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首页> 外文期刊>Atmospheric chemistry and physics >Chemical characterisation of atmospheric aerosols during a 2007 summer field campaign at Brasschaat, Belgium: sources and source processes of biogenic secondary organic aerosol
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Chemical characterisation of atmospheric aerosols during a 2007 summer field campaign at Brasschaat, Belgium: sources and source processes of biogenic secondary organic aerosol

机译：比利时Brasschaat 2007年夏季野外运动期间大气气溶胶的化学特征：生物成因有机有机气溶胶的来源和来源过程

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Measurements of organic marker compounds and inorganic species wereperformed on PM2.5 aerosols from a Belgian forest site that is severelyimpacted by urban pollution ("De Inslag", Brasschaat, Belgium) during a2007 summer period within the framework of the "Formation mechanisms,marker compounds, and source apportionment for biogenic atmospheric aerosols(BIOSOL)" project. The measured organic species included (i) low-molecularweight (MW) dicarboxylic acids (LMW DCAs), (ii) methanesulfonate (MSA),(iii) terpenoic acids originating from the oxidation of α-pinene,β-pinene, d-limonene and Δ3-carene, and (iv)organosulfates related to secondary organic aerosol from the oxidation ofisoprene and α-pinene. The organic tracers explained, on average,5.3 % of the organic carbon (OC), of which 0.7 % was due to MSA, 3.4 %to LMW DCAs, 0.6 % to organosulfates, and 0.6 % to terpenoic acids. Thehighest atmospheric concentrations of most species were observed during thefirst five days of the campaign, which were characterised by maximumday-time temperatures >22 °C. Most of the terpenoic acids and theorganosulfates peaked during day-time, consistent with their localphotochemical origin. High concentrations of3-methyl-1,2,3-butanetricarboxylic acid (MBTCA) and low concentrations ofcis-pinonic acid were noted during the first five days of the campaign,indicative of an aged biogenic aerosol. Several correlations between organicspecies were very high (rr<0.85), or substantial(0.5i>r<0.7), suggesting that they are generated through similarformation pathways. Substantial correlations with temperature were found forOC, water-soluble OC, MBTCA, and several other organic species. MBTCA andterebic acid were highly correlated with the temperature (r
机译：在2007年夏季期间，在来自比利时森林站点的PM 2.5 气溶胶上对有机标志物和无机物进行了测量，该气溶胶受到城市污染的严重影响（“ De Inslag”，比利时Brasschaat，比利时）。 “生物成因大气气溶胶（BIOSOL）的形成机理，标记化合物和源分配”项目。测得的有机物包括（i）低分子量（MW）二元羧酸（LMW DCAs），（ii）甲磺酸盐（MSA），（iii）源自α-pine烯，β-，烯氧化的对苯二甲酸d-柠檬烯和Δ 3 -胡萝卜素，以及（iv）与异戊二烯和α-pine烯氧化产生的二次有机气溶胶有关的有机硫酸盐。有机示踪剂平均解释了有机碳（OC）的5.3％，其中0.7％是MSA，3.4％是LMW DCA，0.6％是有机硫酸盐，0.6％是萜烯酸。在战役开始的前五天，观察到大多数物种的最高大气浓度，其最大白天温度大于22°C。大多数萜烯酸和有机硫酸盐在白天达到峰值，这与它们的局部光化学来源一致。在运动的前五天，观察到高浓度的3-甲基-1,2,3-丁烷三羧酸（MBTCA）和低浓度的顺式-品酸，表明生物气溶胶已经老化。有机物种之间的几个相关性非常高（ r r <0.85）或显着（0.5 i> r < 0.7），表明它们是通过相似的形成途径生成的。发现OC，水溶性OC，MBTCA和其他几种有机物与温度的相关性很大。 MBTCA和对苯二甲酸与温度（ r

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