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.accessioned2021-06-25T21:31:27Z
dc.date.available2021-06-25T21:31:27Z
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, I. G., Christensen, E., Schiller, C., Vingarzan, R., Macdonald, A. M., & Li, Y. (2014) 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 the cause (causes) for this remains (remain) 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., CO2 and O3 mixing ratios), abundances of biogenic volatile organic compounds (BVOC) and aerosol size distributions were quantified. On the majority of measurement nights, ODEs were observed and characterized by a simultaneous increase in CO2 and BVOC abundances, in particular of limonene, a terpene 2.5 times more reactive with respect to oxidation by O3 than other monoterpenes. Back trajectory calculations showed that ODEs occurred mainly in air masses originating from the west-northwest where the air would have travelled parallel to the coastline and above kelp forests. Head-space analyses of seaweed samples showed that bull kelp is a source of gas-phase limonene, consistent with its high relative abundance in air masses from the west-northwest 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. The absence of aerosol growth during ODEs indicates that dry deposition is likely the primary O3 loss mechanism.en_US
dc.identifier.citationTokarek, 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. (2017). Biogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Island. Atmosphere-Ocean, 55(2), 121-132. http://dx.doi.org/10.1080/07055900.2017.1306687en_US
dc.identifier.doihttp://dx.doi.org/10.1080/07055900.2017.1306687en_US
dc.identifier.issn0705-5900
dc.identifier.issn1480-9214
dc.identifier.urihttp://hdl.handle.net/1880/113538
dc.language.isoengen_US
dc.publisherTaylor and Francisen_US
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionacceptedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rightsThis is an Accepted Manuscript version of the following article, accepted for publication in Atmosphere-Ocean. 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. (2017). Biogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Island. Atmosphere-Ocean, 55(2), 121-132. http://dx.doi.org/10.1080/07055900.2017.1306687. It is deposited under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0en_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 articleen_US
ucalgary.item.requestcopytrueen_US
ucalgary.scholar.levelFacultyen_US
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