Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0030.1 |
On the Computation of Apparent Direct Solar Radiation | |
Raisanen, Petri; Lindfors, Anders V. | |
2019-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:9页码:2761-2780 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland |
英文摘要 | Near-forward-scattered radiation coming from the vicinity of the sun's direction impacts the interpretation of measurements of direct solar radiation by pyrheliometers and sun photometers, and it is also relevant for concentrating solar technology applications. Here, a Monte Carlo radiative transfer model is employed to study the apparent direct solar transmittance t(alpha), that is, the transmittance measured by an instrument that receives the radiation within a half-field-of-view (half-FOV) angle alpha from the center of the solar disk, for various ice cloud, water cloud, and aerosol cases. The contribution of scattered radiation to t(alpha) increases with increasing particle size, and it also depends strongly on ice crystal morphology. The Monte Carlo calculations are compared with a simple approach, in which t(alpha) is estimated through Beer's law, using a scaled optical depth that excludes the part of the phase function corresponding to scattering angles smaller than alpha. Overall, this optical depth scaling approach works very well, although with some degradation of the performance for ice clouds for very small half-FOV angles (alpha < 0.5 degrees-1 degrees), and in optically thick cases. The errors can be reduced by fine-tuning the optical depth scaling factors based on the Monte Carlo results. Parameterizations are provided for computing the optical depth scaling factors for water clouds, ice clouds, aerosols, and for completeness, Rayleigh scattering to allow for a simple calculation of t(alpha). It is also shown that the optical depth scaling used in delta-two-stream approximations is inappropriate for simulating the direct solar radiation received by pyrheliometers. |
英文关键词 | Radiative transfer Shortwave radiation Parameterization |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000482414900001 |
WOS关键词 | CIRCUMSOLAR RADIATION ; SUN PHOTOMETRY ; CLOUDS ; TRANSMISSION ; AEROSOLS |
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/186797 |
专题 | 地球科学 |
作者单位 | Finnish Meteorol Inst, Helsinki, Finland |
推荐引用方式 GB/T 7714 | Raisanen, Petri,Lindfors, Anders V.. On the Computation of Apparent Direct Solar Radiation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(9):2761-2780. |
APA | Raisanen, Petri,&Lindfors, Anders V..(2019).On the Computation of Apparent Direct Solar Radiation.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(9),2761-2780. |
MLA | Raisanen, Petri,et al."On the Computation of Apparent Direct Solar Radiation".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.9(2019):2761-2780. |
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