An anonymous reader quotes a report from Scientific American: The Great Pacific Garbage Patch, an area in the Pacific Ocean where debris naturally accumulates, is full of tiny bits of plastic -- so full, in fact, that it seems to be changing the color of the ocean. [...] To better understand how microplastics may have influenced the ocean's color, [Daniel Koestner, a postdoctoral fellow at the University of Bergen in Norway] and his colleagues looked at 20 years of satellite data from the spot in the ocean with perhaps the most of plastic -- the Great Pacific Garbage Patch, a zone between Hawaii and California where trash trapped by ocean currents accumulates. Between 2002 and 2022, the researchers found, waters near the garbage patch have gotten brighter in both blue and green wavelengths compared with surrounding areas. The results, published in the journal Communications Earth & Environment on Thursday, don't yet prove that microplastics have directly brightened the ocean, the researchers emphasize, though their findings are backed up by lab experiments with microplastics. But without taking direct ocean samples, it's hard to know for sure what's causing the ocean's color to change. "We're still one step away from proving definitively that microplastics are causing the shift in color that that we're seeing," adds study co-author Shea Cheatham, a Ph.D. student also at the University of Bergen. "We just have to get in there [to the garbage patch] to verify." The hope is that detecting these color shifts could help identify other areas around the world where microplastics have accumulated.

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