globalchange  > 气候减缓与适应
DOI: 10.1175/JCLI-D-17-0125.1
Scopus记录号: 2-s2.0-85047090990
论文题名:
Improved representation of surface spectral emissivity in a global climate model and its impact on simulated climate
作者: Huang X.; Chen X.; Flanner M.; Yang P.; Feldman D.; Kuo C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期:9
起始页码: 3711
结束页码: 3727
语种: 英语
英文关键词: Climate models ; Energy budget/balance ; Feedback ; Land surface model ; Longwave radiation ; Radiative transfer
Scopus关键词: Atmospheric temperature ; Budget control ; Electromagnetic wave emission ; Feedback ; Heat flux ; Radiative transfer ; Sea ice ; Surface properties ; Atmospheric components ; Energy budget/balance ; Global climate model ; Global mean surface temperature ; Land surface modeling ; Long-wave radiation ; Surface temperature difference ; Top of the atmospheres ; Climate models ; albedo ; climate modeling ; emissivity ; energy balance ; energy budget ; global climate ; land surface ; latent heat flux ; longwave radiation ; polar region ; radiative transfer ; sea ice ; spectral analysis ; surface temperature ; Sahara
英文摘要: Surface longwave emissivity can be less than unity and vary significantly with frequency. However, most climate models still assume a blackbody surface in the longwave (LW) radiation scheme of their atmosphere models. This study incorporates realistic surface spectral emissivity into the atmospheric component of the Community Earth System Model (CESM), version 1.1.1, and evaluates its impact on simulated climate. By ensuring consistency of the broadband surface longwave flux across different components of the CESM, the top-of-the-atmosphere (TOA) energy balance in the modified model can be attained without retuning the model. Inclusion of surface spectral emissivity, however, leads to a decrease of net upward longwave flux at the surface and a comparable increase of latent heat flux. Global-mean surface temperature difference between the modified and standard CESM simulation is 0.20 K for the fully coupled run and 0.45 K for the slab-ocean run. Noticeable surface temperature differences between the modified and standard CESM simulations are seen over the Sahara Desert and polar regions. Accordingly, the climatological mean sea ice fraction in the modified CESM simulation can be less than that in the standard CESM simulation by as much as 0.1 in some regions. When spectral emissivities of sea ice and open ocean surfaces are considered, the broadband LW sea ice emissivity feedback is estimated to be -0.003 W m-2 K-1, assuming flat ice emissivity as sea ice emissivity, and 0.002 W m-2 K-1, assuming coarse snow emissivity as sea ice emissivity, which are two orders of magnitude smaller than the surface albedo feedback. © 2018 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111550
Appears in Collections:气候减缓与适应

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作者单位: Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Division of Climate and Ecosystem Sciences, Lawrence Berkeley Laboratory, Berkeley, CA, United States

Recommended Citation:
Huang X.,Chen X.,Flanner M.,et al. Improved representation of surface spectral emissivity in a global climate model and its impact on simulated climate[J]. Journal of Climate,2018-01-01,31(9)
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