DOI: 10.1175/JCLI-D-12-00519.1
Scopus记录号: 2-s2.0-84880261516
论文题名: Consistent differences in climate feedbacks between Atmosphere-ocean GCMs and atmospheric GCMs with slab-ocean models
作者: Shell K.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 12 起始页码: 4264
结束页码: 4281
语种: 英语
Scopus关键词: Atmosphere ocean general circulation models
; Climate sensitivity
; Coupled Model Intercomparison Project
; Influence on climate
; Meridional heat transports
; Radiative fluxes
; Special report on emissions scenarios
; Water vapor feedbacks
; Carbon dioxide
; Feedback
; Solar radiation
; Temperature
; Tropics
; Water vapor
; Climate models
; air temperature
; albedo
; atmospheric general circulation model
; climate change
; climate feedback
; climate modeling
; heat transfer
; oceanic general circulation model
; radiative forcing
; relative humidity
; temperature anomaly
; water vapor
英文摘要: Climate sensitivity is generally studied using two types of models. Atmosphere-ocean general circulation models (AOGCMs) include interactive ocean dynamics and detailed heat uptake. Atmospheric GCMs (AGCMs) with slab ocean models (SOMs) cannot fully simulate the ocean's response to and influence on climate. However, AGCMs are computationally cheaper and thus are often used to quantify and understand climate feedbacks and sensitivity. Here, physical climate feedbacks are compared between AOGCMs and SOM-AGCMs from the Coupled Model Intercomparison Project phase 3 (CMIP3) using the radiative kernel technique. Both the global-average (positive) water vapor and (negative) lapse-rate feedbacks are consistently stronger in AOGCMs. Water vapor feedback differences result from an essentially constant relative humidity and peak in the tropics, where temperature changes are larger for AOGCMs. Differences in lapserate feedbacks extend to midlatitudes and correspond to a larger ratio of tropical- to global-average temperature changes. Global-average surface albedo feedbacks are similar between models types because of a near cancellation of Arctic and Antarctic differences. In AOGCMs, the northern high latitudes warm faster than the southern latitudes, resulting in interhemispheric differences in albedo, water vapor, and lapse-rate feedbacks lacking in the SOM-AGCMs. Meridional heat transport changes also depend on the model type, although there is a large intermodel spread. However, there are no consistent global or zonal differences in cloud feedbacks. Effects of the forcing scenario [Special Report on Emissions Scenarios A1B (SRESa1b) or the 1% CO2 increase per year to doubling (1%to2x) experiments] on feedbacks are model dependent and generally of lesser importance than the model type. Care should be taken when using SOM-AGCMs to understand AOGCM feedback behavior. © 2013 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51838
Appears in Collections: 气候变化事实与影响
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作者单位: College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin. Bldg., Corvallis, OR 97331-5503, United States
Recommended Citation:
Shell K.M.. Consistent differences in climate feedbacks between Atmosphere-ocean GCMs and atmospheric GCMs with slab-ocean models[J]. Journal of Climate,2013-01-01,26(12)