New mathematical model predicts the movement of microplastics in the ocean

Researchers from Newcastle University have identified for the first time the processes that underlie movement.

microplastics in the ocean.They found that the particle properties that influence its vertical movement are the current and the algae population, which determine the maximum depth reached. The study results also show that the smallest particles are extremely sensitive to attachment and growth. This suggests that they are always submerged to a depth surrounding the base of the euphotic zone - the layer located closer to the surface.

In this case, microplastic (fragments with a diameter less than5mm) makes up 90% of the plastic debris found on the ocean's surface, but there is much more plastic in the ocean than on its surface. Researchers cannot say with certainty what exactly is happening to the particles in the ocean - 99% of them are considered missing.

The new plastic degrades within a week when exposed to sunlight and oxygen.

The new model is able to determine the distribution of contaminated plastic in the ocean and therefore its environmental impact, especially in areas of high concentration.

“Mathematical modeling turned out to beextremely useful for identifying «hot spots» plastic pollution on the surface of the ocean. “I hope this research can be a constructive step in understanding the impact of plastic pollution below the surface and help us ultimately achieve a cleaner ocean.”

Future research by the team will focus on fluid motion in a mixed ocean layer, which will further assess the vertical distribution of microplastics in the ocean.

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