this post was submitted on 20 Oct 2023

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Ozone hole goes large again (www.esa.int)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 38 points 10 months ago (4 children)

Lots of doom and gloom in the comments here. As the article describes, the hole in the ozone layer varies in size over time. It is slowly recovering, but the annual variability means it sometimes is larger than before.

The variability of the size of the ozone hole is largely determined by the strength of a strong wind band that flows around the Antarctic area. This strong wind band is a direct consequence of Earth's rotation and the strong temperature differences between polar and moderate latitudes.

If the band of wind is strong, it acts like a barrier: air masses between polar and temperate latitudes can no longer be exchanged. The air masses then remain isolated over the polar latitudes and cool down during the winter.

Although it may be too early to discuss the reasons behind the current ozone concentrations, some researchers speculate that this year’s unusual ozone patterns could be associated with the eruption of the Hunga Tonga-Hunga Ha'apai in January 2022.

And

Claus concludes, “Based on the Montreal Protocol and the decrease of anthropogenic ozone-depleting substances, scientists currently predict that the global ozone layer will reach its normal state again by around 2050.”

[–] [email protected] 7 points 10 months ago (1 children)

If only all the other ways we’re trashing this planet were as easy to solve as it was to simply ban CFCs

[–] [email protected] 8 points 10 months ago (1 children)

They aren't that difficult either, it just will have a bigger impact because we have been relying on them for longer.

Banning oil and single-use plastics would go a long way.

[–] [email protected] 8 points 10 months ago (1 children)

Yeah, but I’m wondering what can replace rubber tires. I was just reading about how they’re a massive source of microplastics and other pollutants in the environment

[–] [email protected] 1 points 10 months ago

I'd Imagine that some type of aerofoam type thing could work for smaller vehicles like bikes n all

[–] [email protected] 3 points 10 months ago (1 children)

This strong wind band is a direct consequence of Earth's rotation and the strong temperature differences between polar and moderate latitudes.

Sounds like something global warming can make worse.

Isn't the northern hemisphere jet stream struggling due to decreasing temperature differences, since the poles are warming faster? Which then causes weather to change less, making things more extreme?

[–] [email protected] 1 points 10 months ago

Gulf Stream, not jet stream. https://www.bbc.com/news/science-environment-66289494

[–] [email protected] 1 points 10 months ago

so you don't think the increase in methane is gonna effect this?

I dunno about you, but 'lots of doom and gloom' sells short of utterly fucking shocking temp rises in the ocean, the slowing of the gulf stream and the heat-stroke of a winter the southern hemisphere just endured.

meteorologist Brian McNoldy of the University of Miami called global air and ocean temperature trends "bonkers," stating: "People who look at this stuff routinely can't believe their eyes. Something very weird is happening." https://www.axios.com/2023/06/13/climate-extremes-warming-charts-concerns

I'm not trying to fear-monger but I think we'd all be better off frankly recognizing the shit isn't going to hit the fan, it's hitting it rapidly and the backblast is beginning to impact. It's not doom-and-gloom if it's actual reality people are trying to live through.

[–] [email protected] -1 points 10 months ago* (last edited 10 months ago) (1 children)

The hole was set to be normal by now.

[–] [email protected] 11 points 10 months ago

Where did you hear that? CFCs can linger in the atmosphere for 50-100 years, so recovery is a slow process. It took more than a decade after the Montreal Protocol went into effect before the hole in the ozone layer stopped growing. Additionally, different parts of the ozone layer will recover at different rates:

If current policies remain in place, the ozone layer is expected to recover to 1980 values (before the appearance of the ozone hole) by around 2066 over the Antarctic, by 2045 over the Arctic and by 2040 for the rest of the world. Variations in the size of the Antarctic ozone hole, particularly between 2019 and 2021, were driven largely by meteorological conditions. Nevertheless, the Antarctic ozone hole has been slowly improving in area and depth since the year 2000.