Ozone

MIT scientists have uncovered evidence that wildfire smoke particles can lead to chemical reactions in the atmosphere that erode the ozone layer, reports Margaret Osborne for Smithsonian Magazine. “From a scientific point of view, it’s very exciting to see this brand new effect,” says Solomon. “From a planetary point of view… it would be just tragic to have mankind screw up solving the ozone hole by deciding that we’re going to [allow] a lot more of these fires if we don’t mitigate climate change.”

Researchers from MIT have found that wildfire smoke can activate chlorine-containing molecules that destroy the ozone layer, writes Donna Lu for The Guardian. “The question in my mind is: is the man-made chlorine going to get … diluted and destroyed out of the atmosphere faster than global climate change is going to increase the frequency and intensity of this kind of fire?” says Prof. Susan Solomon. “I think it’s going to be a race.”

Axios reporter Jacob Knutson highlights a new study by MIT researchers that finds the smoke released by major wildfires likely reactive chlorine-containing molecules in the atmosphere, delaying the recovery of the hole in the ozone layer. The researchers developed a model that found smoke released by Australian wildfires “chemically depleted between 3% to 5% of the total ozone column in the Southern Hemisphere mid-latitudes in June and July of 2020.”

New Scientist reporter James Dinneen writes that a new study by MIT researchers finds the smoke from Australian wildfires “may have enabled hydrochloric acid to dissolve at higher temperatures, generating more of the reactive chlorine molecules that destroy ozone.” Research scientist Kane Stone explains that “satellite observations showed chemistry that has never been seen before.”

MIT scientists have found that the Australian wildfires in 2019 and 2020 unleashed remnants of chlorine-containing molecules in the stratosphere, expanding the ozone hole and suggesting that more frequent wildfires could threaten the ozone hole’s recovery, reports Dyani Lewis for Nature. “It’s like a race,” says Prof. Susan Solomon. “Does the chlorine decay out of the stratosphere fast enough in the next, say, 40–50 years that the likely increase in intense and frequent wildfires doesn’t end up prolonging the ozone hole?”

Prof. Susan Solomon speaks with Associated Press reporter Seth Borenstein about the Antarctic ozone hole. “’Ozone depletion starts LATER and takes LONGER to get to the maximum hole and the holes are typically shallower’ in September, which is the key month to look at ozone recovery, not October,” says Solomon.

Professor Susan Solomon, geophysicist Joseph Farman, and Environmental Protection Agency official Stephen Andersen were recently honored with this year’s Future of Life award for their “significant role in our triumph over the depletion of the ozone layer,” reports Kelsey Piper for Vox.  

CNN reporter Ivana Kottasová writes that a new study co-authored by MIT researchers finds there has been a significant drop in CFC emissions and a resumption in the recovery of the ozone layer. Prof. Ronald Prinn, director of the Center for Global Change Science at MIT, said that the results were “tremendously encouraging,” adding that “global monitoring networks really caught this spike in time, and subsequent actions have lowered emissions before they became a real threat to recovery of the ozone layer.”

A new study co-authored by MIT researchers finds that factories in China have been emitting a compound banned under the Montreal Protocol that destroys the Earth’s ozone layer, reports Yen Nee Lee for CNBC. The researchers found that “China accounted for 40% to 60% of the global increase in trichlorofluoromethane, or CFC-11, emissions between 2014 and 2017.”

Technology Review reporter James Temple spotlights a new study co-authored by MIT researchers that finds factories in China are using a banned compound. The finding underscores the need for monitoring adherence to pollution accords, explains Prof. Ronald Prinn. “At the end of the day, any treaty that doesn’t have an independent verification mechanism isn’t going to be successful,” he explains.

Axios reporter Andrew Freeman writes that a new study co-authored by MIT researchers finds that factories in northern China have been using the banned CFC-11 compound, which eats away at the Earth’s ozone layer. Prof. Ronald Prinn explains that CFC-11 stays in the atmosphere for 52 years and even “with no emissions, it still lingers on and on and on.”

Gizmodo reporter Maddie Stone writes that a new study by MIT researchers provides evidence that chloroform emissions rose 3.5 percent per year from 2010 to 2015 in East Asia. “If emissions continue to grow at 2010-2015 rates,” Stone writes, “the researchers estimate recovery of the ozone hole could be delayed by up to 8 years.”

New research from Prof. Susan Solomon has found that while banning the use of CFCs caused the ozone hole to shrink by 1.5 million square miles, carbon dioxide is still a major problem. “The chemicals responsible for the ozone problem break down in the atmosphere much more quickly than carbon dioxide connected to global warming does,” writes Faye Flam of Bloomberg View.