But Professor Sonia Creedenweis and her team suspected that the air above the South Ocean would be at least affected by humans and dust from the world’s continents.
The researchers found that the boundary layer of air, which feeds the clouds above and below the Southern Ocean, was free of aerosol particles produced by human activity. – including the burning of fossil fuels, planting of certain crops, production of fertilizers and disposal of wastewater – or transportation from other countries of the world.
The researchers decided to study what was in the air and where it came from, using bacteria in the air as a diagnostic tool to determine the properties of the atmosphere below.
Thomas Hill, a research scientist and co-author of the study, explained that “aerosols that control the properties of SO (Southern Ocean) clouds are strongly involved in the biological processes of the oceans and appear to be isolated from Antarctica microorganisms and nutrient waste from the South.” Said in a statement.
“Overall, it suggests that SO is one of the very few places in the world that has been minimally affected by anthropological activities,” he added.
Scientists created air samples at sea level – the part of the atmosphere that has direct contact with the ocean – aboard a boat traveling south from Antarctic ice to Tasmania, Australia. Scientists then examine the combination of airborne germs, which are found in the atmosphere and often spread thousands of kilometers into the air.
DNA sequencing, source tracking and windback trajectories used by scientist and first author Jun Ota The source of the germs is found in the sea from
From the bacterial fusion of germs, the researchers concluded that distant land masses and human activities such as aerosols caused by changes in land use caused pollution or soil emission were not traveling south and in the air.
Scientists say the results show stark differences between all other studies, ranging from the oceans to both the Northern Hemisphere and the subcontinent, where most of the germs came from the upper continent.
According to the World Health Organization (WHO), air pollution is already a global public health crisis, and kills seven million people each year.
The health agency says more than 80% of people living in urban areas that monitor air pollution are exposed to air quality levels, with health and the agency saying low- and middle-income countries suffer the most exposure.