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Globally consistent assessment of coastal eutrophication
Elígio de Raús Maúre1, Genki Terauchi2, Joji Ishizaka3
1Department of Research and Study, Northwest Pacific Region Environmental Cooperation Center, Toyama, Japan. eligiomaure@gmail.com.
Nature Communications
|October 23, 2021
Summary
Eutrophication is a growing global problem. A new tool maps coastal eutrophication potential worldwide using satellite data, revealing widespread affected areas and aiding Sustainable Development Goals monitoring.
Area of Science:
- Environmental Science
- Oceanography
- Remote Sensing
Background:
- Eutrophication, driven by nutrient pollution, is a significant global environmental issue.
- Assessing eutrophication extent is challenging due to limited monitoring programs.
- Coastal ecosystems are particularly vulnerable to nutrient enrichment.
Purpose of the Study:
- To introduce the first global, interactive assessment tool for coastal eutrophication potential (CEP).
- To map global CEP using satellite-derived chlorophyll-a trends.
- To support monitoring of Sustainable Development Goals (SDGs).
Main Methods:
- Utilized Google Earth Engine for a global-scale analysis.
- Analyzed satellite-derived chlorophyll-a (CHL) trends.
- Developed an interactive tool to visualize and assess CEP.
Main Results:
- Identified approximately 1.15 million km² of coastal waters (depth ≤200 m) as having eutrophic potential.
- Waters with increasing CHL trends (eutrophication potential) are twice as prevalent as those showing recovery.
- The tool successfully identified known eutrophic areas and highlighted data-scarce regions.
Conclusions:
- The developed tool provides a consistent global assessment of eutrophication trends.
- This offers significant implications for monitoring SDGs, particularly SDG 14 (Life Below Water).
- Highlights the critical role of Earth Observations in environmental management and SDG achievement.
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