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

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dc.contributor.authorTokarek, T. W.
dc.contributor.authorBrownsey, D. K.
dc.contributor.authorJordan, N.
dc.contributor.authorGarner, N. M.
dc.contributor.authorYe, C. Z.
dc.contributor.authorAssad, F. V.
dc.contributor.authorPeace, A.
dc.contributor.authorSchiller, C. L.
dc.contributor.authorMason, R. H.
dc.contributor.authorVingarzan, R.
dc.contributor.authorOsthoff, H. D.
dc.date.accessioned2017-05-31T16:53:54Z
dc.date.available2017-05-31T16:53:54Z
dc.date.issued2017-04-11
dc.description.abstractRoutine 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 nights and were characterized by a simultaneous increase of CO2 and BVOC abundances, in particular of limonene, a terpene 2.5 more reactive with respect to oxidation of O3 than other monoterpenes. Back trajectory calculations showed that ODEs occurred mainly in air masses that originated from the WNW where the air would have travelled parallel to the coastline and above kelp forests. Head space analyses of sea weed samples showed that bull kelp is a source of gas-phase limonene, consistent with its high relative abundance in air masses from the WNW sector. However, the enhanced terpene and CO2 content showed that the air likely also came in contact with terrestrial vegetation via mesoscale transport phenomena (such as slope flows and land-sea breeze circulations) that were generally poorly captured by the back trajectories. This absence of aerosol growth during ODEs indicates that dry deposition is likely the primary O3 loss mechanism.en_US
dc.description.grantingagencyNSERC - Tri-Agency Open Access Policyen_US
dc.description.refereedYesen_US
dc.description.sponsorshipThis work was made possible with support from the Natural Sciences and Engineering Research Council of Canada (NSERC),the Fraser Basin Council’sBC Clean Air Research (CLEAR)Fund,and a Grant and Contribution agreement from Environment and Climate Change Canada [G&C #1034584].en_US
dc.identifier.citationTokarek, T. W., et al. (2017), Biogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Island, Atmosphere-Ocean, 55(2), 121-132, doi:10.1080/07055900.2017.1306687.en_US
dc.identifier.doi10.1080/07055900.2017.1306687
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/35404
dc.identifier.grantnumberRGPIN-2016-03849en_US
dc.identifier.urihttp://hdl.handle.net/1880/51993
dc.language.isoenen_US
dc.publisherTaylor & Francisen_US
dc.publisher.corporateUniversity of Calgary
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.urlhttp://tandfonline.com/doi/full/10.1080/07055900.2017.1306687en_US
dc.subjectmarine boundary layeren_US
dc.subjectOzone depletionen_US
dc.subjectcoastal zoneen_US
dc.subjectmonoterpene emissionsen_US
dc.subjectkelpen_US
dc.subjectlimoneneen_US
dc.titleBiogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Islanden_US
dc.typejournal article
thesis.degree.disciplineAnalytical
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