DOI: 10.1002/2015JD024738
论文题名: A Lagrangian view of longwave radiative fluxes for understanding the direct heating response to a CO2 increase
作者: Sejas S.A. ; Cai M. ; Liu G. ; Taylor P.C. ; Tung K.-K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 11 起始页码: 6191
结束页码: 6214
语种: 英语
英文关键词: anthropogenic radiative forcing
; climate change
; radiative transfer
; stratosphere cooling
Scopus关键词: anthropogenic effect
; carbon dioxide
; climate change
; cooling
; heat flux
; heating
; Lagrangian analysis
; longwave radiation
; radiative forcing
; radiative transfer
; spatial variation
; stratosphere
英文摘要: This study puts forward a Lagrangian view of downward and upward longwave (LW) fluxes to improve our physical understanding of the influence of key factors on the downward and upward LW fluxes' response to an increase of CO2. To facilitate such a Lagrangian view, we introduce a new saturation-level concept based on the LW radiative transfer theory. The Lagrangian view and the new saturation-level concept enable us to provide, under a single framework, a general radiative transfer explanation of the spatial variation (e.g., stratospheric cooling and lower tropospheric warming) of the direct radiative heating response to an increase of the CO2 concentration. Following the saturation-level concept, the radiatively unsaturated nature of the downward LW flux in the upper stratosphere, due to the lack of a LW source at the top of the atmosphere, is attributed as the root factor that leads to a cooling of the upper stratosphere in direct response to a CO2 increase. The upward LW flux perturbation further enhances the cooling as a result of the negative lapse rate in the stratosphere but is of secondary importance. Furthermore, this study indicates that ozone is not a necessary ingredient for stratospheric cooling to occur, and the stratospheric cooling is therefore a fundamental consequence of a CO2 increase. The unperturbed vertical profile of water vapor is important only in the lower troposphere, where the relatively large concentration of water vapor leads to a downward LW flux perturbation that warms the lower troposphere at the expense of the surface warming. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62853
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; NASA Langley Research Center, Hampton, VA, United States; Department of Applied Mathematics, University of Washington, Seattle, WA, United States
Recommended Citation:
Sejas S.A.,Cai M.,Liu G.,et al. A Lagrangian view of longwave radiative fluxes for understanding the direct heating response to a CO2 increase[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(11)