卫星观测显示,中国沿海水域的水清度最近有所提高
Youlv Wu1,2,3, Lian Feng3, Shangbo Yang4
1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Environmental science & technology
|September 16, 2025
概括
中国的沿海水域正在变得越来越清,其中大多数水域从以前的下降中恢复过来. 总悬浮物质是这些水的清晰度变化的主要驱动因素,特别是在海岸附近.
科学领域:
- 沿海生态 沿海生态
- 遥感 遥感 遥感 遥感
- 海洋光学 海洋光学
背景情况:
- 中国的沿海生态系统面临着气候变化和人类活动带来的重大变化.
- 这些地区水的清晰度的长期趋势和驱动因素尚不清楚.
研究的目的:
- 分析长期水的清晰度动态,并确定中国沿海水域的关键驱动因素.
- 通过使用卫星观测,生成光学活性成分 (OAC) 的高质量数据产品.
主要方法:
- 利用2003-2022年间的MODIS卫星观测数据来得出Secchi深度 (Zsd) 和OACs (TSM,CDOM,Chl-a) 的数据.
- 分析了水清晰度和OAC度的空间和时间模式.
- 量化了不同OAC对Secchi深度变化的影响.
主要成果:
- 77.4%的中国沿海水域显示水的清度增加,22.7%显示持续改善,54.7%显示在初始下降后恢复.
- 总悬浮物质 (TSM) 是Secchi深度 (Zsd) 变化的主要驱动因素,解释了总体约60%和近岸地区高达80%的变化.
- 彩色溶解有机物 (CDOM) 在离岸水域对Zsd的影响更大.
结论:
- 中国的沿海水的清性普遍有所改善,通常是通过非线性回收过程.
- 太阳能系统是影响水的清晰度的主要因素,特别是在近海环境中.
- 了解非线性变化和特定成分驱动因素对于在环境变化中有效地管理沿海水质量至关重要.
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