North Sea Experiences Record-Breaking Warm Spell
The summer of 2025 is set to make history as the warmest on record for both the North Sea and the Baltic Sea, according to preliminary evaluations by the Federal Maritime and Hydrographic Agency (BSH) of Germany, led by Dr. Tim Kruschke.
If confirmed, the North Sea's average temperature would reach approximately 15.7 degrees Celsius, surpassing the records set in 2003 and 2014. The Baltic Sea, too, showed significantly elevated values, although specific temperature data was not provided in the article.
The summer heat extended to various regions of the North Sea, with exceptionally high average surface water temperatures recorded during June, July, and August. Extreme temperatures up to two degrees or more above the long-term average were measured in the western and southwestern North Sea, extending to the English Channel. The German Bight and the eastern North Sea, including areas off Denmark and Norway, were up to 1.3 degrees warmer than usual.
In the far north of the Baltic Sea, temperatures exceeded this by more than two degrees during the same period. The southwestern Baltic Sea experienced a temperature rise of up to 1.5 degrees above the long-term average (1997-2021).
Long-term data from the BSH station shows that marine heatwaves are becoming more frequent and longer in the Baltic Sea. These events, defined as temperatures remaining in the highest ten percent of values for at least five days, are becoming more common. The BSH measuring station "Lighthouse Kiel" recorded the longest marine heatwave since its beginning in 1989, lasting 55 days in spring 2025.
Kerstin Jochumsen, head of the Department of Marine Research at BSH, stated that the Baltic Sea has warmed by almost two degrees on average since 1990. This trend is concerning, as marine heatwaves can have significant impacts on marine ecosystems and biodiversity.
The summer of 2025 followed the warmest spring, another sign of advancing climate change. However, the article does not provide information on the causes or potential effects of these high temperatures and marine heatwaves in the Baltic Sea and the North Sea.
As we continue to monitor these developments, it's clear that the changing climate is having a profound impact on our oceans. The record-breaking temperatures in the North Sea and Baltic Sea in 2025 serve as a stark reminder of the urgent need for action to mitigate climate change and protect our planet's precious marine resources.
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