A new study published in Global Change Biology reveals that over 21% of the world's oceans have darkened since 2003, indicating a significant decline in the photic zones crucial for marine ecosystems. Researchers from the University of Plymouth and University of Exeter used NASA satellite data to analyze the depth changes of these zones, finding areas where photic zone depths decreased by over 328 feet. This trend threatens marine species reliant on sunlight and illustrates the urgent need for awareness about ocean health amidst climate change challenges.
According to our findings, 21 percent of the ocean has darkened over the last twenty years, shrinking the crucial photic zones where most marine life resides.
Davies noted that this reduction in photic zones 'reduces the amount of ocean available for animals that rely on the Sun and the Moon for their survival and reproduction.'
Our research utilizes two decades of NASA satellite data, uncovering significant declines in the depth of light penetration across the world's oceans.
Importantly, our study highlights areas where photic zone depth has decreased drastically—some regions have retreated by over 328 feet, severely impacting marine ecosystems.
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