Correction of Sun glint Contamination on the SeaWiFS Ocean and Atmosphere Products.
Correction of Sun glint Contamination on the SeaWiFS Ocean and Atmosphere Products.
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DOI：
10.1364/ao.40.004790
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发表时间：
2001-09
期刊：
影响因子：
1.9
通讯作者：
M. Wang;S. Bailey
中科院分区：
文献类型：
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作者：
M. Wang;S. Bailey
对于海洋和大气光学特性的遥感，必须避免和/或屏蔽受太阳闪烁影响的辐射测量。在被太阳闪烁严重污染的地区，通常没有有意义的反演。海景宽视场传感器（SeaWiFS）能够将传感器从最低点倾斜20度，以最大限度地减少太阳闪烁污染。根据考克斯和蒙克模型[J. Opt. Soc. Am. 44，838 - 850（1954）]并应用于SeaWiFS数据。然而，太阳闪烁仍然是日下点附近的一个因素。我们目前的结果表明，海洋生物光学和大气产品的检索上的太阳闪烁污染的影响。我们表明，虽然太阳闪烁污染对检索的海洋颜色产品的影响很小，但对检索的大气产品的影响，例如，气溶胶光学厚度是重要的。我们描述了一个太阳闪烁校正方案中实施的SeaWiFS数据处理系统和比较的结果与没有太阳闪烁校正。经过太阳闪烁校正后，得到的海洋和大气产品得到了改进。此外，可以减少太阳闪烁遮蔽区域，因此可以显著增加日下点附近的覆盖区域。
For remote sensing of the ocean and atmosphere optical properties, the measurement of radiances affected by sun glint has to be avoided and/or masked out. There are usually no meaningful retrievals in regions significantly contaminated by sun glint. The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) is capable of operationally tilting the sensor 20 degrees away from nadir to minimize sun glint contamination. The sun glint mask is computed from the Cox and Munk model [J. Opt. Soc. Am. 44, 838-850 (1954)] and applied to the SeaWiFS data. However, sun glint is still a factor near the subsolar point. We present results that demonstrate the effect of sun glint contamination on retrievals of ocean bio-optical and atmospheric products. We show that, although sun glint contamination has a minor effect on retrieved ocean color products, the effect on retrieved atmospheric products, e.g., aerosol optical thickness, is significant. We describe a sun glint correction scheme implemented in the SeaWiFS data-processing system and compare the results with and without sun glint correction. With sun glint correction the derived ocean and atmospheric products are improved. Also, the sun glint masked area can be reduced and therefore can increase significantly the coverage area near the subsolar point.