부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.atmosenv.2005.12.027 Byline: Kurt Anlauf, Shao-Meng Li, Richard Leaitch, Jeff Brook, Katherine Hayden, Desiree Toom-Sauntry, Alan Wiebe Keywords: Ambient aerosols; Nitrate; Sulphate; Size distributions Abstract: The size distribution of aerosol chemical compositions was studied over a 2-week period in August 2001 at three locations (one urban and two semi-rural) in the Lower Fraser Valley (LFV) of British Columbia, Canada. The size distributions varied diurnally and were bimodal with a pronounced peak at about 0.3-0.55[mu]m (accumulation mode) and 2-7[mu]m (coarse mode). Generally, on an equivalent basis, the aerosol was dominated by SO.sub.4.sup.2- (balanced by NH.sub.4.sup.+) in the accumulation mode range; SO.sub.4.sup.2- often exhibited a diurnal variation that was primarily the result of fog deposition overnight and photochemical formation during the day. SO.sub.4.sup.2- in the 3.1-6.2[mu]m particles was mostly of marine origin. Most of the smaller particle SO.sub.4.sup.2- was from anthropogenic sources and it is estimated that about 75% of the SO.sub.4.sup.2- in the smaller particles were due to secondary processes. Oxalate, C.sub.2O.sub.4.sup.2-, although at low concentrations (generally Author Affiliation: Environment Canada, Meteorological Service of Canada.sup.1 , 4905 Dufferin St., Toronto, Ontario, Canada M3H 5T4 Article History: Received 30 April 2005; Revised 14 December 2005; Accepted 15 December 2005