Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027058 |
Uncertainty in Predicting CCN Activity of Aged and Primary Aerosols | |
Zhang, Fang1,2; Wang, Yuying1; Peng, Jianfei3,4; Ren, Jingye1; Collins, Don3; Zhang, Renyi3,4; Sun, Yele5,6; Yang, Xin1; Li, Zhanqing1,7,8 | |
2017-11-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:21 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Understanding particle CCN activity in diverse atmospheres is crucial when evaluating aerosol indirect effects. Here aerosols measured at three sites in China were categorized as different types for attributing uncertainties in CCN prediction in terms of a comprehensive data set including size-resolved CCN activity, size-resolved hygroscopic growth factor, and chemical composition. We show that CCN activity for aged aerosols is unexpectedly underestimated -22% at a supersaturation (S) of 0.2% when using kappa-Kohler theory with an assumption of an internal mixture with measured bulk composition that has typically resulted in an overestimate of the CCN activity in previous studies. We conclude that the underestimation stems from neglect of the effect of aging/coating on particle hygroscopicity, which is not considered properly in most current models. This effect enhanced the hygroscopicity parameter (kappa) by between similar to 11% (polluted conditions) and 30% (clean days), as indicated in diurnal cycles of kappa based on measurements by different instruments. In the urban Beijing atmosphere heavily influenced by fresh emissions, the CCN activity was overestimated by 45% at S=0.2%, likely because of inaccurate assumptions of particle mixing state and because of variability of chemical composition over the particle size range. For both fresh and aged aerosols, CCN prediction exhibits very limited sensitivity to kappa(SOA), implying a critical role of other factors like mixing of aerosol components within and between particles in regulating CCN activity. Our findings could help improving CCN parameterization in climate models. |
英文关键词 | CCN activity aerosol hygroscopicity coating effect CCN closure |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417195500004 |
WOS关键词 | CLOUD CONDENSATION NUCLEI ; POSITIVE MATRIX FACTORIZATION ; SIZE-RESOLVED HYGROSCOPICITY ; SECONDARY ORGANIC AEROSOL ; DROPLET GROWTH-KINETICS ; NORTH CHINA PLAIN ; MIXING STATE ; CHEMICAL-COMPOSITION ; PARTICLE HYGROSCOPICITY ; ACTIVATION PROPERTIES |
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/32499 |
专题 | 气候变化 |
作者单位 | 1.Beijing Normal Univ, Coll Global Change & Earth Syst Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; 2.Joint Ctr Global Change Studies, Beijing, Peoples R China; 3.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX USA; 4.Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA; 5.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing, Peoples R China; 6.Univ Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China; 7.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA; 8.Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Zhang, Fang,Wang, Yuying,Peng, Jianfei,et al. Uncertainty in Predicting CCN Activity of Aged and Primary Aerosols[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(21). |
APA | Zhang, Fang.,Wang, Yuying.,Peng, Jianfei.,Ren, Jingye.,Collins, Don.,...&Li, Zhanqing.(2017).Uncertainty in Predicting CCN Activity of Aged and Primary Aerosols.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(21). |
MLA | Zhang, Fang,et al."Uncertainty in Predicting CCN Activity of Aged and Primary Aerosols".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.21(2017). |
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