News & Events
Part of ozone layer still shrinking
Posted on 2018-02-09 in Science & Technology
Illustration of the Odin satellite, which carries the OSIRIS instrument used in the study.
By Chris Putnam
Amid hopeful signs of a recovery, a crucial part of Earth’s protective ozone layer continues to decline.
That is the conclusion of an international team of scientists, including Doug Degenstein and Adam Bourassa of the College of Arts & Science’s Department of Physics and Engineering Physics, whose new study has shown that ozone in the Earth’s lower stratosphere is still thinning.
Several recent studies have found signs that ozone levels in parts of the atmosphere have stopped declining or begun to recover. This welcome change is credited to the Montreal Protocol, the 1987 international agreement to phase out the use of ozone-depleting chemicals.
But the research published on Tuesday shows a more complicated picture. Although a recovery was seen in the upper stratosphere, this improvement was offset by an unexpected decrease of ozone in the lower stratosphere. The researchers found an overall decrease in stratospheric ozone above the planet’s lower latitudes—the region where most humans live.
“The Montreal Protocol was highly successful, but this study highlights the need for continued and detailed global observations of the atmosphere as it evolves in a changing climate,” said Bourassa.
The reason for the continuing ozone decline is uncertain. Since ozone protects life on Earth from ultraviolet radiation from the sun, the causes of the trend “urgently need to be established,” the paper says.
The study made use of measurements from the Canadian OSIRIS satellite instrument. The OSIRIS science team is led by Degenstein and Bourassa, who helped collect and interpret data for the project. They are co-authors on the paper, published in Atmospheric Chemistry and Physics.
“OSIRIS data have played a key role in quantifying the clear recovery of the ozone layer at upper altitudes, while hints of this decline have been observed in the measurements for a few years,” said Degenstein.
The paper caught international attention, with coverage in The Wall Street Journal, Scientific American, The Washington Post and other news outlets.
Novel MRI will monitor astronauts’ health in space
Posted on 2018-05-25
Professor of psychology Gordon Sarty has been awarded a Canadian Space Agency contract to design and engineer an ankle-sized MRI device for the International Space Station
Collaring black bears best part of student’s science studies
Posted on 2018-05-23
Branden Neufeld to receive the award for Most Outstanding Graduate in Environmental Biology
SuperDARN Canada receives funding through province’s Innovation and Science Fund
Posted on 2018-05-22
Headquartered at the U of S, SuperDARN is an international network of high-frequency radars to monitor space weather
U of S group joins worldwide effort to measure brightness of exploding star
Posted on 2018-05-16
Data from astronomy students useful in determining luminosity behaviour of nova
Earthquakes and eruptions
Posted on 2018-05-11
Researchers can’t predict when the next cataclysmic natural disaster is going to occur, but Adam Bourassa can give you a good idea of how it could affect us
Tracking the threat of asteroids and comets
Posted on 2018-05-11
“It would be the biggest destruction that mankind has ever seen,” says Mel Stauffer, geological sciences professor emeritus