<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Lee, Alex K. Y.</style></author><author><style face="normal" font="default" size="100%">Abbatt, Jonathan P. D.</style></author><author><style face="normal" font="default" size="100%">Leaitch, W. Richard</style></author><author><style face="normal" font="default" size="100%">Li, Shao-Meng</style></author><author><style face="normal" font="default" size="100%">Sjostedt, Steve J.</style></author><author><style face="normal" font="default" size="100%">Wentzell, Jeremy J. B.</style></author><author><style face="normal" font="default" size="100%">Liggio, John</style></author><author><style face="normal" font="default" size="100%">Macdonald, Anne Marie</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Substantial secondary organic aerosol formation in a coniferous forest: observations of both day- and nighttime chemistry</style></title><secondary-title><style face="normal" font="default" size="100%">ATMOSPHERIC CHEMISTRY AND PHYSICS</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2016</style></year></dates><number><style face="normal" font="default" size="100%">11</style></number><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">6721-6733</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region in Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of aerosol mass spectrometry (AMS) measurement identified two types of BSOA (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation of monoterpenes and perhaps sesquiterpenes. The temporal variations of BSOA-1 and BSOA-2 can be explained by gas-particle partitioning in response to ambient temperature and the relative importance of different oxidation mechanisms between day and night. While BSOA-1 arises from gas-phase ozonolysis and nitrate radical chemistry at night, BSOA-2 is likely less volatile than BSOA-1 and consists of products formed via gas-phase oxidation by OH radical and ozone during the day. Organic nitrates produced through nitrate radical chemistry can account for 22-33aEuro-% of BSOA-1 mass at night. The mass spectra of BSOA-1 and BSOA-2 have higher values of the mass fraction of m/zaEuro-91 (f(91)) compared to the background organic aerosol. Using f(91) to evaluate BSOA formation pathways in this unpolluted, forested region, heterogeneous oxidation of BSOA-1 is a minor production pathway of BSOA-2.</style></abstract></record></records></xml>