GSTDTAP  > 地球科学
DOI10.1175/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
ISSN0022-4928
EISSN1520-0469
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
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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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