Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-8343-2017 |
On the limits of Kohler activation theory: how do collision and coalescence affect the activation of aerosols? | |
Hoffmann, Fabian | |
2017-07-10 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Activation is necessary to form a cloud droplet from an aerosol, and it is widely accepted that it occurs as soon as a wetted aerosol grows beyond its critical radius. Traditional Kohler theory assumes that this growth is driven by the diffusion of water vapor. However, if the wetted aerosols are large enough, the coalescence of two or more particles is an additional process for accumulating sufficient water for activation. This transition from diffusional to collectional growth marks the limit of traditional Kohler theory and it is studied using a Lagrangian cloud model in which aerosols and cloud droplets are represented by individually simulated particles within large-eddy simulations of shallow cumuli. It is shown that the activation of aerosols larger than 0.1 mu m in dry radius can be affected by collision and coalescence, and its contribution increases with a power-law relation toward larger radii and becomes the only process for the activation of aerosols larger than 0.4-0.8 mu m depending on aerosol concentration. Due to the natural scarcity of the affected aerosols, the amount of aerosols that are activated by collection is small, with a maximum of 1 in 10000 activations. The fraction increases as the aerosol concentration increases, but decreases again as the number of aerosols becomes too high and the particles too small to cause collections. Moreover, activation by collection is found to affect primarily aerosols that have been entrained above the cloud base. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405302200001 |
WOS关键词 | WARM RAIN INITIATION ; KINETIC LIMITATIONS ; DROPLET FORMATION ; MODEL ; MICROPHYSICS ; SIMULATION ; CLOUDS ; PARTICLES ; VERSION ; ALBEDO |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/22796 |
专题 | 地球科学 |
作者单位 | Leibniz Univ Hannover, Inst Meteorol & Climatol, Hannover, Germany |
推荐引用方式 GB/T 7714 | Hoffmann, Fabian. On the limits of Kohler activation theory: how do collision and coalescence affect the activation of aerosols?[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(13). |
APA | Hoffmann, Fabian.(2017).On the limits of Kohler activation theory: how do collision and coalescence affect the activation of aerosols?.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(13). |
MLA | Hoffmann, Fabian."On the limits of Kohler activation theory: how do collision and coalescence affect the activation of aerosols?".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.13(2017). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Hoffmann, Fabian]的文章 |
百度学术 |
百度学术中相似的文章 |
[Hoffmann, Fabian]的文章 |
必应学术 |
必应学术中相似的文章 |
[Hoffmann, Fabian]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论