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首页> 外文会议>Remote Sensing of the Marine Environment; Proceedings of SPIE-The International Society for Optical Engineering; vol.6406 >Estimation of Aerosol altitude from reflectance ratio measurements in the O_2 A-band
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Estimation of Aerosol altitude from reflectance ratio measurements in the O_2 A-band

机译：从O_2 A波段的反射比测量值估算气溶胶高度

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摘要

A methodology is presented to estimate aerosol altitude from reflectance ratio measurements in the O_2 absorption A-band. Previous studies have shown the impact of the vertical distribution of scatterers on the reflectance ratio. The reflectance ratio is defined as the ratio of the reflectance in a first spectral band, strongly attenuated by O_2 absorption, to the reflectance in a second spectral band, minimally attenuated. First, a sensitivity study is performed to quantify the expected accuracy for various aerosol loadings and models. An accurate, high spectral resolution, radiative transfer model that fully accounts for interactions between scattering and absorption is used in the simulations. Due to their adequate spectral characteristics, POLDER and MERIS instruments are considered for simulations. For a moderately loaded atmosphere (i.e., aerosol optical thickness of 0.3 at 760 nm), the expected error on aerosol altitude is about 0.3 km for MERIS and 0.7 km for POLDER. More accurate estimates are obtained with MERIS, since the spectral reflectance ratio is more sensitive. Second, the methodology is applied to MERIS and POLDER imagery. Estimates of aerosol altitude are compared with lidar profiles of backscattering coefficient acquired during the AOPEX-2004 experiment. Retrievals are consistent with measurements and theory. These comparisons demonstrate the potential of the differential absorption methodology for obtaining information on aerosol vertical distribution.
机译：提出了一种从O_2吸收A波段中的反射率测量值估算气溶胶高度的方法。先前的研究表明散射体的垂直分布对反射率的影响。反射率比被定义为第一光谱带中的反射率与被O 2吸收强烈衰减的反射率与第二光谱带中的反射率最小衰减的比率。首先，进行敏感性研究以量化各种气溶胶负载和模型的预期精度。模拟中使用了一个精确的，高光谱分辨率的辐射传输模型，该模型充分考虑了散射和吸收之间的相互作用。由于具有足够的光谱特性，可以考虑使用POLDER和MERIS仪器进行仿真。对于中等负荷的大气（即760 nm处的气溶胶光学厚度为0.3），MERIS的预期气溶胶高度误差约为0.3 km，POLDER的预期误差约为0.7 km。由于光谱反射比更敏感，因此使用MERIS可以获得更准确的估计。其次，该方法适用于MERIS和POLDER影像。将气溶胶高度的估计值与在AOPEX-2004实验期间获得的反向散射系数的激光雷达轮廓进行了比较。检索与测量和理论一致。这些比较证明了差分吸收方法在获得气溶胶垂直分布信息方面的潜力。

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