DOI: 10.1002/2014MS000341
Scopus记录号: 2-s2.0-85027918346
论文题名: Impact of changes in the formulation of cloud-related processes on model biases and climate feedbacks
作者: Lacagnina C ; , Selten F ; , Siebesma A ; P
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期: 4 起始页码: 1224
结束页码: 1243
语种: 英语
英文关键词: Clouds
; Earth (planet)
; Feedback
; Global warming
; Uncertainty analysis
; Cloud feedbacks
; Cloud optical thickness
; Cloud radiative effects
; Feedback parameters
; Mass exchange rates
; Model configuration
; Model uncertainties
; Uncertain parameters
; Climate models
; climate modeling
; global warming
; numerical model
; optical property
; parameterization
; precipitation (climatology)
; shortwave radiation
; stratocumulus
英文摘要: To test the impact of modeling uncertainties and biases on the simulation of cloud feedbacks, several configurations of the EC-Earth climate model are built altering physical parameterizations. An overview of the various radiative feedbacks diagnosed from the reference EC-Earth configuration is documented for the first time. The cloud feedback is positive and small. While the total feedback parameter is almost insensitive to model configuration, the cloud feedback, in particular its shortwave (SW) component, can vary considerably depending on the model settings. The lateral mass exchange rate of penetrative convection and the conversion rate from condensed water to precipitation are leading uncertain parameters affecting the radiative feedbacks diagnosed. Consistent with other studies, we find a strong correlation between low-cloud model fidelity and low-cloud response under global warming. It is shown that this relationship holds only for stratocumulus regimes and is contributed by low-cloud cover, rather than low-cloud optical thickness. Model configurations simulating higher stratocumulus cover, which is closer to the observations, exhibit a stronger positive SW cloud feedback. This feedback is likely underestimated in the reference EC-Earth configuration, over the eastern basins of the tropical oceans. In addition, connections between simulated high-cloud top altitude in present-day climate and longwave cloud feedback are discussed. © 2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76077
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: Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Recommended Citation:
Lacagnina C,, Selten F,, Siebesma A,et al. Impact of changes in the formulation of cloud-related processes on model biases and climate feedbacks[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(4)