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DOI | 10.1175/JAS-D-18-0246.1 |
Diffusivity-Factor Approximation for Spectral Outgoing Longwave Radiation | |
Feng, Jing; Huang, Yi | |
2019-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:7页码:2171-2180 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Accurate integration of directional radiance shows that the conventional diffusivity-factor approximation with a constant diffusivity angle results in an overestimation of the outgoing longwave radiation (OLR) in the window band and an underestimation in the absorption band. We propose an analytical estimation of a spectrally dependent diffusivity angle for clear-sky spectral OLR, considering actual atmospheric conditions and realistic optical path geometry. Beginning with the plane-parallel geometry, we present a new, physical explanation of the conventional diffusivity angle that applies to the gas absorption bands and derives an alternative solution for the window bands. Then a correction scheme is developed to account for the impact of the spherical Earth geometry on the diffusivity angle. The proposed method achieves higher accuracy, reducing biases to generally less than 2% in all spectral regions. |
英文关键词 | Atmosphere Climate sensitivity Irradiance Longwave radiation Radiative transfer Satellite observations |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000473637800002 |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184749 |
专题 | 地球科学 |
作者单位 | McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Feng, Jing,Huang, Yi. Diffusivity-Factor Approximation for Spectral Outgoing Longwave Radiation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(7):2171-2180. |
APA | Feng, Jing,&Huang, Yi.(2019).Diffusivity-Factor Approximation for Spectral Outgoing Longwave Radiation.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(7),2171-2180. |
MLA | Feng, Jing,et al."Diffusivity-Factor Approximation for Spectral Outgoing Longwave Radiation".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.7(2019):2171-2180. |
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