Quantitative determination of the biomass-burning contribution to atmospheric carbonaceous aerosols in Daejeon, Korea, during the rice-harvest period

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• 作者：Jinsang Jung^a ; ^{jsjung@kriss.re.kr" class="auth_mail} ; ^{buddych@gmail.com" class="auth_mail} ; Sangil Lee^a ; Hyosun Kim^a ; ^b ; Doyeon Kim^a ; ^c ; Hyoeun Lee^a ; ^c ; Sanghyup Oh^a
• 关键词：Biomass burning ; Levoglucosan ; Mannosan ; Galactosan ; Potassium ; Organic carbon ; Elemental carbon
• 刊名：Atmospheric Environment
• 出版年：June, 2014
• 年：2014
• 卷：89
• 期：Complete
• 页码：642-650
• 全文大小：1618 K

文摘

To investigate the impact of biomass-burning emissions on atmospheric carbonaceous aerosols, the biomass burning tracers; levoglucosan, mannonsan, galactosan, and K⁺ were measured at a suburban site in Daejeon, Korea, during the rice-harvest period, during the fall, 2012. The emissions of K⁺ from biomass burning (K⁺_{_BB}) were estimated by subtracting sea-salt K⁺ and soil K⁺ concentrations from measured K⁺ concentrations. Regression analysis of levoglucosan and K⁺_{_BB} reveals that K⁺_{_BB} alone is not suitable as a biomass-burning tracer in the Daejeon atmosphere, especially when the biomass-burning contribution is low. Levoglucosan to K⁺_{_BB} ratios during the study period ranged from 0.40 to 1.39, with an average of 0.89聽卤聽0.30, whereas levoglucosan to mannosan ratios ranged from 4.61 to 15.45, with an average of 6.70聽卤聽2.69. The ratios of levoglucosan to mannosan, K⁺, organic carbon (OC), and elemental carbon (EC) show that biomass-burning aerosols in the Daejeon atmosphere during the rice-harvest period are emitted mainly from crop residue, grass, and leaf burnings. The contributions of biomass-burning emissions to OC and EC concentrations were 45%聽卤聽12% and 12%聽卤聽7.3%, respectively, indicating that a large fraction of OC was emitted from biomass burning.