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DOI | 10.1175/JAS-D-18-0014.1 |
Improvement of the Simulation of Cloud Longwave Scattering in Broadband Radiative Transfer Models | |
Tang, Guanglin1; Yang, Ping1; Kattawar, George W.2,3; Huang, Xianglei4; Mlawer, Eli J.5; Baum, Bryan A.6; King, Michael D.1,7 | |
2018-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:7页码:2217-2233 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Cloud longwave scattering is generally neglected in general circulation models (GCMs), but it plays a significant and highly uncertain role in the atmospheric energy budget as demonstrated in recent studies. To reduce the errors caused by neglecting cloud longwave scattering, two new radiance adjustment methods are developed that retain the computational efficiency of broadband radiative transfer simulations. In particular, two existing scaling methods and the two new adjustment methods are implemented in the Rapid Radiative Transfer Model (RRTM). The results are then compared with those based on the Discrete Ordinate Radiative Transfer model (DISORT) that explicitly accounts for multiple scattering by clouds. The two scaling methods are shown to improve the accuracy of radiative transfer simulations for optically thin clouds but not effectively for optically thick clouds. However, the adjustment methods reduce computational errors over a wide range, from optically thin to thick clouds. With the adjustment methods, the errors resulting from neglecting cloud longwave scattering are reduced to less than 2 W m(-2) for the upward irradiance at the top of the atmosphere and less than 0.5 W m(-2) for the surface downward irradiance. The adjustment schemes prove to be more accurate and efficient than a four-stream approximation that explicitly accounts for multiple scattering. The neglect of cloud longwave scattering results in an underestimate of the surface downward irradiance (cooling effect), but the errors are almost eliminated by the adjustment methods (warming effect). |
英文关键词 | Atmosphere Cirrus clouds Cloud radiative effects Radiative fluxes Radiative transfer Climate models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435438400002 |
WOS关键词 | MULTIPLE-SCATTERING ; ACCURATE PARAMETERIZATION ; CLIMATE MODELS ; CIRRUS CLOUDS ; SATELLITE ; IMPACT ; ATMOSPHERES ; RETRIEVALS ; EMISSIVITY ; ABSORPTION |
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/29580 |
专题 | 地球科学 |
作者单位 | 1.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA; 2.Texas A&M Univ, Dept Phys & Astron, College Stn, TX USA; 3.Texas A&M Univ, Inst Quantum Sci & Engn, College Stn, TX USA; 4.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA; 5.Atmospher & Environm Res Inc, 840 Mem Dr, Cambridge, MA 02139 USA; 6.Univ Wisconsin Madison, Space Sci & Engn Ctr, Madison, WI USA; 7.Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Tang, Guanglin,Yang, Ping,Kattawar, George W.,et al. Improvement of the Simulation of Cloud Longwave Scattering in Broadband Radiative Transfer Models[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(7):2217-2233. |
APA | Tang, Guanglin.,Yang, Ping.,Kattawar, George W..,Huang, Xianglei.,Mlawer, Eli J..,...&King, Michael D..(2018).Improvement of the Simulation of Cloud Longwave Scattering in Broadband Radiative Transfer Models.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(7),2217-2233. |
MLA | Tang, Guanglin,et al."Improvement of the Simulation of Cloud Longwave Scattering in Broadband Radiative Transfer Models".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.7(2018):2217-2233. |
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