气溶胶空间非均匀性对近红外辐射传输的影响分析

为了解气溶胶空间非均匀性对近红外辐射传输过程的影响, 构造了典型非均匀气溶胶场, 采用辐射传输模式球谐离散坐标法(SHDOM)模拟了对应情形下的漫射光强、偏振特性以及辐射通量密度, 定量分析了将非均匀气溶胶场等效为均匀场造成的模拟误差。研究结果表明, 气溶胶非均匀场对辐射传输过程影响显著, 且它对漫射光偏振辐亮度的影响大于它对辐亮度的影响, 其中气溶胶空间非均匀性造成的辐亮度及偏振辐亮度模拟误差分别可达9.8%和80%。气溶胶水平非均匀性主要影响漫射光辐亮度及偏振辐亮度模拟误差的空间分布特征, 垂直不均匀性基本不改变漫射光模拟误差的空间分布特征, 但它对辐射传输过程的影响明显大于水平不均匀性。随着气溶胶浓度的增加, 气溶胶非均匀性造成的模拟误差整体降低。从量级上, 气溶胶空间非均匀性对辐射通量密度的影响明显弱于漫射光辐亮度和偏振辐亮度, 多数情形下, 其模拟误差小于5%, 且该误差随高度的变化呈特定分布特征。可为平面平行大气辐射传输模式适用范围的确定, 气溶胶空间非均匀性导致的遥感误差的评估提供一定参考。

Abstract

To investigate the influence of inhomogeneous aerosol field on radiative transfer process in near-infrared band, representative inhomogeneous aerosol fields are constructed, and the radiance, polarized radiance and flux density of the diffuse light are simulated by the radiative transfer model spectral harmonics discrete ordinary method (SHDOM) for different aerosol fields. In addition, the simulation error caused by taking the inhomogeneous aerosol fields as plane-parallel ones is analyzed numerically as well. Simulation results indicate that, inhomogeneous distribution of the aerosol particles has significant influence on the radiative transfer, and the simulation error of the polarized radiance caused by the inhomogeneity of the aerosol field is higher than that of radiance, where the simulation error of radiance and polarized radiance can reach 9.8% and 80%, respectively. Horizontal inhomogeneity of the aerosol field has a great influence on the simulation error distribution of radiance and polarized radiance, while the vertical inhomogeneity has a more notable effect on the radiative transfer process and has no significant influence on the distribution. As the aerosol concentration increases, simulation error caused by the inhomogeneity of aerosol fields gradually decreases. The simulation error of flux density is smaller than that of radiance and polarized radiance in magnitude, which is less than 5% for most case. It is also found that the variation of the simulation error with height shows specific distribution characteristics. This work will be helpful for both the determination of applicable scope of the plane-parallel atmospheric radiative transfer models and the estimation of error caused by the aerosol field inhomogeneity in remote sensing process.

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陈鸣, 胡帅, 高太长, 李浩, 程天际, 刘磊, 喻学峰. 气溶胶空间非均匀性对近红外辐射传输的影响分析[J]. 光学学报, 2017, 37(1): 0101003. Chen Ming, Hu Shuai, Gao Taichang, Li Hao, Cheng Tianji, Liu Lei, Yu Xuefeng. Study on the Effect of Inhomogeneous Aerosol Fields on Radiative Transfer Process in Near-Infrared Band[J]. Acta Optica Sinica, 2017, 37(1): 0101003.

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