DOI: 10.1007/s00382-015-2957-7
Scopus记录号: 2-s2.0-84952666613
论文题名: Estimation of convective entrainment properties from a cloud-resolving model simulation during TWP-ICE
作者: Zhang G.J. ; Wu X. ; Zeng X. ; Mitovski T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2177
结束页码: 2192
语种: 英语
英文关键词: Cloud resolving model simulation of convection
; Entrainment rates
; LES
英文摘要: The fractional entrainment rate in convective clouds is an important parameter in current convective parameterization schemes of climate models. In this paper, it is estimated using a 1-km-resolution cloud-resolving model (CRM) simulation of convective clouds from TWP-ICE (the Tropical Warm Pool-International Cloud Experiment). The clouds are divided into different types, characterized by cloud-top heights. The entrainment rates and moist static energy that is entrained or detrained are determined by analyzing the budget of moist static energy for each cloud type. Results show that the entrained air is a mixture of approximately equal amount of cloud air and environmental air, and the detrained air is a mixture of ~80 % of cloud air and 20 % of the air with saturation moist static energy at the environmental temperature. After taking into account the difference in moist static energy between the entrained air and the mean environment, the estimated fractional entrainment rate is much larger than those used in current convective parameterization schemes. High-resolution (100 m) large-eddy simulation of TWP-ICE convection was also analyzed to support the CRM results. It is shown that the characteristics of entrainment rates estimated using both the high-resolution data and CRM-resolution coarse-grained data are similar. For each cloud category, the entrainment rate is high near cloud base and top, but low in the middle of clouds. The entrainment rates are best fitted to the inverse of in-cloud vertical velocity by a second order polynomial. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53523
Appears in Collections: 过去全球变化的重建
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作者单位: Scripps Institution of Oceanography, La Jolla, CA, United States; Iowa State University, Ames, IA, United States; The Goddard Earth Sciences Technology and Research (GESTAR), Morgan State University, Baltimore, MD, United States
Recommended Citation:
Zhang G.J.,Wu X.,Zeng X.,et al. Estimation of convective entrainment properties from a cloud-resolving model simulation during TWP-ICE[J]. Climate Dynamics,2016-01-01,47(2017-07-08)