Size-resolved effective density of urban aerosols in Shanghai
Size-resolved effective density of urban aerosols in Shanghai
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上海城市气溶胶尺寸分辨有效密度
DOI：
10.1016/j.atmosenv.2014.10.055
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发表时间：
2015
影响因子：
5
通讯作者：
陈建民
中科院分区：
文献类型：
--
作者：
陶冶;施洋;杨新;陈建民
利用TDMA-APM系统测定了冬季上海市50 ~ 400 nm城市颗粒物的粒径分辨有效密度。平均有效密度为1.36 ~ 1.55 g cm−3，随粒径增大而增大。密度随尺寸的增加与先前的吸湿测量结果一致。我们将密度的增加归因于吸湿性二次气溶胶和大型有机物的凝结。对于较小的颗粒，有效密度的日变化很明显。颗粒密度与次级nh4no3和（NH4） 2so4对PM1.0的贡献具有相似的日变化规律，表明颗粒密度随颗粒组成的变化而变化。在NPF事件期间，艾特肯模式粒子的有效密度有相当大的增加，这与硫酸盐的贡献一致。粒子质量分布由粒子数分布结合有效密度导出。pm0.6与PM1.0高度相关，表明二次气溶胶倾向于凝结在更小的颗粒上。
Size-resolved effective density of 50–400 nm urban particles was determined by a TDMA–APM system in Shanghai during wintertime. The average effective density ranged from 1.36 to 1.55 g cm−3, increasing with the particle diameter. The size dependent increase of density was consistent with previous hygroscopic measurements. We attributed the increase in density to the condensation of hygroscopic secondary aerosols and large massive organics. The diurnal variation of effective density was pronounced for smaller particles. A similar diurnal pattern was observed between particle density and the contribution of secondary NH4NO3and (NH4)2SO4to PM1.0, suggesting that density change in response to particle compositions. The effective density of Aitken mode particles had a considerable increase during the NPF event, in agreement with the contribution of sulfate. Particle mass distribution was derived from particle number distribution in combination with effective density. PM0.6was highly correlated with PM1.0, revealing that secondary aerosols tend to condense on smaller particles.
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影响因子：
6.3
作者：
Paasonen, P.;Nieminen, T.;Kulmala, M.
通讯作者：
Kulmala, M.
影响因子：
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作者：
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影响因子：
5.5
作者：
Ye, Xingnan;Ma, Zhen;Hu, Dawei;Yang, Xin;Chen, Jianmin
通讯作者：
Chen, Jianmin
影响因子：
5
作者：
S. Nakao;P. Tang;Xiaochen Tang;Christopher H. Clark;Li Qi;Eric Seo;A. Asa-Awuku;D. Cocker
通讯作者：
S. Nakao;P. Tang;Xiaochen Tang;Christopher H. Clark;Li Qi;Eric Seo;A. Asa-Awuku;D. Cocker
影响因子：
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Dingli Yue;Min Hu;Zhijun Wu;Zhibin Wang;Song Guo;B. Wehner;A. Nowak;P. Achtert;A. Wiedensohler-A.-Wie
通讯作者：
Dingli Yue;Min Hu;Zhijun Wu;Zhibin Wang;Song Guo;B. Wehner;A. Nowak;P. Achtert;A. Wiedensohler-A.-Wie