This 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.