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首页> 外文会议>Proceedings of the Second Working Meeting on MERIS and AATSR Calibration and Geophysical Validation (MAVT-2006) >STUDY OF THE MERIS AEROSOL OPTICAL THICKNESS RETRIEVAL AND SENSITIVITY TO NEAR INFRARED REFLECTANCES
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STUDY OF THE MERIS AEROSOL OPTICAL THICKNESS RETRIEVAL AND SENSITIVITY TO NEAR INFRARED REFLECTANCES

机译：梅里斯气溶胶光学厚度反演和近红外反射敏感性的研究

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摘要

This work is a part of a global revision effort of the MERIS Atmospheric Correction, aiming at reducing recently observed errors in the reflectances of waterleaving radiances. It focuses mainly on the aerosol optical thickness computation, which is one step of the correction. Error estimates at three sites characterized by case 1 waters are first presented, to illustrate the discrepancies between the reflectances measured in situ and those retrieved by the MERIS ground segment algorithm. The algorithm is summarized, emphasizing the role and the weaknesses of the look-up tables involved in the optical thickness retrieval and in the water-leaving reflectances computation. The link between both quantities is made explicit through the analysis of the algorithm as well as by a case study. The sensitivity of the current methodology to near infrared reflectances is assessed, which brings questions about the pre-correction for residual gaseous absorption and the generation of look-up tables.
机译：这项工作是MERIS大气校正全球修订工作的一部分，目的是减少最近观测到的留水辐射反射率的误差。它主要关注气溶胶光学厚度的计算，这是校正的第一步。首先介绍了以情况1水为特征的三个地点的误差估计，以说明现场测量的反射率与MERIS地面分段算法获得的反射率之间的差异。对该算法进行了总结，强调了查找表在光学厚度检索和水反射率计算中的作用和缺点。通过对算法的分析以及案例研究，可以明确两个量之间的联系。评估了当前方法对近红外反射率的敏感性，这带来了有关残留气体吸收的预校正和查找表生成的问题。

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