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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >RETRIEVAL OF ATMOSPHERIC PROPERTIES AND SURFACE BIDIRECTIONAL REFLECTANCES OVER LAND FROM POLDER/ADEOS
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RETRIEVAL OF ATMOSPHERIC PROPERTIES AND SURFACE BIDIRECTIONAL REFLECTANCES OVER LAND FROM POLDER/ADEOS

机译：从POL田/ ADEOS反演陆地上的大气性质和表面对向反射

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Polarization and Directionality of the Earth's Reflectances (POLDER) is a new instrument devoted to the global observation of the polarization and directionality of solar radiation reflected by the Earth-atmosphere system It will fly onboard the ADEOS platform in 1996. This paper outlines the improvements expected from POLDER in the description of atmospheric aerosols and water vapor over land, and of surface bidirectional reflectances. It then gives a detailed description of the operational algorithms which are implemented in the ''land surface and atmosphere over land'' processing line. This line is part of an effort initiated by Centre National d'Etudes Spatiales (the French Space Agency) to develop lines of products in order to facilitate the exploration of POLDER's new capabilities by the international science community. Emphasis is given in this paper to the presentation of the principles, physical rationale, and elements of validation of the algorithms of this processing line. The main products are (1) for each orbit segment, the amount and type of aerosols, the water vapor content, and bidirectional reflectances corrected for atmospheric effects, and (2) every 10 days, global maps of surface directional signatures, of hemispherical surface reflectances, and of parameters describing the statistical distribution of aerosol and water vapor content. These products will be made available to all interested investigators. The most innovative algorithms of the processing line are (1) cloud detection, based on a series of tests involving reflectance thresholds, oxygen pressure estimates, and analysis of polarized radiance in the rainbow direction, (2) retrieval of aerosol optical thickness and type from directional polarized radiance measurements, and (3) retrieval of surface directional signature through an adjustment of a time series of directional reflectance measurements with a semiempirical bidirectional reflectance model. [References: 79]
机译：地球反射的偏振和方向性（POLDER）是一种新仪器，专门用于全球观测地球大气系统反射的太阳辐射的偏振和方向性。它将于1996年在ADEOS平台上飞行。本文概述了预期的改进POLDER在描述陆地上的大气气溶胶和水蒸气以及表面双向反射率方面的研究。然后，它详细描述了在“陆地表面和陆地上的大气”处理线上实施的运算算法。这条生产线是国家太空研究中心（法国航天局）发起的，旨在开发产品线以促进国际科学界探索POLDER新功能的工作的一部分。本文重点介绍了该处理线算法的原理，物理原理和验证元素。主要产品是（1）每个轨道节段，气溶胶的数量和类型，水汽含量以及针对大气影响校正的双向反射率，以及（2）每10天提供半球表面的表面方向性标记的全局图反射率，以及描述气溶胶和水蒸气含量统计分布的参数。这些产品将提供给所有感兴趣的研究人员。该生产线中最具创新性的算法是（1）基于一系列测试的云检测，包括反射率阈值，氧气压力估计值和彩虹方向的偏振辐射分析，（2）从中检索气溶胶光学厚度和类型方向偏振辐射测量，以及（3）通过使用半经验双向反射模型调整方向反射率测量的时间序列来检索表面方向特征。 [参考：79]

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