卫星数据揭示了世界上最大的湖泊的长期变化
1Estonian Marine Institute, University of Tartu, Mäealuse 14, 12618, Tallinn, Estonia. Tiit.Kutser@ut.ee.
Scientific reports
|June 22, 2024
概括
大型湖泊生态系统正在发生变化. 来自ESAOC-CCI的卫星数据显示了从1997年到2023年间植物浮游生物质,颗粒物和溶解有机物中的各种趋势,突出显示了需要持续监测的必要性.
科学领域:
- 环境科学 环境科学
- 遥感 遥感 遥感 遥感
- 临界技术 临界技术
背景情况:
- 湖泊是重要的淡水资源,是全球生态和碳循环的组成部分.
- 了解长期的湖泊生态系统变化对于有效的管理和保护至关重要.
- 欧洲航天局的海洋色气候变化倡议 (OC-CCI) 数据库为研究大型湖泊提供了有价值的长期卫星数据.
研究的目的:
- 用卫星数据分析世界上最大的湖泊中关键水质参数的时间变化.
- 调查植物浮游生物质 (Chl-a),颗粒物 (bbp555),有色溶解有机物 (CDOM) 和光衰减 (Kd490) 的趋势.
- 评估遥感数据对监测大湖生态系统动态的有用性.
主要方法:
- 使用了ESA OC-CCI数据库,涵盖了1997-2023年期间.
- 分析了全球里海和10个其他主要湖泊的卫星数据.
- 甲基的量化趋势,颗粒物反向散射,CDOM吸收和扩散衰减系数.
主要成果:
- 在研究的湖泊中,对所有分析的参数观察到不同的趋势 (增加,减少或稳定).
- 在一些劳伦斯大湖中发现了有色溶解有机物变化和湖水水平之间的相关性.
- 在密歇根湖和休伦湖的植物浮游生物质和颗粒物中发现了不同的趋势,这表明2005年左右可能会发生社区转变.
结论:
- 远程传感产品,如ESA OC-CCI,是长期监测大型湖泊生态系统的有效工具.
- 湖泊生态系统对环境变化表现出复杂而多样的反应,需要持续的基于卫星的观测.
- 该研究强调了长期数据对于检测生态变化的重要性,并为水资源管理提供信息.
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