Ozone layer

Hi everyone,

What even is ozone? And the ozone layer? Where does the hole in the ozone layer come from and what does it mean? Is it dangerous? What can be done?

Often the ozone-talk can be complicated and confusing, keeping an overview is hard and understanding all the problems always difficult. Let us break it down a bit for you:

What is the ozone layer?

We'll start with the basics: The ozone layer is part of the stratosphere, which is the second layer of the Earth's atmosphere, between 10 and 50 km above the Earth's surface and made up of protective gases. One of these protective gases is ozone. There is not much ozone in the atmosphere, only 0.3 molecule of ozone per 1 million molecules of air. This is because ozone is chemically unstable and only forms when ultra violet radiation (UV light) hits oxygen and breaks the bonds between the atoms. It fact it is so unstable that even when it has formed, it breaks down again relatively quickly. This leads to ozone turning back into "normal" oxygen (two oxygen atoms, O2) and then reforming back into ozone (three oxygen atoms O3) in a continuous cycle. The reason why ozone doesn't naturally form closer to the Earth's surface is that there isn't enough UV light here to break the very stabile bond between within normal oxygen molecules. Because of this even in the ozone layer, ozone is still quite rare compared to other gases: only around 10 ozone molecules per million.

What does it do?

Despite ozone being so rare, it is indispensable. This is because the ozone layer acts a bit like a shield from the sun's UV radiation. This radiation causes sunburns and skin irritation, but also cancers and premature aging. But remember how ozone needs the UV radiation in order to form? It actually absorbs the UV radiation in the process of forming new chemical bonds. And because the ozone is constantly reforming this happens continuously, allowing the ozone layer to absorb up to 99% of the UV radiation from the sun. This allows for life to thrive on the Earth's surface, although don't forget to use sunscreen, because the ozone layer doesn't stop all of the UV radiation.

Is it in danger?

We've all heard of ozone holes before. But what does that actually mean? From the 1970s onwards, scientists have been worried about the human effects on the ozone layer, especially considering how important it is. More specifically, they are worried about chlorofluorocarbons (CFCs) which are chemicals found in many plastic products. For a while, they seemed like a miracle material as they are cheap to produce and are neither poisonous nor flammable. However it was soon discovered that they damage the ozone layer if they're emitted into the atmosphere. They mess up the cycle of ozone breaking down and reforming. More specifically: when the ozone breaks down, it becomes oxygen (O2) and the CFCs then form chemical bonds with the oxygen, preventing it from reforming back into ozone (O3). Over time, this means that less and less ozone is able to form. Luckily, since the 1970s many CFCs have been banned around the world because of this. In fact, the ozone layer is the only aspect on the planetary boundary model that we have made positive progress on.

However this doesn't mean that everything's completely fine. There is currently a huge ozone hole over Antarctica, which is twice the size of mainland Antarctica! Now an ozone hole isn't an actual hole in the ozone layer, it's just means that the ozone layer is a lot thinner in that area. But it is still quite dangerous, especially in concerns of sunburns and skin cancers. The 1987 Montreal Protocol on Substances that Deplete the Ozone Layer has improved the condition of the ozone layer a lot, but the problem is not entirely solved. Some natural disasters are capable of changing the ozone layer as well. For example, the Hunga Tonga-Hunga Ha'apai volcano eruption in 2022 reduced the ozone layer by up to 7% in some areas of the Southern Hemisphere, because it released 35 million tons of water vapour into the atmosphere, which then reacted with the ozone.

We hope you found this post about the ozone layer interesting, and will be back with a new post next Saturday.

Your Green World Blog Team💚

Sources:

https://www.sciencedaily.com/releases/2023/11/231121175239.htm

https://www.sciencedaily.com/releases/2023/11/231120170922.htm

https://education.nationalgeographic.org/resource/ozone-layer/

Image:

“Snapshot of the Antarctic Ozone Hole 2010”, owned by NASA Goddard Space Flight Center (on flickr.com), is licensed under CC BY 2.0.

