Why are scientists concerned about changing ocean colors?

A recent study by the University of Plymouth in England revealed that more than a fifth of the global ocean has darkened in the last two decades, reducing the areas of light that are vital to marine life.

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According to the BBC, this research revealed that 21% of the global ocean, equivalent to an area of ​​more than 75 million square kilometers, darkened between 2003 and 2022.

"The ocean is much more dynamic than is often believed," explained Professor Tim Smyth, Head of Marine Biogeochemistry and Observational Sciences at Plymouth Marine Laboratory.

More on ocean dimming

According to the research, the reasons for ocean darkening are believed to be due to factors such as changes in the dynamics of algal blooms, variations in sea surface temperature, and artificial lighting, according to the researchers.

"For example, we know that light levels in the water column vary greatly over a 24-hour period with the change between night and day, and animals whose behavior is directly influenced by light are much more sensitive to its processes and changes ," the study added.

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Additionally, it revealed that more than 9% of the ocean—equivalent to an area the size of Africa—experienced a reduction in light of more than 50 meters. An additional 2.6% of the ocean experienced a reduction of more than 100 meters.

According to the data, the causes of ocean darkening vary by region, the researchers say. In coastal waters, increased precipitation, agricultural runoff, and sediment loading are likely causes, while in the open ocean, changes in algal bloom dynamics and rising sea surface temperatures are reducing light penetration.

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