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Impacts of 2018 California Wildfires on Organic Aerosol Composition and Air Quality under Low Smoke Conditions
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsearthspacechem.0c00202 Jonas J. Enders 1 , Tyrell W. Rhead 1 , Jerry A. Phan 1 , Matthew C. Zoerb 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsearthspacechem.0c00202 Jonas J. Enders 1 , Tyrell W. Rhead 1 , Jerry A. Phan 1 , Matthew C. Zoerb 1
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Wildfires make significant impacts on air quality due to large emissions of gas and particle phase species. Far from the source, smoke plumes are diluted and aging processes may transform much of the primary emissions, making it difficult to characterize the influence of biomass burning. This work utilizes size-resolved particle measurements under low smoke conditions to examine the influence of aged aerosol emissions on regional air quality through correlations with PM2.5 and ozone concentrations. Size-resolved aerosol samples were collected using a micro-orifice uniform deposit impactor (MOUDI), and their extracts were analyzed by electrospray ionization mass spectrometry (ESI-MS) and absorption spectroscopy. Particle size distributions and number concentrations were measured online during MOUDI sampling periods. Measured levoglucosan intensity, UV absorption, and particle number concentration were compared with local PM2.5 and ozone measurements available from the California Air Resources Board. Biomass burning organic aerosol was significantly correlated with PM2.5 and ozone concentrations, but the relationships were highly dependent on particle diameter. Even under low smoke conditions when air quality standards are met, wildfire emissions may make large contributions to the variability in air quality.
中文翻译：
低烟条件下2018年加州野火对有机气溶胶成分和空气质量的影响
由于大量气体和颗粒物的排放，野火对空气质量产生重大影响。烟羽远离源头，被稀释，老化过程可能会转化许多主要排放物，从而难以表征生物质燃烧的影响。这项工作利用低烟雾条件下的尺寸分辨颗粒测量结果，通过与PM 2.5的相关性研究了老化的气溶胶排放对区域空气质量的影响。和臭氧浓度。使用微孔均匀沉积撞击器（MOUDI）收集尺寸分辨的气溶胶样品，并通过电喷雾电离质谱（ESI-MS）和吸收光谱分析其提取物。在MOUDI采样期间在线测量了粒度分布和数量浓度。将测得的左旋葡聚糖强度，紫外线吸收率和颗粒数浓度与当地的PM 2.5和可从加利福尼亚空气资源委员会获得的臭氧测量值进行比较。生物质燃烧有机气溶胶与PM 2.5显着相关和臭氧浓度，但关系高度依赖于粒径。即使在满足空气质量标准的低烟条件下，野火排放也可能对空气质量的变化做出很大贡献。
更新日期：2021-02-18
中文翻译：
低烟条件下2018年加州野火对有机气溶胶成分和空气质量的影响
由于大量气体和颗粒物的排放，野火对空气质量产生重大影响。烟羽远离源头，被稀释，老化过程可能会转化许多主要排放物，从而难以表征生物质燃烧的影响。这项工作利用低烟雾条件下的尺寸分辨颗粒测量结果，通过与PM 2.5的相关性研究了老化的气溶胶排放对区域空气质量的影响。和臭氧浓度。使用微孔均匀沉积撞击器（MOUDI）收集尺寸分辨的气溶胶样品，并通过电喷雾电离质谱（ESI-MS）和吸收光谱分析其提取物。在MOUDI采样期间在线测量了粒度分布和数量浓度。将测得的左旋葡聚糖强度，紫外线吸收率和颗粒数浓度与当地的PM 2.5和可从加利福尼亚空气资源委员会获得的臭氧测量值进行比较。生物质燃烧有机气溶胶与PM 2.5显着相关和臭氧浓度，但关系高度依赖于粒径。即使在满足空气质量标准的低烟条件下，野火排放也可能对空气质量的变化做出很大贡献。
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