Hourly Measurements of Fine Particulate Sulfate and Carbon Aerosols at the Harvard-U.S. Environmental Protection Agency Supersite in Boston

作者：Kang Choong Min; Koutrakis Petros; Suh Helen H^*

来源：Journal of the Air & Waste Management Association, 2010, 60(11): 1327-1334.

DOI：10.3155/1047-3289.60.11.1327

Hourly concentrations of ambient fine particle sulfate and carbonaceous aerosols (elemental carbon [EC], organic carbon [OC], and black carbon [BC]) were measured at the Harvard-U.S. Environmental Protection Agency Supersite in Boston, MA, between January 2007 and October 2008. These hourly concentrations were compared with those made using integrated filter-based measurements over 6-day or 24-hr periods. For sulfate, the two measurement methods showed good agreement. Semicontinuous measurements of EC and OC also agreed (but not as well as for sulfate) with those obtained using 24-hr integrated filterbased and optical BC reference methods. During the study period, 24-hr PM(2.5) (particulate matter [PM] <= 2.5 mu m in aerodynamic diameter) concentrations ranged from 1.4 to 37.6 mu s/m(3), with an average of 9.3 mu g/m(3). Sulfate as the equivalent of ammonium sulfate accounted for 39.1% of the PM(2.5) mass, whereas EC and OC accounted for 4.2 and 35.2%, respectively. Hourly sulfate concentrations showed no distinct diurnal pattern, whereas hourly EC and BC concentrations peaked during the morning rush hour between 7:00 and 9:00 a.m. OC concentrations also exhibited nonpronounced, small peaks during the day, most likely related to traffic, secondary organic aerosol, and local sources, respectively.

• 出版日期2010-11