Global warming not only affects the climate on land – it also changes conditions in the ocean. Marine heatwaves and the spread of toxic algae can have major consequences for nature, aquaculture operators and local communities that depend on the sea for their livelihood. At the Nansen Center, we are working to understand and predict these complex processes. We are developing methods and tools that will provide us with the knowledge we need to tackle climate challenges.
Marine heatwaves are unusually warm periods in the ocean that last from days to months, often defined as temperatures above a seasonal “normal level”. Unlike heat waves in the air (atmospheric heat waves) that directly affect us humans where we live, marine heat waves occur in the ocean – on the surface and down into the depths. They often last longer and spread over large areas because the ocean stores and moves heat differently than air. Marine heatwaves can lead to the destruction of coral reefs, loss of kelp forests and other key habitats. Heatwaves also affect fish stock migration, reproduction, survival, and other ecosystem disturbances. This in turn has economic consequences for fisheries, aquaculture, and coastal communities.
Harmful algal blooms (HAB): Certain microscopic algae produce toxins that are harmful to other marine life or to humans who eat seafood. The growth of harmful algae is influenced by water temperature and sunlight, and the toxin concentration is highest in shellfish that filter water and accumulate toxins. It has been necessary to develop better methods for forecasting dangerously high levels of toxic algae.
At the Nansen Center, we are committed to forward-looking research and innovation that will improve the forecasting system for conditions in the sea and along the coast, and facilitate smart, knowledge-based adaptations.
Read more about these topics in the opinion piece and in the news article below:
