Turbidity Currents

Recent studies reveal that turbidity currents are in transporting microplastics into the deep sea. These fast-moving underwater flows can be triggered by geological events. The implications for marine ecosystems are deep, necessitating urgent action against pollution.

About Turbidity Current

A turbidity current refers to a fast-moving underwater flow, typically composed of water mixed with dense sediments, that travels swiftly down a slope. Although most commonly associated with water, turbidity currents can also occur in other fluids. Natural examples include snow and rock avalanches, volcanic pyroclastic flows, and lava flows made up of molten rock and debris.

Mechanics of Turbidity Currents

As turbidity currents move, they gain speed and can travel at up to eight metres per second. They transport sediment in a gradient pattern. Larger particles settle first, followed by smaller ones. This process can create underwater canyons and alter the landscape of the ocean floor.

Microplastics

Over 10 million metric tons of plastic waste enter the oceans annually. Most of this plastic is not visible on the surface. Instead, it consists of microplastics that sink into the deep sea. Turbidity currents play important role in distributing these microplastics across vast oceanic areas. They can carry harmful pollutants along with the plastics, posing risks to marine life.

Research Findings and Significance

A collaborative study by several institutions, including the University of Manchester, provides field evidence of turbidity currents transporting microplastics. The research focused on Whittard Canyon in the Celtic Sea. The study observed a turbidity current moving at over 2.5 metres per second, carrying both sediment and plastic fragments.

Microplastics in the Ocean

The microplastics found in the deep sea primarily originate from textiles and clothing. These materials often bypass filtration systems in wastewater treatment plants. As a result, they enter rivers and oceans, contributing to deep-sea pollution. The presence of microplastics in deep-sea ecosystems poses a threat to marine life and the food chain.

Call for Action

The findings of this research highlight the urgent need for stronger pollution controls. Microplastics are not only toxic to marine organisms but also act as carriers for other pollutants. Addressing this issue is crucial for the health of marine ecosystems.

Month: Current Affairs - May, 2025

Category: Environment Current Affairs