Climate Change Triggers Deadly Marine Cold Waves

Climate change is not only about rising temperatures but also about the less discussed, sudden oceanic cold waves that threaten marine life. In March 2021, a significant coldwave along South Africa’s southeast coast caused the water temperature to plummet from 21°C to 11.8°C in less than 24 hours, leading to the death of over 260 marine animals from 81 different species, including manta rays and bull sharks.

Source: European Space Agency, ESA/YouTube

This phenomenon occurs when changes in wind and ocean current patterns lead to upwelling, where deep, cold water rises to the surface, replacing the warmer water. While upwelling is a common seasonal event along vast stretches of coastline worldwide, its increasing frequency and intensity pose a new threat to marine biodiversity.

Research published in Nature Climate change highlights a worrying trend: over the last 40 years, the occurrence of these upwelling events has risen, as have their severity and the extent of temperature drops during these events. This trend is ironic given that the same Climate change-driven alterations in wind and current patterns intended to disperse heat might be causing these lethal cold snaps.

The case of the bull sharks during the South Africa event illustrates the severity of the situation. Bull sharks, known for their adaptability and ability to survive in diverse environments including freshwater, were among the victims. This indicates that even highly mobile and robust marine species are vulnerable to sudden, extreme cold waves. The fact that these sharks could not escape the cold temperatures despite their mobility is alarming and underscores the lethal nature of these cold waves.

The impact of these extreme weather events extends beyond immediate mortality. The broader ecological consequences are profound, affecting food chains and marine ecosystems globally. This situation calls for urgent action to mitigate Climate change and a deeper investigation into how these anomalies affect marine life. The necessity for continued research and understanding of marine coldwaves is critical as we anticipate more frequent and severe occurrences due to ongoing climatic shifts. This highlights the complexity of Climate change impacts, revealing that the effects extend beyond warming, posing substantial challenges to marine life and ecosystems.

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