Atmospheric correction of ocean color imagery in the Earth Observing System era
Atmospheric correction of ocean color imagery in the Earth Observing System era
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DOI：
10.1029/96jd02443
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发表时间：
1997-07-27
影响因子：
4.4
通讯作者：
Gordon, HR
中科院分区：
文献类型：
--
作者：
Gordon, HR
在NASA的地球观测系统时代（SeaWiFS、MODIS和MISR），可用于观测海洋颜色的传感器的辐射灵敏度是概念验证海洋颜色仪器CZCS（海岸带颜色扫描仪）的2-4倍。为了实现在生物学上重要的海洋参数的检索方面的改进，光合色素叶绿素a的浓度，从这个增加的灵敏度，需要比应用于CZCS显著更好的大气校正。大气校正的改进需要包括多次散射的影响，这是强烈依赖于气溶胶的尺寸分布，浓度和吸收特性。我们回顾了海洋大气校正的基本概念，并提供了目前正在开发的SeaWiFS，MODIS和MISR的算法的细节。一种替代的校正算法，可能是在沿海地区的显着价值的MISR描述。相关的问题，如对流层中的气溶胶垂直结构的影响，光场的偏振，海面粗糙度，和海洋白浪在海面上进行评估，并计划将其列入算法进行说明。尚未解决的问题，如平流层气溶胶的存在、用于评估多重散射的气溶胶模型的适当性，以及确定吸收性气溶胶的存在及其校正方面的困难，例如，城市污染或矿物粉尘，确定，并提出建议，为他们的解决方案。
Sensors that can be used for the observation of ocean color in NASA's Earth Observing System era (SeaWiFS, MODIS, and MISR) have been designed with 2-4 times the radiometric sensitivity of the proof-of-concept ocean color instrument CZCS (coastal zone color scanner). To realize an improvement in the retrieval of biologically important ocean parameters, e.g., the concentration of the photosynthetic pigment chlorophyll a, from this increased sensitivity, significantly better atmospheric correction than was applied to CZCS is required. Atmospheric correction improvement necessitates the inclusion of the effects of multiple scattering, which are strongly dependent on the aerosol size distribution, concentration, and absorption properties. We review the basic concepts of atmospheric correction over the oceans and provide the details of the algorithms currently being developed for SeaWiFS, MODIS, and MISR. An alternate correction algorithm that could be of significant value in the coastal zone is described for MISR. Related issues such as the influence of aerosol vertical structure in the troposphere, polarization of the light field, sea surface roughness, and oceanic whitecaps on the sea surface are evaluated and plans for their inclusion in the algorithm are described. Unresolved issues, such as the presence of stratospheric aerosol, the appropriateness of the aerosol models used in the assessment of multiple scattering, and the identification of, and difficulties associated with the correction for, the presence of absorbing aerosols, e.g., urban pollution or mineral dust, are identified, and suggestions are provided for their resolution.