Why Is the Water in the Gulf of Riga Becoming Browner?
Changes in water colour and transparency are being observed in the Gulf of Riga and elsewhere in the Baltic Sea. Researchers are working to understand what is driving these long-term changes and what they may mean for marine ecosystems.
The topic was recently discussed by Solvita Strāķe, Leading Researcher at the Latvian Institute of Aquatic Ecology (LHEI), in the Latvian Radio programme Zināmais nezināmajā, with the main findings also featured on LSM.lv.
LHEI researchers are studying these changes within the Horizon Europe AquaINFRA project, which aims to improve access to marine and freshwater data and make it easier for researchers across Europe to combine and reuse information from different sources.
One of the processes being investigated is brownification – an increase in coloured dissolved organic matter entering aquatic environments. Such changes may affect how much light penetrates the water and, consequently, influence marine habitats and ecosystem processes.
Long-term observations are particularly important for understanding whether these changes are temporary or part of a broader trend. By combining historical monitoring data with information from other parts of the Baltic Sea, researchers can better assess how environmental conditions in the Gulf of Riga are changing.
The work also demonstrates the importance of accessible and interoperable environmental data for understanding complex processes in the Baltic Sea and supporting future research and modelling.
Read and listen to the Latvian Radio feature on LSM.lv (in Latvian):
https://www.lsm.lv/raksts/dzive-stils/tehnologijas-un-zinatne/25.08.2026-vairaku-valstu-petnieki-censas-saprast-kadel-baltijas-juras-udens-klust-brunaks.a660223/
More about the AquaINFRA project:
https://aquainfra.eu/
