DOI: 10.1002/2015MS000456
Scopus记录号: 2-s2.0-84944906486
论文题名: A Lagrangian drop model to study warm rain microphysical processes in shallow cumulus
作者: Naumann A ; K ; , Seifert A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 3 起始页码: 1136
结束页码: 1154
语种: 英语
英文关键词: Clouds
; Drops
; Lagrange multipliers
; Large eddy simulation
; Rain
; Bulk microphysics
; Dynamical effects
; Lagrangian particles
; Microphysical process
; Raindrop size distribution
; Sensitivity studies
; Shallow cumulus clouds
; Surface precipitation
; Precipitation (meteorology)
; cumulus
; Eulerian analysis
; Lagrangian analysis
; large eddy simulation
; model test
; parameterization
; precipitation (climatology)
; raindrop
; uncertainty analysis
英文摘要: In this study, we introduce a Lagrangian drop (LD) model to study warm rain microphysical processes in shallow cumulus. The approach combines Large-Eddy Simulations (LES) including a bulk microphysics parameterization with an LD model for raindrop growth. The LD model is one-way coupled with the Eulerian LES and represents all relevant rain microphysical processes such as evaporation, accretion, and selfcollection among LDs as well as dynamical effects such as sedimentation and inertia. To test whether the LD model is fit for purpose, a sensitivity study for isolated shallow cumulus clouds is conducted. We show that the surface precipitation rate and the development of the raindrop size distribution are sensitive to the treatment of selfcollection in the LD model. Some uncertainty remains for the contribution of the subgrid-scale turbulence to the relative velocity difference of a pair of LDs, which appears as a factor in the collision kernel. Sensitivities to other model parameters such as the initial multiplicity or the initial mass distribution are small. Overall, sensitivities of the LD model are small compared to the uncertainties in the assumptions of the bulk rain microphysics scheme, and the LD model is well suited for particle-based studies of raindrop growth and dynamics. This opens up the opportunity to study effects like recirculation, deviations from terminal fall velocity and other microphysical phenomena that so far were not accessible for bin, bulk, or parcel models. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75997
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; Hans-Ertel Centre for Weather Research, Deutscher Wetterdienst, Hamburg, Germany
Recommended Citation:
Naumann A,K,, Seifert A. A Lagrangian drop model to study warm rain microphysical processes in shallow cumulus[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)