Since the end of May 2025, Albufera Lagoon has been undergoing a brownification event, a phenomenon characterized by a noticeable darkening of surface waters. This change, clearly captured by recent Sentinel-2 satellite imagery, shows elevated NDVI (Normalized Difference Vegetation Index) values, which are closely linked to increased chlorophyll concentrations in surface waters. The timing of this event aligns with a period of rising temperatures and prolonged lack of precipitation, raising concerns among environmental scientists and local stakeholders.
Leveraging ESA’s Copernicus Sentinel-2 data, the OurMED team has been actively monitoring the lagoon. Through the integration of remote sensing, SmartAG tools, and MRV (Monitoring, Reporting, and Verification) technologies, the team has identified significant changes in surface water turbidity and indications of intensified biological activity. Preliminary NDVI analysis points to increased turbidity and chlorophyll content, both critical indicators of water quality deterioration.
This is not the first time Albufera has experienced such stress. A similar brownification linked to elevated chlorophyll was recorded in October 2023, an event detected during the early phase of the OurMED project (2023–2026), also detected via the SmartAG satellite platform. The recurrence of these events underscores the lagoon’s vulnerability to climate variability and land-use changes, emphasizing the need for continuous monitoring and proactive ecosystem management.
Why it matters: Brownification affects not only aquatic life but also irrigation, biodiversity, and local livelihoods dependent on the lagoon.
The OurMED project continues to provide real-time, scalable insights for stakeholders—from farmers to regional authorities, fostering a proactive, data-driven response to protect this vital Albufera Lagoon ecosystem.
Stay tuned for more updates as we deepen our analysis and work towards a sustainable management plan for Albufera Lagoon.
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Figure 1. Minimum, mean, and maximum temperatures, along with total precipitation, recorded in the Albufera Lagoon region, Valencia (Spain). |
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Figure 2. Temporal Distribution of NDVI Values from January to June 2025 |
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Figure 3. NDVI Variation: April–July 2025 |
