Earth’s oceans mysteriously getting darker, scientists are stunned

Over 9% of the ocean, an area roughly the size of Africa, has seen photic zone depths decrease by more than 50 meters. In 2.6% of the ocean, the reduction exceeds 100 meters.

While about 10% of the ocean has become lighter, the overall trend is towards darkening, raising concerns for marine species that depend on light for survival, reproduction, and feeding.

“Our results provide evidence that such changes cause widespread darkening that reduces the amount of ocean available for animals that rely on the sun and the moon for their survival and reproduction,” said Dr. Thomas Davies, Associate Professor of Marine Conservation at the University of Plymouth.

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Causes and Consequences

Researchers attribute coastal darkening primarily to increased nutrient and sediment runoff from agriculture and rainfall, which stimulate plankton growth and reduce light penetration.

In the open ocean, shifts in algal bloom dynamics and rising sea surface temperatures are likely culprits.

The implications are far-reaching. As photic zones shrink, light-dependent organisms are forced closer to the surface, increasing competition for food and resources.

NOTE – This article was originally published in indiatoday and can be viewed here