DOI: 10.1175/JCLI-D-11-00726.1
Scopus记录号: 2-s2.0-84870014753
论文题名: Model-specific radiative kernels for calculating cloud and noncloud climate feedbacks
作者: Sanderson B.M. ; Shell K.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 21 起始页码: 7607
结束页码: 7624
语种: 英语
Scopus关键词: Climate sensitivity
; Cloud radiative forcing
; Cloud retrieval
; Community atmosphere model
; General circulation model
; International satellite cloud climatology projects
; Long waves
; Midlatitudes
; Physics simulation
; Radiative fluxes
; Radiative forcings
; Single kernel
; Southern ocean
; Statistical optimizing
; Statistical techniques
; Strong nonlinearity
; Surface albedo
; Atmospheric radiation
; Climate change
; Clouds
; Feedback
; Optimization
; Climate models
; albedo
; cirrus
; climate change
; climate feedback
; climate modeling
; cloud radiative forcing
; general circulation model
; longwave radiation
; sensitivity analysis
; stratocumulus
; stratus
; Southern Ocean
英文摘要: Radiative kernels have become a common tool for evaluating and comparing radiative feedbacks to climate change in different general circulation models. However, kernel feedback calculations are inaccurate for simulations where the atmosphere is significantly perturbed from its base state, such as for very large forcing or perturbed physics simulations. In addition, past analyses have not produced kernels relating to prognostic cloud variables because of strong nonlinearities in their relationship to radiative forcing. A new methodology is presented that allows for fast statistical optimizing of existing kernels such that accuracy is increased for significantly altered climatologies. International Satellite Cloud Climatology Project (ISCCP) simulator output is used to relate changes in cloud-type histograms to radiative fluxes. With minimal additional computation, an individual set of kernels is created for each climate experiment such that climate feedbacks can be reliably estimated even in significantly perturbed climates. This methodology is applied to successive generations of the Community Atmosphere Model (CAM).Increased climate sensitivity in CAM5 is shown to be due to reduced negative stratus and stratocumulus feedbacks in the tropics and midlatitudes, strong positive stratus feedbacks in the southern oceans, and a strengthened positive longwave cirrus feedback. Results also suggest that CAM5 exhibits a stronger surface albedo feedback than its predecessors, a feature not apparent when using a single kernel. Optimized kernels for CAM5 suggest weaker global-mean shortwave cloud feedback than one would infer from using the original kernels and an adjusted cloud radiative forcing methodology. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52147
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO, United States; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Sanderson B.M.,Shell K.M.. Model-specific radiative kernels for calculating cloud and noncloud climate feedbacks[J]. Journal of Climate,2012-01-01,25(21)