Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD026583 |
Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China | |
Ma, Yan1; Li, Shizheng1,2; Zheng, Jun1; Khalizov, Alexei3; Wang, Xing1; Wang, Zhen4; Zhou, Yaoyao1 | |
2017-09-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | An integrated aerosol analytical system was deployed in Nanjing, a megacity in the Yangtze River Delta, to measure size-resolved aerosol mixing states, effective densities, cloud condensation nucleus (CCN) activities, and chemical composition in August 2013. It was found that aerosols were predominantly internally mixed. The average effective densities were 1.38 +/- 0.09, 1.48 +/- 0.08, and 1.53 +/- 0.07 g cm(-3) for 50, 80, and 120 nm particles, respectively. Although black carbon (BC) represented only 0.3%, 1.6%, and 3.3% of the particle mass, on average, it was present in 7%, 38%, and 47% of the total particle number concentration at 50, 80, and 120 nm, respectively, indicating that BC particles may contribute significantly to the total atmospheric aerosol population. Externally mixed BC was only occasionally observed with an effective density of 0.67-0.97 g cm(-3). Aerosols sampled generally exhibited a relatively high CCN activity and hygroscopicity (kappa = 0.35 +/- 0.13). Both newly formed particles and freshly emitted BC particles were observed to age rapidly from photochemical processes, with a significant enhancement in the particle CCN activity and an increase in the effective density. Aerosols influenced by four different air masses presented similar CCN activation, indicating that CCN activation would be primarily dependent on the particle size rather than the particle origin (and hence original composition). Our results suggest that under highly active photochemical conditions as encountered in this study, particles from both local sources and regional transport can be rapidly converted into efficient CCN by photochemical aging, thereby making important contributions to the atmospheric CCN budget and exerting profound implications on aerosol indirect climate forcing. Plain Language Summary We present the online field observation of size-resolved aerosol mixing state and cloud nucleating abilities in Nanjing, a megacity in the Yangtze River Delta of China. The results show that under conditions of highly active photochemistry, aerosols were predominantly internally mixed. Cloud condensation nucleus (CCN) activation would be primarily dependent on the particle size rather than the particle origin (and hence original composition), likely as a result of rapid aging in the atmosphere. The findings of this work suggest that initially CCN inactive, newly formed, and freshly emitted primary particles can be rapidly converted into efficient CCN by photochemical processes, thereby making important contributions to the atmospheric CCN budget. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416387300029 |
WOS关键词 | YANGTZE-RIVER DELTA ; CONDENSATION NUCLEI CCN ; BLACK CARBON AEROSOL ; MEGA-CITY GUANGZHOU ; OPTICAL-PROPERTIES ; LIGHT-ABSORPTION ; EFFECTIVE DENSITY ; AIR-POLLUTION ; PART 1 ; ATMOSPHERIC PARTICLES |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33785 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Jiangsu Key Lab Atmospher Environm Monitoring & P, Collaborat Innovat Ctr Atmospher Environm & Equip, Sch Environm Sci & Engn, Nanjing, Jiangsu, Peoples R China; 2.Nanjing Univ, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China; 3.New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA; 4.Changzhou Environm Monitoring Ctr, Changzhou, Peoples R China |
推荐引用方式 GB/T 7714 | Ma, Yan,Li, Shizheng,Zheng, Jun,et al. Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(17). |
APA | Ma, Yan.,Li, Shizheng.,Zheng, Jun.,Khalizov, Alexei.,Wang, Xing.,...&Zhou, Yaoyao.(2017).Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(17). |
MLA | Ma, Yan,et al."Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.17(2017). |
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