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Contribution of Kansas pasture burning to ambient ozone: a combination of receptor modeling, time series and regression analysis

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2016 ASABE Annual International Meeting  162460949.(doi:10.13031/aim.20162460949)
Authors:   Zifei Liu, Yang Liu
Keywords:   Source apportionment, rangeland burning, IMPROVE, CASNET, Secondary organic aerosols, Smoke.

Abstract. Prescribed pasture burning is a long-standing practice in the Flint Hills region of eastern Kansas used to maintain the tallgrass prairie ecosystem, and most burning occur in April. The smoke plumes originating from these fires increases ambient PM2.5 concentrations and potentially contributed to ozone (O3) exceedances in downwind communities. Our source apportionment research using Unmix modeling has successfully unraveled the source profiles of Kansas pasture burning and demonstrated that burning activities contributed 39% of the average PM2.5 concentration in April. The objective of this work is to investigate the potential correlations between O3 and various sources of PM2.5 that are derived from the Unmix modeling, and to specifically estimate contributions of Kansas pasture burning to ambient O3 concentrations. The study utilized data from routine monitoring networks that provide long-term observations (2002-2014) of ambient concentrations of PM2.5 (including chemical speciation) and O3. 8-h daily maximum O3 concentration data was . Multiple linear regression models were then be used to correlate the deseasonalized O3 concentrations to the daily source contributions of PM2.5 as well as weather conditions. The final O3 regression model had an r2 of 0.75 between measured and modeled O3 concentrations. The O3 concentrations were significantly affected by total solar radiation, precipitation, and air temperature. And they were partially correlated with the S3-secondary organic aerosol and S4-sulfate/industrial of the PM2.5 sources. It can be estimated that prescribed rangeland burning contributed about 2.3 ppb or 4.5% of the average 8-h daily maximum O3 concentration in April (51.3ppb).

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