Over 20% of the world’s oceans are becoming darker, and scientists warn that this could have significant repercussions for marine habitats and human beings. A recent investigation by the University of Plymouth reveals that 21% of the planet’s oceans have witnessed a decrease in sunlight penetration from 2003 to 2022.
This phenomenon, referred to as ocean darkening, occurs when the surface layers of the ocean limit how deep sunlight can reach. The research indicates that in certain areas, light penetration has diminished by more than 100 meters. Over 9% of the ocean experienced a decline of at least 50 meters, covering an area approximately the size of Africa.
Various factors may be contributing to this trend. Alterations in algal bloom behavior, escalating sea surface temperatures, and heightened artificial lighting are among the potential culprits. These changes, many associated with climate change, affect the way light travels through the water.
Diminished lighting in the oceans could also disrupt life beneath the surface. Numerous marine organisms rely on light cues for hunting, migration, and reproduction. As illumination decreases, these natural cycles are disrupted. Dr. Thomas Davies, a researcher involved in the study, indicated that darkening could reduce the regions where light-dependent species can live and flourish.
In addition to marine organisms, this trend may also impact humans. Ocean darkening could affect oxygen generation, carbon absorption, and global climate dynamics. It may additionally force light-sensitive species towards the surface, where they encounter heightened competition for sustenance and other necessities.
The researchers emphasize that such alterations could lead to fundamental changes in the functionality of marine ecosystems. With many of the ocean’s services, such as fisheries and climate management, endangered, the results highlight the necessity for increased scrutiny of the developments occurring beneath the surface. Nevertheless, some question whether there is anything we can do to combat climate change, especially as we seem to be losing the battle.
