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DOI | 10.1073/pnas.2006426117 |
The role of turbulent fluctuations in aerosol activation and cloud formation | |
Prasanth Prabhakaran; Abu Sayeed Md Shawon; Gregory Kinney; Subin Thomas; Will Cantrell; Raymond A. Shaw | |
2020-07-08 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2020 |
英文摘要 | Aerosol indirect effects are one of the leading contributors to cloud radiative properties relevant to climate. Aerosol particles become cloud droplets when the ambient relative humidity (saturation ratio) exceeds a critical value, which depends on the particle size and chemical composition. In the traditional formulation of this problem, only average, uniform saturation ratios are considered. Using experiments and theory, we examine the effects of fluctuations, produced by turbulence. Our measurements, from a multiphase, turbulent cloud chamber, show a clear transition from a regime in which the mean saturation ratio dominates to one in which the fluctuations determine cloud properties. The laboratory measurements demonstrate cloud formation in mean-subsaturated conditions (i.e., relative humidity <100%) in the fluctuation-dominant activation regime. The theoretical framework developed to interpret these measurements predicts a transition from a mean- to a fluctuation-dominated regime, based on the relative values of the mean and standard deviation of the environmental saturation ratio and the critical saturation ratio at which aerosol particles activate or become droplets. The theory is similar to the concept of stochastic condensation and can be used in the context of the atmosphere to explore the conditions under which droplet activation is driven by fluctuations as opposed to mean supersaturation. It provides a basis for future development of cloud droplet activation parameterizations that go beyond the internally homogeneous parcel calculations that have been used in the past. |
领域 | 地球科学 |
URL | 查看原文 |
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/283319 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Prasanth Prabhakaran,Abu Sayeed Md Shawon,Gregory Kinney,et al. The role of turbulent fluctuations in aerosol activation and cloud formation[J]. Proceedings of the National Academy of Science,2020. |
APA | Prasanth Prabhakaran,Abu Sayeed Md Shawon,Gregory Kinney,Subin Thomas,Will Cantrell,&Raymond A. Shaw.(2020).The role of turbulent fluctuations in aerosol activation and cloud formation.Proceedings of the National Academy of Science. |
MLA | Prasanth Prabhakaran,et al."The role of turbulent fluctuations in aerosol activation and cloud formation".Proceedings of the National Academy of Science (2020). |
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