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DOI | 10.1002/2017GL076721 |
Sensitivity of Homogeneous Ice Nucleation to Aerosol Perturbations and Its Implications for Aerosol Indirect Effects Through Cirrus Clouds | |
Liu, X.1; Shi, X.1,2 | |
2018-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:3页码:1684-1691 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | The magnitude and sign of anthropogenic aerosol impacts on cirrus clouds through ice nucleation are still very uncertain. In this study, aerosol sensitivity (eta(alpha)), defined as the sensitivity of the number concentration (N-i) of ice crystals formed from homogeneous ice nucleation to aerosol number concentration (N-a), is examined based on simulations from a cloud parcel model. The model represents the fundamental process of ice crystal formation that results from homogeneous nucleation. We find that the geometric dispersion (sigma) of the aerosol size distribution used in the model is a key factor for eta(alpha). For a monodisperse size distribution, eta(alpha) is close to zero in vertical updrafts (V < 50 cm s(-1)) typical of cirrus clouds. However, eta(alpha) increases to 0.1-0.3 (i.e., N-i increases by a factor of 1.3-2.0 for a tenfold increase in N-a) if aerosol particles follow lognormal size distributions with a sigma of 1.6-2.3 in the upper troposphere. By varying the input aerosol and environmental parameters, our model reproduces a large range of eta(alpha) values derived from homogeneous ice nucleation parameterizations widely used in global climate models (GCMs). The differences in eta(alpha) from these parameterizations can translate into a range of anthropogenic aerosol longwave indirect forcings through cirrus clouds from 0.05 to 0.36 W m(-2) with a GCM. Our study suggests that a larger eta(alpha) (0.1-0.3) is more plausible and the homogeneous nucleation parameterizations should include a realistic aerosol size distribution to accurately quantify anthropogenic aerosol indirect effects. |
英文关键词 | ice nucleation aerosol indirect effect |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426161800058 |
WOS关键词 | COMMUNITY ATMOSPHERE MODEL ; UPPER TROPOSPHERE ; PARAMETERIZATION ; NUCLEI ; CAM5 ; MICROPHYSICS ; TEMPERATURE ; MECHANISMS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28303 |
专题 | 气候变化 |
作者单位 | 1.Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA; 2.Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, X.,Shi, X.. Sensitivity of Homogeneous Ice Nucleation to Aerosol Perturbations and Its Implications for Aerosol Indirect Effects Through Cirrus Clouds[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(3):1684-1691. |
APA | Liu, X.,&Shi, X..(2018).Sensitivity of Homogeneous Ice Nucleation to Aerosol Perturbations and Its Implications for Aerosol Indirect Effects Through Cirrus Clouds.GEOPHYSICAL RESEARCH LETTERS,45(3),1684-1691. |
MLA | Liu, X.,et al."Sensitivity of Homogeneous Ice Nucleation to Aerosol Perturbations and Its Implications for Aerosol Indirect Effects Through Cirrus Clouds".GEOPHYSICAL RESEARCH LETTERS 45.3(2018):1684-1691. |
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