United States: Researchers have found that biological aerosols contribute to the cloud nucleation process in the Arctic region.
For a while, we’ve known that clouds need tiny particles’ surfaces to condense water. Various substances, such as sea salt, dust particles, and even microplastics, can initiate cloud formation.
“We could identify the proteinaceous component of ice nucleating particles, shedding light on their potential biological origin,” University of Basel environmental geoscientist Mr. Franz Conen said.
“Our findings unequivocally establish the prevalence of biological particles contributing to ice nucleation at Zeppelin Observatory,” Mr. Conen added.
The Research was published in the journal Nature Communications. Stockholm University physicist Mr. Gabriel Freitas and his team filtered tiny particles from the air above the observatory on Zeppelinfjellet mountain in Norway.
The team examined the samples using light scattering, UV fluorescence, and transmission electron microscopy. They obtained sufficient data to identify and measure the tiniest amounts of each type of particle.
“Precision is essential as we navigate through the challenge of detecting these particles in minuscule concentrations, akin to finding a needle in a haystack,” Mr. Freitas remarked.
When the temperature and humidity are right, moisture in the air condenses on small particles and transforms into ice crystals, ultimately creating clouds.
Understanding the characteristics of these particles is a significant unknown factor in climate models. In comparison to other areas, the Arctic has fewer aerosol particles. Consequently, even small alterations in these particles can greatly impact the weather. In the upper atmosphere, amidst gases, dust, and water vapor, the researchers identified particles originating from biological sources.
These particles primarily consisted of fructose and sugar alcohols like mannitol and arabitol, accounting for over 90 percent of biological particles during the summer season. Mr. Freitas and his team observed that the quantity of biological aerosols varied with the seasons.
Furthermore, as global warming continues to melt ice and snow, revealing more land and ocean, there may be a rise in concentrations of biological particles. This will likely enhance cloud formation and precipitation, leading to additional melting of previously frozen areas.
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