Ocean Turning Cyan? Microplastics Blamed for Color Shift

A significant area of the Pacific Ocean, known as the Great Pacific Garbage Patch, has been noticeably changing color over the past two decades, becoming a deeper blue-green. Researchers from the University of Bergen in Norway suspect increasing plastic pollution is the cause. They analyzed 20 years of satellite data from the region and observed a distinct brightening of blue and green light wavelengths, resulting in a cyan hue.

This phenomenon is attributed to microplastics, tiny plastic fragments that are difficult to see with the naked eye. Scientists tested how microplastics interact with light, creating "smoothies" from plastic waste. Their simulations indicated that the accumulation of microplastics could indeed alter the ocean's color to the observed cyan. This finding is significant because it could provide a method for remote sensing and quantifying microplastic pollution.

While further direct measurements are needed to definitively prove plastics are the sole cause, this satellite-based detection could be far more efficient and less costly than current methods. Scientists estimate millions of metric tons of plastic enter the ocean annually, with much of it fragmenting into hard-to-detect microplastics. If microplastics are accumulating to a level that changes the ocean's color, it highlights an alarming scale of pollution. The presence of microplastics can harm marine life, enter the food chain, carry pollutants, and affect the ocean's carbon storage capabilities.