新疆阿克达拉大气背景点气溶胶物质来源研究

文章利用2004年7月~2005年3月间新疆阿克达拉区域大气本底观测站PM10和TSP有机碳、元素碳及水溶性离子的组成数据,分别采用主成分分析法(Principal Component Analysis,PCA)和绝对主成分分析法(Absolutely Principal Component Analysis,APCA)对大气气溶胶物质来源进行研究。结果表明PM10中气溶胶来源及贡献率分别为:人为污染源(49.6%)、地壳矿物质粉尘(17.3%)、盐渍化地壳矿物质粉尘(33.1%);TSP中气溶胶来源及贡献率分别为:盐渍化地壳矿物质粉尘(21.3%)、地壳矿物质粉尘及人为污染混合源(50.8%)、人为污染源(27.8%)。由于阿克达拉大气本底观测站位于我国气候上游,该站PM10和TSP中不同来源物质贡献率的源解析结果对于研究中国西北地区大气背景气溶胶的特性及其气候效应具有重要意义,对我国西北边境大气背景区空气污染治理对策的制定有一定的参考价值。

Source Apportionment of Atmospheric Aerosol at Background Site Akdala, Xinjiang

Concentrations of organic carbon,elemental carbon and water soluble ions of atmospheric aerosol samples including PM10 and TSP collected at a background site Akdala in Xinjiang Prefecture during July 2004~March 2005 were analyzed by principal component analysis and absolutely principal component analysis to make source apportionment.Results indicated that three main sources were identified for PM10,including anthropogenic pollution source,crustal mineral dust and salinized crustal mineral dust,which contributed to 49.6%,17.3% and 33.1% of mass concentration respectively.Three main sources for TSP were salinized crustal mineral dust,crustal mineral dust-anthropogenic emission mixed,and anthropogenic pollution source,which contributed to 21.3% ,50.8% and 27.8% of mass concentration respectively.Source apportionment results are helpful to implementing air quality improvement strategies in northwestern China.