Good News for a change - Arctic Ozone Hits Record High
Ozone concentrations over the Arctic reached a record-high monthly average in March 2024. Due to large-scale weather systems that disturbed the upper atmosphere throughout the 2023-2024 winter, more ozone moved into and persisted in the stratosphere over the Arctic than at any other time in the satellite record.
A team of NASA and University of Leeds scientists reported their findings in a September 2024 paper in Geophysical Research Letters. “Given the absence of high Arctic ozone since the 1970s,” the authors wrote, “the March 2024 record high should be considered a positive harbinger of the future Arctic ozone layer.”
Between December 2023 and March 2024, a series of planetary-scale waves propagated upward through the atmosphere and slowed the stratospheric jet stream that circulates around the Arctic. When that happens, air from the mid-latitudes converges on the pole, sending ozone into the Arctic stratosphere. In addition to the influx of ozone, there was very little of the typical ozone depletion by substances such as chlorine, said Paul Newman, chief scientist for Earth sciences at NASA’s Goddard Space Flight Center and lead author of the study. “It was a very dynamical, active winter in the northern hemisphere,” he said.
More stratospheric ozone is positive for life on Earth. The stratospheric ozone layer is a natural sunscreen, absorbing harmful ultraviolet (UV) radiation. The authors calculated that from April–July 2024, the UV index was 6 to 7 percent lower in the Arctic and 2 to 6 percent lower in the northern hemisphere mid-latitudes. Less UV radiation means less damage to plant DNA and a lower risk of cataracts, skin cancer, and suppressed immune systems in humans and animals.
https://earthobservatory.nasa.gov/images/153363/arctic-ozone-hits-record-high
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Kind of a weird article in that it later says "...average Arctic ozone is not expected to return to 1980 levels until about 2045..." but, according to the included graph up to September, it's been above average since March