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DOI10.1016/j.jqsrt.2016.05.004
Quantification of the errors associated with the representation of surface emissivity in the RRTMG_LW
Cheng, Hongze; Chen, Xiuhong; Huang, Xianglei
通讯作者Huang, Xianglei
来源期刊JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
ISSN0022-4073
EISSN1879-1352
出版年2016
卷号180页码:167-176
英文摘要

Recent studies have shown that representation of surface spectral emissivity has a non negligible impact on the polar radiation budget and on simulated climate. This fact motivates the inclusion of surface spectral emissivity into the radiative transfer scheme employed in the climate models. Using a line-by-line radiative transfer model, LBLRTM, as a benchmark, we quantify the errors due to the approximation of surface spectral emissivity in the RRTMG_LW, a radiation scheme widely used by climate models and numerical forecast models. Error quantifications are done using representative sounding profiles in the tropics, mid-latitude summer, sub-arctic winter and Sahara desert interfaced with either ocean or desert spectral emissivities. Though including surface emissivity causes little difference in broadband outgoing longwave radiation, it can cause noticeable differences in longwave radiative cooling rate from surface to 700 hPa. Compared to the benchmark, the largest deviation in radiative cooling rate usually happens at the lowest atmospheric layers next to the surface, ranging from -0.23 K/day to 0.19 K/day with the largest fractional difference being -16.22%. The discrepancies caused solely by the representation of surface emissivity are confined at the lowest atmospheric layer. Using the emissivity at the diffusive angle or the hemispherically averaged emissivity can affect the calculation accuracy, especially for strongly anisotropic surface emission. The band-by-band contribution to the discrepancies between the RRTMG_LW and benchmark reveals compensating errors among the bands used in the RRTMG_LW. (C) 2016 Elsevier Ltd. All rights reserved.


英文关键词Surface spectral emissivity Longwave radiative cooling rate Radiation budget LBLRTM RRTMG_LW Climate models
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000378461100018
WOS关键词TRANSFER MODEL LBLRTM ; RADIATIVE-TRANSFER ; PERFORMANCE ; TEMPERATURE ; LONGWAVE ; WATER
WOS类目Optics ; Spectroscopy
WOS研究方向Optics ; Spectroscopy
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/194713
作者单位Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA
推荐引用方式
GB/T 7714
Cheng, Hongze,Chen, Xiuhong,Huang, Xianglei. Quantification of the errors associated with the representation of surface emissivity in the RRTMG_LW[J],2016,180:167-176.
APA Cheng, Hongze,Chen, Xiuhong,&Huang, Xianglei.(2016).Quantification of the errors associated with the representation of surface emissivity in the RRTMG_LW.JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER,180,167-176.
MLA Cheng, Hongze,et al."Quantification of the errors associated with the representation of surface emissivity in the RRTMG_LW".JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 180(2016):167-176.
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