Smell of forest pine can limit climate change - researchers say

New research suggests a strong link between the powerful smell of pine trees and climate change.

The fresh scent of pine trees has a significant impact on climate change

Scientists say they've found a mechanism by which these scented vapours turn into aerosols above boreal forests.

These particles promote cooling by reflecting sunlight back into space and helping clouds to form.

The research, published in the journal Nature, fills in a major gap in our understanding, researchers say.

One of the biggest holes in scientific knowledge about climate change relates to the scale of the impact of atmospheric aerosols on temperatures.

Perfumed air

These particles form clouds that block sunlight as well as reflecting rays back into space.

They can be formed in a number of ways, including volcanic activity and by humans, through the burning of coal and oil.

According to the Intergovernmental Panel on Climate Change (IPCC), they "continue to contribute the largest uncertainty to estimates and interpretations of the Earth's changing energy budget."

One of the most significant but least understood sources of aerosols are the sweet-smelling vapours found in pine forests in North America, northern Europe and Russia.

These aerosols have confounded climate models as scientists haven't been able to accurately predict how many of the particles form.

Now an international team of researchers say they have solved the chemical mystery by which the rich odours become reflective, cooling particles.

They've long understood that the smell of pine, made up of volatile organic compounds, reacts with oxygen in the forest canopy to form these aerosols.

The scientists now found that, in fact, there is an extra step in the process, what they term a "missing link".

They've discovered ultra-low volatility organic vapours in the air that irreversibly condense onto any surface or particle that they meet.

"These vapours are so crazy in structure from what we had known before," said one of the authors, Dr Joel Thornton, from the University of Washington.

From BBC -Environment

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