金沙秋季PM2.5污染特征及影响因素分析
Analysis on Pollution Characteristics and Influencing Factors of PM2.5 in Autumn of Jinsha
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摘要: 文章对2013年9~11月金沙区域大气本底站的PM2.5连续在线数据日变化和同期的气象资料的平均日变化进行了分析,并与过去的5年同期数据进行对比分析。结果表明:金沙区域秋季PM2.5质量浓度有明显的日变化规律,受局地排放和气象条件的共同影响,颗粒物质量浓度在凌晨、夜间显著上升。降水对PM2.5的清除量与初始质量浓度、降水量均呈正相关关系,金沙站的云下清除更多取决于PM2.5的初始质量浓度;风向风速对细颗粒物影响明显,来自金沙站北部和东部的气流使大气颗粒物质量浓度升高,而来自西部和南部的风使大气颗粒物浓度降低,大于7 m/s的东风对PM2.5有稀释作用,而北风对细颗粒物几乎无稀释作用。Abstract: Compared with the data of same period in the past 5 years, the daily changes of PM2.5 continuous collected by Atmospheric Background Station in Jinsha Region from September to November in 2013 and the average daily changes of meteorological data in the same period were analyzed in this paper. The results indicated the mass concentration of PM2.5 in Jinsha Region in autumn presented an obvious diurnal variation rule. Affected by local emission and meteorological conditions, the mass concentration of particulate matters increased significantly in the morning and at night. The elimination quantity of PM2.5 by precipitation presented a positive correlation with initial mass concentration and amount of precipitation. The elimination below clouds of Jinsha Station depended more on the initial mass concentration of PM2.5. Wind direction and wind speed had obvious effects on fine particles matters. The airstream from north and east of Jinsha Station made the mass concentration of atmospheric particulate matters rise, while the wind from west and south made the mass concentration of particulate matters decline. East wind with speed greater than 7 m/s could dilute PM2.5, while north wind could hardly have any dilution effect on the fine particulate matters.
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Key words:
- PM2.5 /
- Wind Direction /
- Wind Speed /
- Precipitation /
- Relevancy
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