GSTDTAP  > 地球科学
DOI10.1175/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
ISSN0022-4928
EISSN1520-0469
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
被引频次:66[WOS]   [WOS记录]     [WOS相关记录]
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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