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于2008-12-30～2009-12-25,在深圳市宝安区、罗湖区和盐田区各设置一个采样点采集大气细粒子PM2.5,分析了PM2.5中主要的水溶性离子组分、有机碳和元素碳,同时结合气象条件,对深圳市PM2.5的化学组成及时空分布特征进行了研究.结果表明,深圳市PM2.5污染总体上呈现西高东低的空间分布特点,但是SO24-和NH4+的空间差异不大,说明深圳PM2.5污染具有明显的区域传输特征.OC/EC值自西向东逐渐升高,说明深圳西部地区受一次源排放影响更为显著.受亚热带海洋性季风气候的影响,深圳市PM2.5总体污染程度表现为秋冬高、夏春低的特点,各主要组分的质量浓度变化也均有类似的特征.与2004年深圳的类似观测结果比较发现,该地区脱硫措施显著降低了PM2.5中硫酸盐浓度,而机动车尾气对PM2.5的贡献变得更加重要.
At 2008-12-30 ~ 2009-12-25, PM2.5 was collected from a sampling point in Bao’an District, Luohu District and Yantian District of Shenzhen City. The main water-soluble ionic components in PM2.5 , Organic carbon and elemental carbon, combined with meteorological conditions, the chemical composition and temporal-spatial distribution characteristics of PM2.5 in Shenzhen were studied.The results showed that the PM2.5 pollution in Shenzhen showed a spatial distribution characteristic of west-east and low-east, The spatial distribution of SO2 2- and NH4 + is not large, which shows that the PM2.5 pollution in Shenzhen has obvious regional transmission characteristics.The value of OC / EC gradually increases from west to east, which indicates that the source of emissions from a source in western Shenzhen is more significant.From the subtropical ocean The monsoon climate, the overall pollution degree of PM2.5 in Shenzhen is characterized by high autumn and winter, low summer and spring, and similar changes in the mass concentration of the main components.Compared with the similar observations in Shenzhen in 2004, The desulfurization measures in this area significantly reduce the sulfate concentration in PM2.5, and the contribution of motor vehicle exhaust to PM2.5 becomes even more important.