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首页> 外文期刊>Atmospheric environment >Identification and estimation of the biomass burning contribution to Beijing aerosol using levoglucosan as a molecular marker
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Identification and estimation of the biomass burning contribution to Beijing aerosol using levoglucosan as a molecular marker

机译：以左旋葡聚糖为分子标记鉴定和估算生物质燃烧对北京气溶胶的贡献

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摘要

Two series of size-selective aerosol samples, PM2.5 and PM10, were collected in Beijing from July 2002 to July 2003. The samples were analyzed for levoglucosan and related saccharidic compounds, organic and elemental carbon, and ionic species. Levoglucosan and related saccharidic compounds were mostly present in the fine size fraction. The contribution from biomass burning to the carbonaceous aerosol in Beijing was estimated; biomass burning was responsible for 18-38% of the PM2.5 organic carbon and for 14-32% of the PM10 organic carbon. The biomass burning marker levoglucosan was present all year round in Beijing. High levoglucosan concentrations in October and November were attributed to corn field burning and burning of fallen leaves, while the high level observed on 7 May 2003 was tracked back to a boreal forest fire more than 1000 km away in northeastern China. The biomass burning contribution to the Beijing aerosol is made up of two parts, a background component, which is due to biofuel burning all year round in the neighboring countryside households, and a superimposed component from seasonal crop burning events and wild fires.
机译：2002年7月至2003年7月在北京收集了两个尺寸选择的气溶胶样品，分别是PM2.5和PM10。分析了样品中的左旋葡聚糖及其相关糖类化合物，有机和元素碳以及离子种类。左旋葡聚糖和相关的糖类化合物大多以细小颗粒形式存在。估计了北京生物质燃烧对碳质气溶胶的贡献；生物质燃烧占PM2.5有机碳的18-38％和PM10有机碳的14-32％。生物质燃烧标记左旋葡聚糖常年出现在北京。 10月和11月左旋葡聚糖的高浓度归因于玉米田燃烧和落叶燃烧，而2003年5月7日观测到的高水平可追溯到中国东北1000多公里以外的北方森林大火。对北京气溶胶的生物质燃烧贡献由两个部分组成，一个是背景成分，这是由于邻近农村家庭全年都在燃烧生物燃料，另一个是季节性作物燃烧事件和野火的叠加。

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