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Organic tracers of fine aerosol particles in central Alaska: summertime composition and sources

机译：精细气溶胶颗粒有机示踪剂在阿拉斯加中部：夏季组成和来源

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PM2.5 aerosols were collected at Fairbanks (64.51 degrees N and 147.51 degrees W) in central Alaska during the summer of 2009 and analyzed for organic tracer compounds using a gas chromatograph-mass spectrometer. The organic compounds were grouped into 14 classes based on their functional groups and sources. Concentrations of the total organics measured ranged from 113 to 1664 ng m(-3) (avg 535 ng m(-3)). Anhydrosugars (avg 186 ng m(-3)) and nalkanoic acids (avg 185 ng m(-3)) were 2 major classes among the 14 compound classes. The similar temporal trends and strong positive correlations among anhydrosugars and n-alkanoic acids demonstrated that biomass burning (BB) is the major source of organic aerosols (OAs) in central Alaska. The dominance of higher molecular weight n-alkanoic acids over lower molecular weight homologs and their carbon preference index (5.6-9.8) confirmed that they were mostly emitted from plant waxes during BB in central Alaska. The mass concentration ratios of levoglucosan to mannosan denoted that softwood is the main biomass burned. The rainfall event distinctly enhanced the levels of mannitol and arabitol due to the growth of fungi and active discharge of fungal spores in the subarctic region. Molecular compositions of biogenic secondary organic aerosol (BSOA) tracers inferred that isoprene is a crucial precursor of BSOA over central Alaska. Our results suggest forest fires and plant emissions to be the crucial factors controlling the levels and molecular composition of OAs in central Alaska. We propose that PM2.5 laden with OAs derived in central Alaska may significantly impact the air quality and climate in the Arctic via long-range atmospheric transport.
机译：在2009年夏天，在阿拉斯加市中心（64.51摄氏度N和147.51摄氏度）收集PM2.5气溶胶，并使用气相色谱仪质谱仪分析用于有机示踪化合物。基于其官能团和来源将有机化合物分成14级。测量的总机的浓度范围为113至1664ng m（-3）（AVG 535ng m（-3））。 Anhydrougars（AVG 186 ng m（-3））和苯甲酸（AVG 185ng m（-3））是14种复合类别中的2个主要类。 Anhydrosugars和N-链烷酸之间的类似时间趋势和强阳性相关性证明了生物量燃烧（BB）是阿拉斯加中部有机气溶胶（OAS）的主要来源。在较低分子量同源物和它们的碳偏好指数上（5.6-9.8）的高分子量N-链烷酸的优势证实，它们在阿拉斯加中部的BB期间主要从植物蜡发射。 Levoglucosan至Mannosan的质量浓度比表示，软木是燃烧的主要生物质。由于真菌的生长和亚曲线区域真菌孢子的生长，降雨事件明显增强了甘露醇和阿拉伯醇的水平。生物学二次有机气溶胶（BSOA）示踪剂的分子组合物推断，异戊二烯是阿拉斯加中部BsoA的关键前体。我们的结果表明森林火灾和植物排放是控制阿拉斯加中部oas水平和分子组成的关键因素。我们建议PM2.5载有阿拉斯加中部的OAS的载客可能会通过远程大气运输来显着影响北极的空气质量和气候。

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