuscript presents results from the Ozone-depleting Reactions in a Coastal Atmosphere (ORCA) campaign, which took place in July, 2015 to further investigate ODEs at APO. In addition to the long-term measurements at the site (e.g., of CO2 and O3 mixing ratios), abundances of biogenic volatile organic compounds (BVOC) and aerosol size distributions were quantified. ODEs were observed on the majority of measurement ...