DOI: 10.1175/JCLI-D-18-0103.1
Scopus记录号: 2-s2.0-85053071343
论文题名: The influence of meridional gradients in insolation and longwave optical depth on the climate of a gray radiation GCM
作者: Lutsko N.J. ; Popp M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 7803
结束页码: 7822
语种: 英语
英文关键词: Climate models
; Climatology
; Planetary atmospheres
; Radiative forcing
; Radiative-convective equilibrium
; Surface temperature
Scopus关键词: Atmospheric radiation
; Atmospheric temperature
; Climatology
; Global warming
; Incident solar radiation
; Optical properties
; Surface properties
; General circulation model
; Global mean surface temperature
; Planetary atmosphere
; Radiative forcings
; Radiative-convective equilibrium
; Regional surface temperature
; Surface temperature gradient
; Surface temperatures
; Climate models
英文摘要: The relative contributions of the meridional gradients in insolation and in longwave optical depth (caused by gradients in water vapor) to the equator-to-pole temperature difference, and to Earth's climate in general, have not been quantified before. As a first step to understanding these contributions, this study investigates simulations with an idealized general circulation model in which the gradients are eliminated individually or jointly, while keeping the global means fixed. The insolation gradient has a larger influence on the model's climate than the gradient in optical depth, but both make sizeable contributions and the changes are largest when the gradients are reduced simultaneously. Removing either gradient increases global-mean surface temperature due to an increase in the tropospheric lapse rate, while the meridional surface temperature gradients are reduced. "Global warming" experiments with these configurations suggest similar climate sensitivities; however, the warming patterns and feedbacks are quite different. Changes in the meridional energy fluxes lead to polar amplification of the response in all but the setup in which both gradients are removed. The lapse-rate feedback acts to polar amplify the responses in the Earth-like setup, but is uniformly negative in the other setups. Simple models are used to interpret the results, including a prognostic model that can accurately predict regional surface temperatures, given the meridional distributions of insolation and longwave optical depths. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110657
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Laboratoire de Météorologique Dynamique, Sorbonne Université, Paris, France
Recommended Citation:
Lutsko N.J.,Popp M.. The influence of meridional gradients in insolation and longwave optical depth on the climate of a gray radiation GCM[J]. Journal of Climate,2018-01-01,31(19)