Comments

Animals 11-15 in our '50 incredible animals' series

Hello, We have another five amazing animals for you today. Enjoy! 11. Dhole This is a dog species which looks rather like a red fox . They are difficult to put into any of the dog subfamilies. They aren't foxes, nor wolves, nor domestic dogs. Dholes are fast runners and live in packs of 5-12 individuals. Although sometimes, different packs will join forces to become a pack of 30 or more individuals! However, these super packs are broken up after a successful hunt. The different packs rarely attack each other as neighbouring packs are often closely related. Dhole packs live in burrows with multiple entrances. They can be found in eastern and southern Asia. They eat wild berries, insects and lizards and as a pack hunt deer, rodents and other wild mammals. Interestingly, unlike other dogs, they rarely kill by biting at the throat. They are also good swimmers! 12. Irrawaddy dolphin The Irrawaddy dolphin can be found in coastal areas of south a...

The life of ... a cicada

Hi everyone, We're back to talk about another animal. Cicadas ( Cicadoidea ) are invertebrates and are 1.9cm to 5.7cm in size. There are 3 000 species that can be divided into annual cicadas and periodical cicadas. Annual cicadas can be seen annually and are found worldwide whereas periodical cicadas only leave the ground every decade or two and are only found in North America with hotspots in the eastern and central areas of the United States. Most annual cicadas have a lifespan of about two to five years and periodical cicadas can live up to the age of 17. Female cicadas lay around 400 eggs split up over several places. They normally lay their eggs on twigs, branches or other vegetation. The eggs hatch after about six to ten weeks, now known as nymphs, and dig their way into the soil. The nymphs feed on the liquids found in plant roots. They fully develop underground, before molting their shells and coming to the surface, now fully deve...

April Top Tips: ten tips for environmentally friendly travel

Hi Everyone! We haven't been very present on the blog again recently but we are back today with ten top tips for environmentally friendly travel. Most forms of travel over long distances (unless you are willing to put in a lot of physical effort) use fossil fuels and are generally not good for our planet. So today we will be giving you a few tips which although won't mean that your travel is 100% planet friendly, will be a good start to doing as much as you can. Your Green World Blog Team💚 1. Use trains and boats rather than planes where possible Planes are awful for the environment. They are, however, extremely practical and so easy to use, cheap...It's hard to avoid them! They are so quick too so you don't have to spend as much time travelling. However, they are really bad for the environment. For example, you could fly once to Edinburgh from Heathrow for the same carbon dioxide levels as driving to Edinburgh 336 times! 2. Fly...

Deforestation and why it’s a problem

Hi everyone, Welcome back to another post. Today we’ll be talking about deforestation and its impacts on our earth. Deforestation, the widespread clearance of natural forests, has been happening for thousands of years. One example is Western Europe, where, two millennia ago, 80% of the land was cloaked in dense forest cover. However, over time, a significant portion of this green expanse was sacrificed to create room for crops, livestock grazing, and as a source of fuel and building materials. Presently, a mere 34% of Western Europe retains its woodland. Today, the tropics deal with the brunt of deforestation. Activities such as mining, agriculture, road construction, and the establishment of vast cattle ranches drive the mass clearance of tropical rainforests. This results in the release of huge amounts of carbon dioxide into the atmosphere, exacerbating the global climate crisis. The consequences come in two waves: first, the reduced number of...

The life of ... a koala

Hello everyone, Today we're talking about koalas. Also known as koala bears, koalas are marsupials. So they're actually not bears. Koalas, phascolarctos cinereus , are tree dwelling and probably best known for spending most of the day sleeping. They live for up to 15 years in the wild although captive koalas generally live for longer. Koalas have a stout, gray body and a cream-coloured chest. They have a broad face, small yellow eyes and big fluffy ears. In adaptation to climbing, their feet are strong and clawed. Adult individuals in South Australia weigh 14kg and are 60-84cm big. Their Eastern cousins are considerably smaller. Koalas are found in Eastern and Southern Australia, where they live in eucalyptus trees. They feed on the leaves of these eucalyptus trees, eating up to 1.3kg a day. With a body weight of up to 14kg, this means they eat just under 10% of their body weight every single day. However, the le...

