冬季临安大气本底站气溶胶来源解析及其粒径分布特征

发布时间：2019-03-30 09:50

【摘要】：利用宽范围粒径谱仪(WPS)、EMS系统、KC-120H中流量采样器、850professional IC型离子色谱分析仪和热/光碳分析仪(DRI2001A)分别观测了临安大气本底站2015年1月9~31日10 nm~10μm气溶胶数浓度粒径分布、常规污染气体浓度、PM_(2.5)浓度及水溶性离子和OC、EC的浓度,利用PMF模式对PM_(2.5)进行来源解析,并分析了不同污染源下气溶胶粒子的谱分布及日变化特征.结果表明,临安大气本底站大气气溶胶数浓度平均为5 062 cm~(-3)·nm~(-1),主要集中在10~400 nm.PM_(2.5)的平均浓度和NO_2、SO_2、CO的平均体积分数分别为123.6μg·m~(-3)、22.6×10~(-9)、34.0×10~(-9)和2.2×10~(-6).水溶性离子以NO_3~-、SO_4~(2-)、NH_4~+为主,平均浓度分别为19.2、15.4和10.8μg·m~(-3),分别占总水溶性离子的37.9%、30.4%、21.4%.OC和EC的平均浓度分别为24.4μg·m~(-3)和6.6μg·m~(-3).冬季临安大气本底站PM_(2.5)主要来自二次相关源、燃煤排放、机动车排放、扬尘和生物质燃烧,贡献率分别为42.3%、21.4%、17.1%、8.7%和10.6%.不同来源气溶胶数浓度谱分布差异较大,二次相关、机动车排放、扬尘和生物质燃烧气溶胶数浓度谱均为单峰型分布,峰值分别位于120、50、100和90nm.燃煤颗粒物数浓度谱分布为双峰型分布,峰值分别位于25 nm和100 nm,浓度为19 842 cm~(-3)·nm~(-1)和18 372 cm~(-3)·nm~(-1).二次相关源、燃煤源、机动车排放、扬尘和生物质燃烧表面积浓度谱均为三峰型分布,最大峰值分别位于650、210、160、180和575 nm.不同排放源气溶胶颗粒物数浓度和表面积浓度日变化特征基本一致,多呈双峰型分布,主要受边界层日变化和人类活动影响.
[Abstract]:Using a wide range of particle size spectrometer (WPS), EMS system, KC-120H flow sampler, 850professional IC type ion chromatography analyzer and thermal / optical carbon analyzer (DRI2001A) were used to observe the particle size distribution of 10 nm~ 10 渭 m aerosol number and the concentration of conventional polluted gas in Linan atmospheric background station from 9 to 31 January 2015, respectively. The sources of PM_ (2.5) and water-soluble ions and OC,EC were analyzed by PMF model. The spectral distribution and diurnal variation of aerosol particles under different pollution sources were analyzed. The results show that the average concentration of atmospheric aerosol at Linan atmospheric background station is 5 062 cm~ (- 3) nm~ (- 1), which is mainly concentrated in the average concentration of 10 ~ 400 nm.PM_ (2. 5) and NO_2,SO_2,. The average volume fraction of CO is 123.6 渭 g 路m ~ (- 3), 22.6 脳 10 ~ (- 9), 34.0 脳 10 ~ (- 9) and 2.2 脳 10 ~ (- 6), respectively. The water-soluble ions were mainly NO_3~-,SO_4~ _ (2 -) and NH_4~, the average concentrations were 19.2,15.4 and 10.8渭 g 路m ~ (- 3), accounting for 37.9% and 30.4% of the total water-soluble ions, respectively. The average concentrations of 21.4%.OC and EC were 24.4 渭 g 路m ~ (- 3) and 6.6 渭 g 路m ~ (- 3), respectively. In winter, the PM_ (2.5) of Linan atmospheric background station is mainly from secondary correlation sources. The contribution rates of coal combustion, motor vehicle emissions, dust and biomass combustion are 42.3%, 21.4%, 17.1%, 8.7% and 10.6%, respectively, and the contribution rates are 42.3%, 21.4%, 17.1%, 8.7% and 10.6%, respectively. The distribution of aerosol concentration spectrum of different sources is quite different, secondary correlation, vehicle emission, airborne dust and biomass combustion aerosol concentration spectrum is a single peak distribution, the peak values are 120, 50100 and 90 nm, respectively. The peak values were 19 842 cm~ (- 3) nm~ (- 1) and 18 372 cm~ (- 3) nm~ (- 1) at 25 nm and 100 nm, respectively. Secondary correlation sources, coal combustion sources, motor vehicle emissions, dust and biomass combustion surface area concentration spectra are all three peak distributions, with maximum peaks located at 650210160180 and 575 nm., respectively. The diurnal variation characteristics of aerosol particle number concentration and surface area concentration of different emission sources are basically the same, most of them are double peak distribution, which is mainly influenced by the diurnal variation of boundary layer and human activities.
【作者单位】：南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室;杭州市环境监测中心站;蚌埠市气象局;
【基金】：国家自然科学基金项目(91544229) 国家重点研发计划项目(2016YFA0602003) 南京信息工程大学人才启动经费资助项目(2016r040)
【分类号】：X513

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