DOI: 10.1002/2017MS000968
Scopus记录号: 2-s2.0-85021736685
论文题名: Toward low-cloud-permitting cloud superparameterization with explicit boundary layer turbulence
作者: Parishani H ; , Pritchard M ; S ; , Bretherton C ; S ; , Wyant M ; C ; , Khairoutdinov M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 3 起始页码: 1542
结束页码: 1571
语种: 英语
英文关键词: Atmospheric thermodynamics
; Boundary layers
; Coastal zones
; Turbulence
; Cloud resolving model
; General circulation model
; Marine boundary layers
; Shallow clouds
; Superparameterization
; Ultraparameterization
; Climate models
; boundary layer
; climate modeling
; cloud microphysics
; convection
; general circulation model
; global climate
; parameterization
; satellite data
; simulation
; spacing
; stratocumulus
; turbulence
; volcanic cloud
英文摘要: Systematic biases in the representation of boundary layer (BL) clouds are a leading source of uncertainty in climate projections. A variation on superparameterization (SP) called “ultraparameterization” (UP) is developed, in which the grid spacing of the cloud-resolving models (CRMs) is fine enough (250 × 20 m) to explicitly capture the BL turbulence, associated clouds, and entrainment in a global climate model capable of multiyear simulations. UP is implemented within the Community Atmosphere Model using 2° resolution (∼14,000 embedded CRMs) with one-moment microphysics. By using a small domain and mean-state acceleration, UP is computationally feasible today and promising for exascale computers. Short-duration global UP hindcasts are compared with SP and satellite observations of top-of-atmosphere radiation and cloud vertical structure. The most encouraging improvement is a deeper BL and more realistic vertical structure of subtropical stratocumulus (Sc) clouds, due to stronger vertical eddy motions that promote entrainment. Results from 90 day integrations show climatological errors that are competitive with SP, with a significant improvement in the diurnal cycle of offshore Sc liquid water. Ongoing concerns with the current UP implementation include a dim bias for near-coastal Sc that also occurs less prominently in SP and a bright bias over tropical continental deep convection zones. Nevertheless, UP makes global eddy-permitting simulation a feasible and interesting alternative to conventionally parameterized GCMs or SP-GCMs with turbulence parameterizations for studying BL cloud-climate and cloud-aerosol feedback. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75753
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: Department of Earth System Science, University of California, Irvine, CA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States
Recommended Citation:
Parishani H,, Pritchard M,S,et al. Toward low-cloud-permitting cloud superparameterization with explicit boundary layer turbulence[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(3)