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首页> 外文期刊>Atmospheric chemistry and physics >Seasonal variation of PMsub10/sub main constituents in two valleys of the French Alps. I: EC/OC fractions
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Seasonal variation of PMsub10/sub main constituents in two valleys of the French Alps. I: EC/OC fractions

机译：法国阿尔卑斯山两个山谷中PM 10 主要成分的季节性变化。 I：EC / OC分数

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Daily PM10 samples were collected at two urban sites within two valleysin the French Alps (Chamonix and St Jean de Maurienne) during a period oftwo and a half years. The carbonaceous species EC (elemental carbon) and OC(organic carbon) were analysed to investigate the possible sources of EC andOC, and their seasonal variations. Mean OC concentrations are in the veryhigh range of concentrations measured for other European sites, andrepresent at least one third of the PM10 mass on each site. On thebasis of the comparison between EC and OC concentrations with severaltracers, we were able to show that their main sources are local primarycombustion sources. Biomass burning emissions (residential heating) have asignificant impact on OC concentrations while heavy duty traffic emissionshave an impact only on EC concentrations. Finally, we estimated thecontribution of SOA (secondary organic carbon) to OC, using the EC-to-OCprimary ratio method (Castro et al., 1999) and demonstrated that thecalculation of SOA mass with this method is highly uncertain, if thehypothesis of a constant primary EC-to-OC ratio is not very closelyexamined.
机译：在两年半的时间里，每天在法国阿尔卑斯山两个山谷（夏蒙尼和圣让·德·毛里安）的两个城市站点采集PM 10 样品。分析了含碳物质EC（元素碳）和OC（有机碳），以调查EC和OC的可能来源及其季节性变化。平均OC浓度在其他欧洲站点测得的浓度范围内非常高，并且代表每个站点至少PM 10 质量的三分之一。在对EC和OC浓度与几种示踪剂进行比较的基础上，我们能够证明它们的主要来源是当地的主要燃烧源。生物质燃烧排放物（住宅供暖）对OC浓度有显着影响，而重型交通排放仅对EC浓度有影响。最后，我们使用EC与OC的主要比率方法（Castro等，1999）估算了SOA（次要有机碳）对OC的贡献，并证明了如果假设A的假设，则用这种方法计算SOA的质量是高度不确定的。恒定的主要EC与OC比率不是很严格的检查。

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