سابِق|تال

Preliminary research on sky polarization and influential factors

  • role： First author第一作者
  • Affiliation：

    College of Geoscience and Surveying Engineering, China University of Mining & Technology (Beijing) Beijing 100083, China

    Beijing Key Laboratory of Spatial Information Itegration and 3S Application, Peking University, Beijing 100871, China

  • Email：chenw@cumtb.edu.cn
  • Introduction：陈伟，1987年生，男，副教授，研究方向为偏振遥感及气溶胶环境遥感。E-mail：chenw@cumtb.edu.cn
Wei CHEN12,  
  • Affiliation：

    Beijing Key Laboratory of Spatial Information Itegration and 3S Application, Peking University, Beijing 100871, China

    Institute of Remote Sensing and GIS, Peking University, Beijing 100871, China

  • Email：lyan@pku.edu.cn
Yanfei LI23,  
  • Affiliation：

    School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Taixia WU4,  
  • Affiliation：

    Information Engineering College, Capital Normal University, Beijing 100048, China

Guixia GUAN5

ملخص

This paper discusses the status of full sky polarization pattern and the major factors affecting its strength. These factors are Aerosol Optical Depth (AOD) and aerosol models (described by the single scattering properties of aerosol particles). The different results of AOD and aerosol models are demonstrated. A relatively stable and regular sky polarization pattern is suggested to exist in the sky centering the position of the sun through the comprehensive results of incident solar light with underlying surface and atmosphere. This complex process can be described and calculated by vector radiative transfer models with the output of polarization components. The full sky polarization signals exhibit a certain regular distribution in the sky. The strength and pattern of full sky polarization are affected by the combination of surface reflective properties (including polarized reflectance and bidirectional reflectance), atmosphere molecule-scattering properties, and aerosol optical properties. This study simulated different full sky polarization patterns under various AOD conditions based on vector radiative transfer models. For example, the underlying surface is assumed to be an ocean surface. The land surface is omitted in this study because its basic pattern is similar to that of the ocean surface. The single scattering properties of dust nonspherical and soot nonspherical aerosol particles were calculated using a TMatrix-Geo model. Phase functions and other single scattering properties were then obtained as the basic inputs of vector radiative transfer model. Results demonstrated a relatively stable sky polarization pattern centering the direction of incident solar light. However, different effects were observed between dust and soot aerosol on full sky polarization pattern. The increase in dust-scattering AOD weakens the pattern of sky polarization from a maximum degree of polarization of 50% to less than 30%. Meanwhile, an increase in soot-absorbing AOD strengthens the pattern of sky polarization from the maximum degree of polarization of 50% to >70%. With the bimodel (mixture of dust and soot aerosol) aerosol model, the sky polarization patterns were systematically analyzed with different ratios of soot-to-dust aerosols. The basic sky polarization pattern is suggested to still exist in the sky, but the strength is influenced by both aerosol model and AOD. With increased soot AOD, sky polarization tends to increase despite the total AOD being the same. When retrieving aerosol optic properties with sky polarization pattern, paying attention to the selection of aerosol model information is necessary.

مفهوم

polarization;polarization field;aerosol;sky polarization pattern

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