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New approach to the retrieval of AOD and its uncertainty from MISR observations over dark water

机译：黑水中杂散观测中检索AOD及其不确定性的新方法

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A?new method for retrieving aerosol optical depth (AOD) and its uncertainty from Multi-angle Imaging SpectroRadiometer (MISR) observations over dark water is outlined. MISR's aerosol retrieval algorithm calculates cost functions between observed and pre-simulated radiances for a?range of AODs (from 0.0 to 3.0) and a?prescribed set of aerosol mixtures. The previous version 22 (V22) operational algorithm considered only the AOD that minimized the cost function for each aerosol mixture and then used a?combination of these values to compute the final, qbest estimate/q AOD and associated uncertainty. The new approach considers the entire range of cost functions associated with each aerosol mixture. The uncertainty of the reported AOD depends on a?combination of (a) the absolute values of the cost functions for each aerosol mixture, (b) the widths of the cost function distributions as a?function of AOD, and (c) the spread of the cost function distributions among the ensemble of mixtures. A?key benefit of the new approach is that, unlike the V22 algorithm, it does not rely on empirical thresholds imposed on the cost function to determine the success or failure of a?particular mixture. Furthermore, a?new aerosol retrieval confidence index (ARCI) is established that can be used to screen high-AOD retrieval blunders caused by cloud contamination or other factors. Requiring ARCI??≥?0.15 as a?condition for retrieval success is supported through statistical analysis and outperforms the thresholds used in the V22 algorithm. The described changes to the MISR dark water algorithm will become operational in the new MISR aerosol product (V23), planned for release in 2017.
机译：a？概述了用于检索气溶胶光学深度（AOD）的新方法及其在深水上的多角度成像光谱仪（MISR）观察的其不确定性。 MISR的气溶胶检索算法计算观察和预先模拟的AODS范围（0.0至3.0）之间的成本功能（0.0到3.0）和一个α规定的气溶胶混合物。以前的版本22（V22）操作算法仅考虑了AOD，其最小化每个气溶胶混合物的成本函数，然后使用这些值的组合来计算最终最佳估计 AOD和相关的不确定性。新方法考虑与每个气溶胶混合物相关的整个成本函数范围。报告的AOD的不确定性取决于（a）每个气溶胶混合物的成本函数的绝对值，（b）成本函数分布的宽度作为aood的宽度，以及（c）扩散混合物集合中的成本函数分布。 a？新方法的主要好处是，与V22算法不同，它不依赖于对成本函数施加的经验阈值来确定特定混合物的成功或失败。此外，建立了一种新的气溶胶检索置信度指数（ARCI），可用于筛选由云污染或其他因素引起的高AOD检索空白。需要arci ??≥？0.15作为a？通过统计分析支持检索成功的条件，并且优于V22算法中使用的阈值。所描述的MISR暗水算法的变化将在新的MISR气溶胶产品（V23）中成为2017年释放的新的MISR气溶胶产品（V23）。

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