Sea Surface Acidity and Marine Waters Eutrophication

Indicators: 

• Global mean seawater surface acidity (ESS code: 14_50) | Close UN indicator: 14.3.1
• Marine waters affected by eutrophication: (ESS code: 14_60) | Close UN indicator: 14.1.1

Pilot:

North Sea: learn more

SDGs-EYES service Marine Waters Eutrophication integrates Copernicus marine model outputs, specifically ocean colour observations and biogeochemical models, to monitor chlorophyll concentrations, track eutrophication trends, and detect seasonal algal blooms. For the acidity, service Sea Surface Acidity makes use of modelled pH fields which are combined with in situ records to enhance accuracy and correct for regional biases.

These services are available through a cloud-based platform which is fully automated. Its workflow ensures seamless access to data and continuous updates of marine indicators. The services were co-designed with national statistical offices, marine scientists, and environmental agencies to ensure direct alignment with reporting structures required by the Marine Strategy Framework Directive (MSFD). The MSFD legally requires EU Member States to achieve Good Environmental Status (GES) of marine waters. This includes specific obligations to reduce eutrophication and mitigate the impacts of ocean acidification.

SDGs-EYES services Sea Surface Acidity and Marine Waters Eutrophication directly support this mandate by providing high-resolution, regularly updated indicators aligned with MSFD Descriptor 5 (Eutrophication) and Descriptor 7 (Hydrographical conditions). The services’ spatially explicit maps and trend analyses enable national and regional authorities to meet monitoring and reporting obligations under the MSFD with greater precision and timeliness.

By delivering detailed, actionable data, the services complement broader EU environmental strategies. In particular, they support the implementation of the European Climate Law by informing marine adaptation efforts and improving assessments of measures to reduce greenhouse gas emissions under initiatives like the Fit-for-55 package. Ocean acidification, monitored by the services, is directly linked to atmospheric CO2 levels. Tracking pH changes offers critical feedback on the ocean’s role in climate regulation and on progress towards climate neutrality goals.

Through these contributions, SDGs-EYES services Sea Surface Acidity and Marine Waters Eutrophication position themselves as key enablers of integrated EU marine governance, connecting SDG 14 monitoring with climate, biodiversity, and pollution-reduction policies in a coherent, operational framework. By providing cross-cutting, spatially detailed marine indicators, the services enhance Europe’s ability to deliver integrated, evidence-based ocean governance.