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Lin, YC; Lin, CY; Lin, PH; Engling, G; Lin, YC; Lan, YY; Chang, CWJ; Kuo, TH; Hsu, WT; Ting, CC (2013). Influence of Southeast Asian biomass burning on ozone and carbon monoxide over subtropical Taiwan. ATMOSPHERIC ENVIRONMENT, 64, 358-365.

Surface ozone (O-3) and carbon monoxide (CO) mixing ratios were measured at Mei-Feng (24.05 degrees N, 120.10 degrees E, 2269 m above sea level) remote mountain site between March 2009 and September 2010 to investigate the impact of regional pollution on O-3 and CO. The results showed that the maximum values of both O-3 and CO were found in the springtime. Backward trajectory analysis, combined with MODIS fire spots suggested that the enhanced O-3 and CO in springtime could be attributed to biomass burning (BB) activities over Southeast (SE) Asia. Thirteen BB events were identified by backward trajectory analysis, MODIS fires, NCEP weather data sets and CO concentrations. Good correlation between O-3 and CO was found during the BB plumes. Using the linear regression, the slope (Delta O-3/Delta CO) was calculated to be 0.18 +/- 0.08 (mean +/- 1 sigma). This value was in agreement with that of 0.2 observed over the west Pacific region during the TRACE-P campaign, but was higher than those (0.11-0.14) of Canadian and Siberian fires. Moreover, significant enhanced O-3 productivity was also found in aged BB plumes and that mixed with urban emissions from SE coastal China. To assess the net influence of SE Asian BB, the air masses from SE Asia and SE China were divided in two groups: those that passed over the fire regions (PF) and those that did not (NP). The result showed that the maximum differences between PF and NP were estimated in March with 8 ppb for O-3 and 45 ppb for CO, respectively, accounting for 23% of both CO and O-3 levels at Mei-Feng. Although uncertainties existed in the estimations, the significant discrepancies of O-3 and CO in the two air groups suggested the air pollutants emitted by SE Asian BB could be transported and influence the air quality over subtropical Taiwan in springtime. (C) 2012 Elsevier Ltd. All rights reserved.



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