DOI: 10.1002/2017JD026583
论文题名: Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China
作者: Ma Y. ; Li S. ; Zheng J. ; Khalizov A. ; Wang X. ; Wang Z. ; Zhou Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
语种: 英语
英文关键词: Aerosol
; Black carbon
; Cloud condensation nuclei
; Effective density
; Mixing state
; Yangtze River Delta
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 (κ = 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. ©2017. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62775
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing China; School of Atmospheric Science Nanjing University Nanjing China; Department of Chemistry and Environmental Science New Jersey Institute of Technology Newark, New Jersey USA; Changzhou Environmental Monitoring Center Changzhou China
Recommended Citation:
Ma Y.,Li S.,Zheng J.,et al. Size-resolved measurements of mixing state and cloud-nucleating ability of aerosols in Nanjing, China[J]. Journal of Geophysical Research: Atmospheres,2017-01-01