DOI: 10.1002/2017MS001116
Scopus记录号: 2-s2.0-85039061647
论文题名: Mechanism of Fast Atmospheric Energetic Equilibration Following Radiative Forcing by CO2
作者: Dinh T ; , Fueglistaler S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 7 起始页码: 2468
结束页码: 2482
语种: 英语
英文关键词: Atmospheric humidity
; Atmospheric radiation
; Budget control
; Carbon dioxide
; Heat flux
; Surface properties
; Troposphere
; Atmosphere temperature
; Atmospheric circulation
; CO2 forcing
; fast atmospheric adjustment
; General circulation model
; Hydrological cycles
; Near surface temperature
; Tropospheric circulation
; Atmospheric temperature
; air temperature
; atmospheric circulation
; carbon dioxide
; cooling
; flux measurement
; general circulation model
; hydrological cycle
; latent heat flux
; radiative forcing
; sensible heat flux
; surface temperature
; troposphere
英文摘要: In energetic equilibrium, the atmosphere's net radiative divergence (R) is balanced by sensible (S) and latent (L) heat fluxes, i.e., R+S+L=0. Radiative forcing from increasing CO2 reduces R, and the surface warming following an increase in CO2 is largely due to the reduction in atmospheric energy demand in S and L, with only a smaller surface radiative budget perturbation. With an idealized General Circulation Model, we show that the fast atmospheric adjustment at fixed surface temperature produces the required decrease in the sum of S and L through changes in the near-surface temperature and specific humidity. In layers near the surface, the reduced radiative cooling forces a temperature increase that leads to a negative Planck radiative feedback and, because of the reduced surface-atmosphere temperature difference, also to a reduction in sensible heat flux. In the free troposphere, the reduced radiative cooling leads to a weakening of the tropospheric circulation. Consequently, there is a decrease in the water flux exported from the layers near the surface, and as such in precipitation. By mass conservation, the near-surface specific humidity increases and surface evaporation decreases until it balances the reduced export flux. Other processes can amplify or dampen the responses in S and L and change the partitioning between these two fluxes, but by themselves do not ensure R+L+S=0. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75702
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: Department of Physics, University of Auckland, Auckland, New Zealand; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; Department of Geosciences, Princeton University, Princeton, NJ, United States
Recommended Citation:
Dinh T,, Fueglistaler S. Mechanism of Fast Atmospheric Energetic Equilibration Following Radiative Forcing by CO2[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(7)