Size-resolved hygroscopicity of submicrometer urban aerosols in Shanghai during wintertime
Size-resolved hygroscopicity of submicrometer urban aerosols in Shanghai during wintertime
复制标题
上海冬季亚微米城市气溶胶的尺寸分辨吸湿性
DOI：
10.1016/j.atmosres.2010.11.008
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发表时间：
2011-02
影响因子：
5.5
通讯作者：
Chen, Jianmin
中科院分区：
文献类型：
--
作者：
Ye, Xingnan;Ma, Zhen;Hu, Dawei;Yang, Xin;Chen, Jianmin
吸湿增长因子和混合状态的信息对于理解高污染的长江三角洲灰霾的形成机制具有重要意义。本文研究了上海冬季大气气溶胶的粒径尺度吸湿性。用吸湿串联微分迁移率分析仪（HTDMA）测定了复旦大学校园内直径为30- 250 nm的干颗粒物的吸湿生长因子。观察到含有两个吸湿基团的模态外部混合物。在相对湿度为85%时，低吸湿组的平均吸湿增长因子均小于1.10，低吸湿组的平均数分数在0.33-0.17之间变化，并随干燥粒径的增大而略有减小。吸湿性较强组的平均吸湿性生长因子表明，Aitken模式颗粒与积聚模式颗粒之间存在显著差异，Aitken模式颗粒接近1.3，积聚模式颗粒大于1.4。基于硫酸铵模型，估算出较吸湿颗粒的平均吸湿体积分数在0.47-0.70之间，Aitken和聚集态颗粒的吸湿体积分数之间存在较大差距。吸湿增长对相对湿度的测试不仅表明潮解相对湿度依赖于颗粒的大小，但也揭示了添加硝酸盐的颗粒最初是由硫酸盐缩合促进。结果还表明，大多数积累模式的颗粒物潮解在霾条件下。
Information about the hygroscopic growth factors and mixing state is important for understanding the haze formation mechanism in the highly polluted Yangtze River Delta. Herein, the size-resolved hygroscopicity of ambient aerosols in Shanghai was studied during wintertime. The hygroscopic growth factors were measured using a Hygroscopic Tandem Differential Mobility Analyzer (HTDMA) for dry particles with diameters of 30–250nm on the campus of Fudan University. A modal external mixture containing two hygroscopic groups was observed. The mean hygroscopic growth factors of the less-hygroscopic group at 85% relative humidity were lower than 1.10, and the average number fraction of the less-hygroscopic group varied in the range of 0.33–0.17, decreasing slightly with the increase of dry particle size. The mean hygroscopic growth factors of the more-hygroscopic group showed there was a significant difference between Aitken and accumulation mode particles, nearly 1.3 for Aitken mode particles and above 1.4 for accumulation mode particles. On the basis of the ammonium sulfate model, the average hygroscopic volume fraction of the more-hygroscopic particles was estimated to be in the range of 0.47–0.70, and there was a large gap between the hygroscopic volume fractions of Aitken and accumulation mode particles. The hygroscopic growth against relative humidity test not only showed that deliquescence relative humidity depended on particle size, but also revealed that the addition of nitrate on the particles was initially promoted by sulfate condensation. The results also suggested that most accumulation mode particles were deliquesced under haze conditions.
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影响因子：
5
作者：
Praveen K. Mogili;P. Kleiber;M. A. Young;V. Grassian
通讯作者：
Praveen K. Mogili;P. Kleiber;M. A. Young;V. Grassian
DOI：
10.3402/tellusb.v52i2.16657
发表时间：
2000-01
期刊：
Tellus B: Chemical and Physical Meteorology
影响因子：
--
作者：
S. Gassó;D. Hegg;D. Covert;Don R. Collins;K. Noone;E. Öström;B. Schmid;P. Russell;J. Livingston-J.
通讯作者：
S. Gassó;D. Hegg;D. Covert;Don R. Collins;K. Noone;E. Öström;B. Schmid;P. Russell;J. Livingston-J.
DOI：
10.1021/jp076169h
发表时间：
2008-01
期刊：
The journal of physical chemistry. A
影响因子：
--
作者：
Yong Liu;Elizabeth R. Gibson;J. Cain;Hai Wang;Vicki H. Grassian;A. Laskin
通讯作者：
Yong Liu;Elizabeth R. Gibson;J. Cain;Hai Wang;Vicki H. Grassian;A. Laskin
影响因子：
5.8
作者：
X. Ye;Tianyi Chen;Dawei Hu;Xin Yang;Jianmin Chen;Renyi Zhang;Alexei F. Khakuziv-;Lin Wang
通讯作者：
X. Ye;Tianyi Chen;Dawei Hu;Xin Yang;Jianmin Chen;Renyi Zhang;Alexei F. Khakuziv-;Lin Wang
影响因子：
5
作者：
Lu-Yen Chen;F. Jeng;Chih-Chieh Chen;T. Hsiao
通讯作者：
Lu-Yen Chen;F. Jeng;Chih-Chieh Chen;T. Hsiao