Scientists said the ozone hole was recovering. That good news was premature, one study claims | CNN
www.cnn.com
The recovery of the ozone layer — which sits miles above the Earth and protects the planet from ultraviolet radiation — has long been celebrated as one of the world’s greatest environmental achievements. But a new study published Tuesday claims it may not be recovering at all, and that the hole in it may even be expanding.

The recovery of the ozone layer — which sits miles above the Earth and protects the planet from ultraviolet radiation — has been celebrated as one of the world’s greatest environmental achievements. But in a new study published Tuesday, some scientists claim it may not be recovering at all, and that the hole may even be expanding.

The findings are in disagreement with widely accepted assessments of the ozone layer’s status, including a recent UN-backed study that showed it would return to 1980s levels as soon as 2040.

In 1987, several countries agreed to ban or phase down the use of more than 100 ozone-depleting chemicals that had caused a “hole” in the layer above Antarctica. The depletion is mainly attributed to the use of chlorofluorocarbons, or CFCs, which were common in aerosol sprays, solvents and refrigerants.

That ban, agreed under the Montreal Protocol, is widely considered to have been effective in aiding the ozone layer’s recovery.

But the hole, which grows over the Antarctic during spring before shrinking again in the summer, reached record sizes in 2020 to 2022, prompting scientists in New Zealand to investigate why.

  • uphillbothways@kbin.social
    6·
    7 months ago

    There are some atmospheric spectrometer satellites in place. More resolution from planned missions will make better monitoring possible.

    I’m not up to date on everything in this field, but here’s an example ozone monitoring mission ongoing: https://en.wikipedia.org/wiki/Aura_(satellite)

    This paper mentions several other missions:
    https://www.nature.com/articles/s41377-019-0210-6

    Since the 1990s, numerous space-borne ultraviolet-visible (UV-Vis) spectrometers, e.g., the Global Ozone Monitoring Experiment (GOME)10, SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY)11, Ozone Monitoring Instrument (OMI)12, and Global Ozone Monitoring Experiment–2 (GOME-2)13,14, have achieved the global monitoring of atmospheric trace gases, including NO2, SO2, HCHO, and O3, by using their unique absorption signatures in a shorter wavelength range (250–500 nm).

    Would be nice to be able to pick out individual source polluters for a range of substances. Think that’s on the horizon, but upcoming. (Again, haven’t done a deep or even medium dive on topic in a while.)

    • ormr
      2·
      7 months ago

      Would be nice to be able to pick out individual source polluters for a range of substances

      We can already do that today with inverse modeling of atmospheric substance transport and the satellites you mentioned. Heard a talk about the topic on a conference 4 years ago. That’s how scientists could pinpoint the emission source for some illegally emmitted CFCs in China (and afaik the Chinese govt acted accordingly). With high resolution data you can also use these methods to detect methane leaks in gas pipelines etc.