• Acta Photonica Sinica
  • Vol. 49, Issue 12, 180 (2020)
Yin ZHANG1、2, Jun MA1、2, Jun-hua YAN1、2、*, Hao YAN1、2, Xi-yang ZHI3, and Jin-nan GONG3
Author Affiliations
  • 1Key Laboratory of Space Photoelectric Detection and Perception, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing206, China
  • 2College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing11106, China
  • 3Research Center of Space Optical Engineering, Harbin Institute of Technology, Harbin150001, China
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    DOI: 10.3788/gzxb20204912.1229001 Cite this Article
    Yin ZHANG, Jun MA, Jun-hua YAN, Hao YAN, Xi-yang ZHI, Jin-nan GONG. Approximate Model of Three-dimensional Clouds Multiple Scattering Based on Finitely Adjacent-cloud Radiative Transfer[J]. Acta Photonica Sinica, 2020, 49(12): 180 Copy Citation Text show less

    Abstract

    In view of the high computational cost of radiative transfer for three-dimensional clouds in high-resolution detections, an approximate model of multiple scattering based on finitely adjacent-cloud was proposed. According to the radiative coupling law between adjacent clouds in different spatial positions, the finitely adjacent-cloud was divided into horizontally and vertically adjacent fields of clouds. The equation of variation for horizontal flux density was introduced to calculate the horizontal radiation exchange, thus characterize the radiative effects between horizontally adjacent fields of clouds. Regarding the error of flux along vertical direction, the function of compensation for flux density was used to correct it to more accurately characterize the radiative effect caused by vertically adjacent fields of clouds. A three-dimensional field of cumulus was selected as experimental scene, and the independent pixel approximation and the multiple scattering (calculated by the Eddington’s approximation) which combined with standard single scattering were compared. Experimental results show that the proposed model can improve the accuracies of upward and downward source functions by up to 47.39% and 33.93%, and the improvements are more than 8% and 10% when solar zenith angle is less than 60°; under different illuminating and observing conditions, mean relative errors of intensity for the proposed model are less than 40%; in terms of computational efficiency, the proposed model has significant advantage, which is helpful to research the rapid solution of radiative transfer in large-scale scenarios.
    Yin ZHANG, Jun MA, Jun-hua YAN, Hao YAN, Xi-yang ZHI, Jin-nan GONG. Approximate Model of Three-dimensional Clouds Multiple Scattering Based on Finitely Adjacent-cloud Radiative Transfer[J]. Acta Photonica Sinica, 2020, 49(12): 180
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