DOI: 10.1007/s00382-011-1174-2
Scopus记录号: 2-s2.0-84861829512
论文题名: Impact of improved representation of horizontal and vertical cloud structure in a climate model
作者: Shonk J.K.P. ; Hogan R.J. ; Manners J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-11-12 起始页码: 2365
结束页码: 2376
语种: 英语
英文关键词: Cloud structure
; Exponential-random overlap
; Tripleclouds
英文摘要: Many studies have investigated the effects that misrepresentation of sub-grid cloud structure can have on the radiation budget. In this study, we perform 20-year simulations of the current climate using an atmosphere-only version of the Met Office Unified Model to investigate the effects of cloud approximation on model climate. We apply the "Tripleclouds" scheme for representing horizontal cloud inhomogeneity and "exponential-random" overlap, both separately and in combination, in place of a traditional plane-parallel representation with maximum-random overlap, to the clouds within the radiation scheme. The resulting changes to both the radiation budget and other meteorological variables, averaged over the 20 years, are compared. The combined global effect of the parameterizations on top-of-atmosphere short-wave and long-wave radiation budget is less than 1 W m-2, but changes of up to 10 W m-2 are identified in marine stratocumulus regions. A cooling near the surface over the winter polar regions of up to 3°C is also identified when horizontal cloud inhomogeneity is represented, and a warming of similar magnitude is found when exponential-random overlap is implemented. Corresponding changes of the same sign are also found in zonally averaged temperature, with maximum changes in the upper tropical troposphere of up to 0.5°C. Changes in zonally averaged cloud fraction in this location were of opposite sign and up to 0.02. The individual effects on tropospheric temperature of improving the two components of cloud structure are of similar magnitudes to about 2% of the warming created by a quadrupling of carbon dioxide. © 2011 Crown Copyright. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55266
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Meteorology, University of Reading, Earley Gate, Reading RG6 6BB Berkshire, United Kingdom; Met Office, Fitzroy Road, Exeter EX1 3PB Devon, United Kingdom
Recommended Citation:
Shonk J.K.P.,Hogan R.J.,Manners J.. Impact of improved representation of horizontal and vertical cloud structure in a climate model[J]. Climate Dynamics,2012-01-01,38(2017-11-12)