从太空中估计水下光衰减 - - 对于案例2的海洋水域采用光谱方法
Andreas Holbach1, Sanjina Upadhyay Stæhr1, Peter Anton Upadhyay Stæhr1
1Institute of Ecoscience, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark.
The Science of the total environment
|June 1, 2025
概括
一个新的光谱模型准确地估计了复杂的海水中的水清晰度 (KdPAR),其性能优于现有的卫星方法. 这有助于加强海洋生态系统的监测,并支持环境指令.
科学领域:
- 海洋光学 海洋光学
- 遥感 遥感 遥感 遥感
- 欧洲化研究研究 欧洲化研究
背景情况:
- 水的清晰度对海洋健康至关重要,它表明了环氧化水平.
- 在现场测量光衰减 (Kd) 是至关重要的,但有限.
- 卫星估计与光学上复杂的 (案例2) 水域作斗争.
研究的目的:
- 开发和验证一种新的光谱模型来估计水的清晰度 (KdPAR).
- 改善基于卫星的海水清晰度监测.
- 将模型性能与现场数据和更简单的卫星方法进行比较.
主要方法:
- 对光合作用活性辐射 (400-700 nm) 的分散光衰减系数 (KdPAR) 的实证光谱建模.
- 使用丹麦海域 (2018-2023) 进行广泛的现场测量验证.
- 用两个非光谱卫星方法进行比较分析.
主要成果:
- 在模拟和现场KdPAR (R=0.63) 之间有很强的一致性.
- 这种新型号的性能优于现有的非光谱卫星方法.
- 在案例2的水域中有效捕捉空间和时间的变化.
结论:
- 运营卫星衍生的固有光学特性 (IOP) 产品为水的清晰度提供了强大的代理.
- 这种方法补充了有限的现场数据,增强了环境监测.
- 支持欧盟水资源框架和海洋战略框架指令,以改善数据覆盖范围.
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