Human Remnants Found Buried Deep Beneath Antarctic Ice
An international team of scientists has discovered microplastics and nanoplastics in the soil of Antarctica’s McMurdo Dry Valleys, long considered one of the most remote and pristine environments on Earth. The findings indicate that plastic pollution, as a remnant of human life, has reached one of the most isolated regions on the planet.
The research, led by Lancaster University, found that plastic particles were not only present on the soil surface but were also buried in deeper soil layers. This condition raises new concerns about the impact on the extremely fragile polar ecosystem.
Researchers collected soil samples in January 2023 from various locations in the McMurdo Dry Valleys. Analysis results showed the presence of various types of plastics, including polypropylene, polyethylene, PET, polystyrene, polyvinyl chloride, and tyre wear particles.
Plastic pollution has long been a well-documented global problem, and scientists have previously found large plastics and microplastics in the waters surrounding Antarctica. However, research on soil in the region remains very limited, meaning the spread of plastic contamination on the Antarctic continent is not yet well understood. Antarctic soil is one of the environments least exposed to direct human activity, making the area an important indicator for determining the extent of plastic pollution’s spread.
The research found plastics in the topsoil at 13 sampling locations. Nanoplastics were specifically detected in 54% of these topsoil samples. When researchers dug deeper, they also found nanoplastics in the subsoil layers at half of the sites tested, although in smaller quantities than on the surface.
The research team used a new method called thermal desorption-proton transfer reaction-mass spectrometry. This technique is capable of detecting very small plastic particles that could not be identified with previous detection methods.
The researchers admit they do not yet know exactly how the plastics reached Antarctica. They suspect the contamination originates from a combination of sources. Some pollution likely comes from research stations in Antarctica, while other particles are thought to have been carried atmospherically from very long distances before eventually settling on the ground.
Lead author Nhu Phan, who conducted the research during her doctoral programme at Lancaster University, said the evidence shows that the soil in one of the purest environments on Earth is not free from plastic contamination. The findings highlight the urgent need to study the fate, transport, and ecological impact of plastics in polar regions.
The research team is concerned about the potential impact on the Antarctic ecosystem. Polar environments are considered more vulnerable to plastic contamination than warmer regions because the invertebrate animals there have slower metabolisms and slower growth rates. This condition makes it more difficult for polar organisms to adapt to new chemical pressures they have never faced before.
Study co-author Crispin Halsall from Lancaster University said the findings demonstrate the global reach of plastic pollution. He noted it remains unclear whether the ultrafine nanoplastic particles originate from direct long-range atmospheric transport or from the weathering of larger plastic debris in the marine region along the Antarctic coastline. If the plastic source is primarily local, improved waste management at Antarctic research stations could help reduce contamination. However, if the particles are windborne from various parts of the world, local clean-up efforts alone will not suffice. The researchers concluded that the world needs to strengthen international cooperation to reduce plastic emissions globally, while also tightening waste management in Antarctica. The findings were published in the journal Nature Scientific.