AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Long Term Profile of PM$_(2.5) at Egbert Ontario Monitored by the Canadian Air and Precipitation Monitoring Network (CAPMoN)
KULBIR BANWAIT, Nancy Lance, Environment and Climate Change Canada
Abstract Number: 670 Working Group: Remote and Regional Atmospheric Aerosols
Abstract Canadian Air and Precipitation Monitoring Network (CAPMoN) is a rural and remote air-quality monitoring network consisting of thirty-three sampling stations (one in U.S.) producing data in support of the Canada-U.S. Agreement on Air Quality and its December 2000 Ozone Annex, Canada-Wide Standards for Particulate Matter, Canada-Wide Acid Rain Strategy and Ground-level Ozone. Data from 2003 to 2013 was examined from one rural - Egbert - site located 60 km north of Toronto, Ontario for particulate matter with aerodynamic diameter of 2.5 micro-meter (PM$_(2.5)) dichotomous and speciation sampler gravimetric mass-concentration ([mass]) comparison, reconstructed chemical [mass] closure to the gravimetric [mass], and seasonal and annual trends in PM$_(2.5) chemical composition. Speciation sampler PM$_(2.5) gravimetric [mass] accounted for 92 percent of dichotomous sampler PM$_(2.5) gravimetric [mass] with 96 percent of the correlation variability explained. Ninety-five percent of the dichotomous sampler gravimetric [mass] was explained by the reconstructed chemical [mass] with 85 percent of the correlation variability explained. PM$_(2.5) gravimetric [mass] annual average loading was observed to be declining by 0.42 micro-gram/m$^3/yr for the reported period and averaged highest, at 11.10 micro-gram/m$^3 ,in 2005 and 5.76 micro-gram/m$^3 , in 2013. Inorganic species sulfate, nitrate and ammonium (48.3%), and organic matter (26.2%) made up major portion of the PM$_(2.5) [mass] and, both, contributed significantly to the stated decrease in annual [mass] loading. Particulate trace elements (9.0%), crustal matter (7.1%), unidentified matter (5.2%), elemental carbon (2.8%), trace inorganic ions (0.9%), and sodium chloride (0.5%) contributed to the rest of the total gravimetric PM$_(2.5) [mass] loading, and stayed relatively constant at Egbert throughout the reported period.