Solid aerosols found in the Arctic atmosphere can affect the formation of clouds and the atmosphere.

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The Arctic is rapidly losing sea ice, and the less snow, the more open water, and the more open water, the more gas and aerosols that will be released. it is released from the ocean into the air, warming the air and enlarging the clouds.

So when researchers from the University of Michigan aerosol scientist lab Kerri Pratt collected aerosols from the Arctic atmosphere in the summer of 2015, Rachel Kirpes, a medical student at the time, found: It’s not the same. aerosolized ammonium sulfate particles such as conventional water aerosols.

Working with his fellow aerosol scientist Andrew Ault, Kirpes discovered that ammonium sulfate, which is water, is very stable. The results of the group are published in Proceedings of the National Academy of Sciences.

It could change the way clouds in the Arctic work. And as the Arctic snow melts, researchers hope to see more of these free radicals created from the release of ammonia -mixed oceans from birds, which can be dangerous. and to the formation of the heavens and the earth. In addition, understanding the patterns of aerosols in the atmosphere is critical to improving the ability of models to predict the current and future climate of the Arctic and outside.

“The Arctic is warmer than any other part of the world. With more emissions from open water into the air, these kinds of things can become very important,” Pratt said. , associate professor of chemistry, and geology and environmental science. “These types of observations are important because we have very little focus to evaluate the accuracy of the Arctic skyline features.

“With a little bit of observation, sometimes you get amazing things like this when you do measurements.

The aerosols observed in the study are up to 400 nanometers, or 300 times smaller than the diameter of a human hair. Ault, a chemist, said water is water.

When the low temperature rises to 80% —which is about the height of the low sun — the area becomes waterlogged. When you dry the aerosol out, it will not become solid until the contact temperature is around 35% -40%. Because of the low air content over the Arctic Ocean – or any other ocean – the researchers decided to detect water aerosols.

“But what we’ve found is a very new phenomenon where a small particle mixes with our droplet when it’s below 80% low, but above 40% below… Lower than yours. thought, ”Ault said.

“These pieces are more like marble than a droplet. It’s very important, even though in a piece there aren’t many dimensions because those pieces can be finished like a variety of or the consequences that are to come upon them… “

In addition, the researchers say, the size, composition and nature of atmospheric aerosols are related to the change in the atmosphere through rising water levels and the formation of the atmosphere.

“Our mission continues to be to help designers clean up their looks,” Ault said. “It’s not that the models are wrong, but they need more information when events in the world change, and what we’ve seen is unexpected.”

Pratt’s team collected aerosols in August-September 2015 in Utqiaġvik, Alaska’s northernmost point. To do this, they used what’s called a multistage impactor, which is available at many levels to collect pieces according to their size. Later, Kirpes analyzed these fragments in Ault’s lab using microscopy and spectroscopy techniques that were able to observe the nature and distribution of the particles under the surface. 100 nanometers in size.

“If we go back many years to when there was snow near the beach, even in August and September, we don’t look at these parts.” We have to get the truth out of the features that are comparing clouds and space is important to understand the Arctic atmosphere, because this area is changing faster than any other area. ”


The fragments in the boreal forests are embedded in clouds in the troposphere


More information:
Rachel M. Kirpes et al, Solid ammonium sulfate particles deposited on plants at high relative humidity in the Arctic atmosphere in summer, Proceedings of the National Academy of Sciences (2022). DOI: 10.1073 / pnas.2104496119

Presented by the University of Michigan

Directions: Fixed aerosols found in the Arctic atmosphere could affect the formation of clouds and the sky (2022, March 28) Retrieved 28 March 2022 from https://phys.org/news /2022-03-solid-aerosols-arctic-atmosphere-impact.html

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