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DOI | 10.1175/JAS-D-17-0241.1 |
Broadening of Cloud Droplet Size Spectra by Stochastic Condensation: Effects of Mean Updraft Velocity and CCN Activation | |
Sardina, Gaetano1,2,3; Poulain, Stephane4,5; Brandt, Luca4,5; Caballero, Rodrigo1,2 | |
2018-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:2页码:451-467 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden |
英文摘要 | The authors study the condensational growth of cloud droplets in homogeneous isotropic turbulence by means of a large-eddy simulation (LES) approach. The authors investigate the role of a mean updraft velocity and of the chemical composition of the cloud condensation nuclei (CCN) on droplet growth. The results show that a mean constant updraft velocity superimposed onto a turbulent field reduces the broadening of the droplet size spectra induced by the turbulent fluctuations alone. Extending the authors' previous results regarding stochastic condensation, the authors introduce a new theoretical estimation of the droplet size spectrum broadening that accounts for this updraft velocity effect. A similar reduction of the spectra broadening is observed when the droplets reach their critical size, which depends on the chemical composition of CCN. The analysis of the square of the droplet radius distribution, proportional to the droplet surface, shows that for large particles the distribution is purely Gaussian, while it becomes strongly non-Gaussian for smaller particles, with the left tail characterized by a peak around the haze activation radius. This kind of distribution can significantly affect the later stages of the droplet growth involving turbulent collisions, since the collision probability kernel depends on the droplet size, implying the need for new specific closure models to capture this effect. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425753300004 |
WOS关键词 | CUMULUS CLOUD ; PART II ; GROWTH ; TURBULENCE ; MODEL ; DISTRIBUTIONS ; MICROPHYSICS ; SIMULATIONS |
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/29271 |
专题 | 地球科学 |
作者单位 | 1.Stockholm Univ, Dept Meteorol, Stockholm, Sweden; 2.Stockholm Univ, Swedish E Sci Res Ctr, Stockholm, Sweden; 3.Chalmers Univ Technol, Div Fluid Dynam, Dept Mech & Maritime Sci, Gothenburg, Sweden; 4.KTH Mech, Linne FLOW Ctr, Stockholm, Sweden; 5.KTH Mech, Swedish E Sci Res Ctr, Stockholm, Sweden |
推荐引用方式 GB/T 7714 | Sardina, Gaetano,Poulain, Stephane,Brandt, Luca,et al. Broadening of Cloud Droplet Size Spectra by Stochastic Condensation: Effects of Mean Updraft Velocity and CCN Activation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(2):451-467. |
APA | Sardina, Gaetano,Poulain, Stephane,Brandt, Luca,&Caballero, Rodrigo.(2018).Broadening of Cloud Droplet Size Spectra by Stochastic Condensation: Effects of Mean Updraft Velocity and CCN Activation.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(2),451-467. |
MLA | Sardina, Gaetano,et al."Broadening of Cloud Droplet Size Spectra by Stochastic Condensation: Effects of Mean Updraft Velocity and CCN Activation".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.2(2018):451-467. |
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