Photo Essay | dolphin spotting boat ride

Hi Everyone! Quite a while ago now, me and my family went on a dolphin spotting boat ride, and I've been meaning to share some photos for ages now! We saw so many dolphins very close up and we managed to get some good shots, although it can never be as magical as in person! All photos in this post were taken by me or my family. They were so close to the boat! This photo is stunning! It's under the water! Again - under the water! It was so hard to capture them jumping! This was the boat.... ...

October Top tips | homemade presents

Hi everyone, So today we're going to talk about sustainable homemade presents. If you start now, then some of these would make amazing Christmas presents. 1. Knitting, crochet, embroidery & more yarn items You can make some incredible presents by knitting or crocheting with wool or thick yarn. All you need are needles and wool/yarn. Wool can be expensive if you want good quality so check out this post about making your own yarn out a t-shirt! With thinner yarn you could make some amazing thing through embroidery. Here are some project ideas: Scarfs Socks Blankets Jumpers Pouch Dishcloths Table mat Headband Fingerless gloves Keychains Friendship bracelets Wall decorations Handles for hot pots and pans Figurines Bag designs 2. Origami Origami is an amazing way to show someone that you put time into what you made. You can use paper of any size, colour or pattern. Here are some ideas: Swans ...

Overfishing- An Introduction

When writing the article on the Yangtze Finless Porpoise, I briefly touched on the topic of overfishing. Many of you have probably heard about it, and know it is a massive problem threatening our seas and their inhabitants. Overfishing is so destructive, it can kill all life in the ocean, and many of you might be part of it every day. So I read through many articles from international organisations, and they all say pretty much the same things. It's a highly complex topic, with so many things to say and do, so this is just an introduction to the broadest points. It's very interesting (and sad) but when you look into it further you realize there is actually a lot you can do! This is very important, especially for ocean lovers and seafood people. What is overfishing? By definition, overfishing is so intense fishing, people catch fish quicker than the stocks can reproduce. Leading to a massive decrease in stocks that can peak in the extinction of a s...

Ecotourism: what it is, the advantages and the disadvantages

Hi Everyone! Today we wanted to talk about the idea of ecotourism, including the advantages and disadvantages of this concept. If you are looking to reduce your environmental and social impact when travelling, then this is the post for you! Ecotourism is a form of tourism which limits the damage to the environment and local community. It can involve helping in community projects such as planting trees, as well as taking part in local customs and festivals. It helps to keep the local culture alive, while preserving the natural environment. The advantages are abundant. By helping in a project conserving the environment, tourists gain a new understanding and appreciation for the natural world and may be inspired to make changes in their "real" life to live more sustainably. It provides a valuable insight to a country and community, perhaps also inspiring more respect for different people and the lives they lead. The projects also provide sustainable income sources for locals, h...

Animals 21-25 in our '50 incredible animals' series

Hi Everyone! Here are the next five animals in our current series! We hope you learn something from this. 21. Stick insect Stick insects are masters of disguise. They look like twigs or leaves. This strange appearance makes them hard to spot when stationary. Stick insects are herbivores, feeding on leaves, and can live for up to three years. Their habitat includes most tropical and subtropical regions, but there are a few species that live in temperate areas as well. There are roughly 3 000 different stick insect species! Not much more is known about them, because they are difficult to find. The two main threats to their populations are the pet trade and people killing them so as to frame their carcasses, like butterflies. Their conservation status ranges from critically endangered to least concern - so basically every category that is on the list! 22. Glass frog The glass frog is, well, see through. You can literally ...

Green World

Search This Blog