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DOI | 10.1175/JAS-D-17-0043.1 |
Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations | |
Grabowski, Wojciech W.1,2; Abade, Gustavo C.2 | |
2017-05-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Poland |
英文摘要 | This paper investigates spectral broadening of droplet size distributions through a mechanism referred to as the eddy hopping. The key idea, suggested a quarter century ago, is that droplets arriving at a given location within a turbulent cloud follow different trajectories and thus experience different growth histories and that this leads to a significant spectral broadening. In this study, the adiabatic parcel model with superdroplets is used to contrast droplet growth with and without turbulence. Turbulence inside the parcel is described by two parameters: (i) the dissipation rate of the turbulent kinetic energy epsilon and (ii) the linear extent of the parcel L. As expected, an adiabatic parcel without turbulence produces extremely narrow droplet spectra. In the turbulent parcel, a stochastic scheme is used to account for vertical velocity fluctuations that lead to local supersaturation fluctuations for each superdroplet. These fluctuations mimic the impact of droplets hopping turbulent eddies in a natural cloud. For L smaller than a few meters, noticeable spectral broadening is possible only for strong turbulence-say, epsilon > 100 cm(2) s(-3). For L typical for grid lengths of large-eddy simulation (LES) models (say, L between 10 and 100 m), the impact is significant even with relatively modest turbulence intensities. The impact increases with both L and epsilon. The representation of eddy hopping developed in this paper can be included in a straightforward way in the subgrid-scale scheme of a Lagrangian LES cloud model and may lead to a significant acceleration of simulated rain development through collision-coalescence. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400730900008 |
WOS关键词 | WARM CUMULUS CLOUD ; SIZE DISTRIBUTIONS ; GROWTH ; MICROSTRUCTURE ; CONDENSATION ; MICROPHYSICS ; ENTRAINMENT ; MODEL ; ENVIRONMENT ; EVOLUTION |
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/29210 |
专题 | 地球科学 |
作者单位 | 1.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 2.Univ Warsaw, Inst Geophys, Fac Phys, Warsaw, Poland |
推荐引用方式 GB/T 7714 | Grabowski, Wojciech W.,Abade, Gustavo C.. Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(5). |
APA | Grabowski, Wojciech W.,&Abade, Gustavo C..(2017).Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(5). |
MLA | Grabowski, Wojciech W.,et al."Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.5(2017). |
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