Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate
An effective satellite observation system is developed to retrieve the diatom concentration in freshwater ecosystems that could be utilized for understanding aquatic biogeochemical cycles. Although the singular value decomposition-based retrieval model can reflect the complicated diatom dynamics, th...
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MDPI AG
2025-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/17/2/309 |
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| author | Menglan Gan Lei Feng Jingan Shao Li Feng Yao Wang Meiling Liu Ling Wu Botian Zhou |
| author_facet | Menglan Gan Lei Feng Jingan Shao Li Feng Yao Wang Meiling Liu Ling Wu Botian Zhou |
| author_sort | Menglan Gan |
| collection | DOAJ |
| description | An effective satellite observation system is developed to retrieve the diatom concentration in freshwater ecosystems that could be utilized for understanding aquatic biogeochemical cycles. Although the singular value decomposition-based retrieval model can reflect the complicated diatom dynamics, the spatial distribution and temporal trend in diatom concentration on a large scale, as well as its driving mechanism, remain prevalently elusive. Based on the Google Earth Engine platform, this study uses Sentinel-2 MultiSpectral Instrument imagery to track the comprehensive diatom dynamics in a large reservoir, i.e., the Three Gorges Reservoir, in China during the years 2019–2023. The results indicate that a synchronous diatom distribution is found between the upstream and downstream artificial lakes along the primary tributary in the Three Gorges Reservoir, and the causal relationships between the declining diatom trend and hydrological/meteorological drivers on the monthly and yearly scales are highlighted. Moreover, the Sentinel-derived diatom concentration can be used to ascertain whether the dominant algae are harmful during bloom periods and aid in distinguishing algal blooms from ship oil spills. This study is a significant step forward in tracking the diatom dynamics in a large-scale freshwater ecosystem involving complex coupling drivers. |
| format | Article |
| id | doaj-art-b23834cad8c54aa396adbfdeb3231df2 |
| institution | Kabale University |
| issn | 2072-4292 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-b23834cad8c54aa396adbfdeb3231df22025-01-24T13:48:05ZengMDPI AGRemote Sensing2072-42922025-01-0117230910.3390/rs17020309Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local ClimateMenglan Gan0Lei Feng1Jingan Shao2Li Feng3Yao Wang4Meiling Liu5Ling Wu6Botian Zhou7School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, ChinaChongqing Key Laboratory of Big Data and Intelligent Computing, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, ChinaSchool of Geography and Tourism, Chongqing Normal University, Chongqing 401331, ChinaChongqing Collaborative Innovation Center of Big Data Application in Eco-Environmental Remote Sensing, Chongqing Academy of Ecological and Environmental Science, Chongqing 401147, ChinaSchool of Geography and Tourism, Chongqing Normal University, Chongqing 401331, ChinaSchool of Information Engineering, China University of Geosciences, Beijing 100083, ChinaSchool of Information Engineering, China University of Geosciences, Beijing 100083, ChinaChongqing Key Laboratory of Big Data and Intelligent Computing, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, ChinaAn effective satellite observation system is developed to retrieve the diatom concentration in freshwater ecosystems that could be utilized for understanding aquatic biogeochemical cycles. Although the singular value decomposition-based retrieval model can reflect the complicated diatom dynamics, the spatial distribution and temporal trend in diatom concentration on a large scale, as well as its driving mechanism, remain prevalently elusive. Based on the Google Earth Engine platform, this study uses Sentinel-2 MultiSpectral Instrument imagery to track the comprehensive diatom dynamics in a large reservoir, i.e., the Three Gorges Reservoir, in China during the years 2019–2023. The results indicate that a synchronous diatom distribution is found between the upstream and downstream artificial lakes along the primary tributary in the Three Gorges Reservoir, and the causal relationships between the declining diatom trend and hydrological/meteorological drivers on the monthly and yearly scales are highlighted. Moreover, the Sentinel-derived diatom concentration can be used to ascertain whether the dominant algae are harmful during bloom periods and aid in distinguishing algal blooms from ship oil spills. This study is a significant step forward in tracking the diatom dynamics in a large-scale freshwater ecosystem involving complex coupling drivers.https://www.mdpi.com/2072-4292/17/2/309diatom concentrationSentinel-2 multispectral instrumentsingular value decompositionThree Gorges ReservoirGoogle Earth Engine |
| spellingShingle | Menglan Gan Lei Feng Jingan Shao Li Feng Yao Wang Meiling Liu Ling Wu Botian Zhou Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate Remote Sensing diatom concentration Sentinel-2 multispectral instrument singular value decomposition Three Gorges Reservoir Google Earth Engine |
| title | Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate |
| title_full | Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate |
| title_fullStr | Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate |
| title_full_unstemmed | Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate |
| title_short | Satellite Observations Reveal Declining Diatom Concentrations in the Three Gorges Reservoir: The Impacts of Dam Construction and Local Climate |
| title_sort | satellite observations reveal declining diatom concentrations in the three gorges reservoir the impacts of dam construction and local climate |
| topic | diatom concentration Sentinel-2 multispectral instrument singular value decomposition Three Gorges Reservoir Google Earth Engine |
| url | https://www.mdpi.com/2072-4292/17/2/309 |
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