Monday 10 March 2025
The Benguela Upwelling System, off the coast of Namibia, is one of the four major eastern boundary upwelling ecosystems in the oceans. It’s a vital area for marine life, but it’s also been largely overlooked when it comes to studying environmental radioactivity. That’s why a team of researchers has embarked on a mission to map out the presence of two key radionuclides – uranium-236 and neptunium-237 – in this unique ecosystem.
The Benguela Upwelling System is characterized by a complex mix of ocean currents, which bring nutrient-rich water from the depths to the surface. This creates an ideal environment for phytoplankton to thrive, supporting a diverse array of marine life. However, it also makes it difficult to predict how radionuclides will behave in this system.
The researchers used a technique called accelerator mass spectrometry (AMS) to measure the levels of uranium-236 and neptunium-237 in seawater samples collected from the surface to a depth of 1250 meters. They also analyzed the oxygen levels and salinity of each sample to identify different water masses, including Antarctic Intermediate Water and North Atlantic Deep Water.
Their findings reveal that both radionuclides are present throughout the system, with higher concentrations found in shallower waters near the coast. This is likely due to the input of radioactive materials from human activities, such as nuclear power plants and weapons testing.
The researchers also found that the levels of uranium-236 and neptunium-237 varied depending on the distance from the coastline. Inshore stations, which were closer to the coast, had lower concentrations of both radionuclides compared to offshore stations. This could be due to a variety of factors, including differences in water circulation patterns and the presence of marine life that helps to remove radioactive materials from the water.
The study’s results have important implications for our understanding of how radionuclides behave in upwelling ecosystems like the Benguela. It also highlights the need for continued monitoring of these systems to better understand the impact of human activities on the environment.
In addition, the findings could have practical applications in fields such as fisheries management and marine conservation. By understanding how radionuclides move through the ecosystem, scientists can develop more effective strategies for protecting marine life and ecosystems from pollution.
Cite this article: “Uncovering Radionuclide Presence in the Benguela Upwelling System”, The Science Archive, 2025.
Benguela Upwelling System, Radioactivity, Uranium-236, Neptunium-237, Radionuclides, Ocean Currents, Phytoplankton, Marine Life, Fisheries Management, Marine Conservation
