Smoke from major wildfires destroys the ozone layer
Date:
March 17, 2022
Source:
University of Waterloo
Summary:
A new study shows that smoke from wildfires destroys the ozone
layer.
Researchers caution that if major fires become more frequent with
a changing climate, more damaging ultraviolet radiation from the
sun will reach the ground.
FULL STORY ==========================================================================
A new study shows that smoke from wildfires destroys the ozone layer.
Researchers caution that if major fires become more frequent with a
changing climate, more damaging ultraviolet radiation from the sun will
reach the ground.
========================================================================== Atmospheric chemists from the University of Waterloo found that smoke
from the Australian wildfires of 2019 and 2020 destroyed atmospheric
ozone in the Southern Hemisphere for months. The ozone shield is a part
of the stratosphere layer of the Earth's atmosphere that absorbs UV rays
from the sun.
The researchers used data from the Canadian Space Agency's Atmospheric Chemistry Experiment (ACE) satellite to measure the effects of smoke
particles in the stratosphere. The results appear in the journal Science.
"The Australian fires injected acidic smoke particles into the
stratosphere, disrupting the chlorine, hydrogen and nitrogen chemistry
that regulate ozone," said Peter Bernath, research professor in Waterloo's Department of Chemistry and lead author of this study. "This is the
first large measurement of the smoke, which shows it converting these ozone-regulating compounds into more reactive compounds that destroy
ozone." Similar to the holes over polar regions, this damage is a
temporary effect, and the ozone levels returned to pre-wildfire levels
once the smoke disappeared from the stratosphere. But an increase in
the prevalence of wildfires would mean the destruction happens more often.
"The ACE satellite is a unique mission with over 18 continuous years
of data on atmospheric composition. ACE measures a large collection of molecules to give a better, more complete picture of what is happening in
our atmosphere," Bernath said. "Models can't reproduce atmospheric smoke chemistry yet, so our measurements provide a unique look at chemistry
not seen before."
========================================================================== Story Source: Materials provided by University_of_Waterloo. Note:
Content may be edited for style and length.
========================================================================== Journal Reference:
1. Peter Bernath, Chris Boone, Jeff Crouse. Wildfire smoke destroys
stratospheric ozone. Science, 2022; 375 (6586): 1292 DOI: 10.1126/
science.abm5611 ==========================================================================
Link to news story:
https://www.sciencedaily.com/releases/2022/03/220317143749.htm
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