高吸收性沿海水域的光学封闭:不弹性散射过程的意义
Optics express
|October 20, 2023
概括
在沿海水域实现光学封闭是具有挑战性的. 包括来自溶解有机物和叶绿素的太阳引起的光,显著提高了遥感反射率的模型准确性.
科学领域:
- 水文光学是指水文光学.
- 海洋遥感 海洋遥感
- 生物地质化学光学学
背景情况:
- 光学封闭确保了放射测量和辐射转移模型之间的一致性.
- 具有高吸收性的沿海水域,富含色素溶解有机物 (CDOM),由于信号噪声比低和IOP测量不确定性,对光学封闭提出了挑战.
- 准确的固有光学特性 (IOP) 和边界条件对于可靠的辐射转移建模至关重要.
研究的目的:
- 评估CDOM主导的高度吸收的沿海水域的光学封闭.
- 评估不弹性散射过程,特别是太阳诱导的CDOM光 (fDOM) 和叶绿素光 (SICF) 对光学封闭的影响.
- 确定fDOM和SICF对这些光学复杂水域的遥感反射率 (Rrs) 的贡献.
主要方法:
- 在CDOM丰富的沿海水域收集现场IOP (吸收和反向散射).
- 使用HydroLight模拟光谱遥感反射率 (Rrs),并测量IOP和边界条件.
- 将建模的Rrs与在现场的Rrs进行了比较,这些Rrs来自于C-OPS (紧光学造型系统) 的放射测量.
- 将无弹性散射过程 (fDOM和SICF) 纳入辐射转移模型中.
主要成果:
- 包括不弹性散射过程在内,显著改善了光学封闭,增强了测量和建模Rrs之间的一致性 (R2从0.90到0.96,斜率从0.64到0.90).
- 太阳引起的CDOM光 (fDOM) 在绿色波长中对Rrs贡献了约18%.
- 阳光诱导的叶绿素光 (SICF) 在红色波长中约占Rrs的20%.
结论:
- 考虑到不弹性散射,特别是fDOM,对于CDOM主导的沿海水域的精确光学封闭至关重要.
- fDOM和SICF在光谱Rrs中发挥着重要作用,特别是在绿色和红色区域.
- 这项研究强调了将光纳入光学复杂沿海环境的遥感应用中的重要性.
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