globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017MS000993
Scopus记录号: 2-s2.0-85029396832
论文题名:
A cloudy planetary boundary layer oscillation arising from the coupling of turbulence with precipitation in climate simulations
作者: Zheng X; , Klein S; A; , Ma H; -Y; , Caldwell P; , Larson V; E; , Gettelman A; , Bogenschutz P
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:4
起始页码: 1973
结束页码: 1993
语种: 英语
英文关键词: Atmospheric thermodynamics ; Bins ; Boundary layers ; Climate models ; Clouds ; Evaporation ; Moisture ; Parameterization ; Rain ; Climate simulation ; Cloud layers ; cloudy PBL oscillations ; Community atmosphere model ; Cumulus cloud ; Global simulation ; Moisture transport ; Planetary boundary layers ; Precipitation (meteorology) ; altitude ; atmospheric modeling ; boundary layer ; climate modeling ; cloud microphysics ; cumulus ; parameterization ; precipitation (climatology) ; simulation
英文摘要: The Community Atmosphere Model (CAM) adopts Cloud Layers Unified By Binormals (CLUBB) scheme and an updated microphysics (MG2) scheme for a more unified treatment of cloud processes. This makes interactions between parameterizations tighter and more explicit. In this study, a cloudy planetary boundary layer (PBL) oscillation related to interaction between CLUBB and MG2 is identified in CAM. This highlights the need for consistency between the coupled subgrid processes in climate model development. This oscillation occurs most often in the marine cumulus cloud regime. The oscillation occurs only if the modeled PBL is strongly decoupled and precipitation evaporates below the cloud. Two aspects of the parameterized coupling assumptions between CLUBB and MG2 schemes cause the oscillation: (1) a parameterized relationship between rain evaporation and CLUBB's subgrid spatial variance of moisture and heat that induces an extra cooling in the lower PBL and (2) rain evaporation which happens at a too low an altitude because of the precipitation fraction parameterization in MG2. Either one of these two conditions can overly stabilize the PBL and reduce the upward moisture transport to the cloud layer so that the PBL collapses. Global simulations prove that turning off the evaporation-variance coupling and improving the precipitation fraction parameterization effectively reduces the cloudy PBL oscillation in marine cumulus clouds. By evaluating the causes of the oscillation in CAM, we have identified the PBL processes that should be examined in models having similar oscillations. This study may draw the attention of the modeling and observational communities to the issue of coupling between parameterized physical processes. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75741
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: Cloud Processes Research Group, Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Mathematical Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, United States; National Center for Atmospheric Research, Boulder, CO, United States

Recommended Citation:
Zheng X,, Klein S,A,et al. A cloudy planetary boundary layer oscillation arising from the coupling of turbulence with precipitation in climate simulations[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(4)
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