Why do Ozone layer is present only in stratosphere? I want to know about the favorable conditions which supports its formation only there ?

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Annu Panwar

Yes that is true that Ozone is present in troposphere which is mostly due to anthropogenic activities. But the thick layer of Ozone in stratosphere must have some reason like is it the favorable temperature or pressure which supports the creation of thick ozone layer at that specific height.

yes. But I am still confused why those reactions only take place at stratosphere. Is it the temperature pressure conditions play a role at that level?

And regarding to Dobson unit, 3 mm thick on how much area. Means per cm2, m2 or the whole Earth's area. These things are not written clearly on any text and sites.

Also please tell me why the Ozone concentrates over poles. Air circulation is enough to do so or any other factors play some role?

Dear sir I know all these things, referred to many articles, may be I am not getting it properly. And what about Dobson Unit( is it 3mm on the whole surface area of Earth or some other unit)? I guess Ozone formation is maximum at Equator due to high insulation but due to circulation pattern it shifts towards the poles. Right?

It is a divergent motion so may be the air mass at equator replaces it

Alastair Bain McDonald

The amount of ozone, in a column of air stretching to the top of the atmosphere, varies from place to place with 300 DU (Dobson units of 0.01mm) being the average over the globe. The average for the ozone hole is 100 DU. There is a web page here which may help you. http://www.theozonehole.com

The IPCC discuss it here https://www.ipcc.ch/ipccreports/tar/wg1/278.htm

Vinod Kumar

Probably we can also explain in terms of the ozone production mechanisms in troposphere and stratosphere.

In stratosphere ozone is formed via photolysis of O2 by UV-A and UV-B rays. O2 is abundant in the air. Even a small amount of NOx and ClOx act as catalyst to fuel ozone loss.

However UV-A and UV-B do not reach the troposphere. The only production pathway is via NO2 photolysis (which is also fueled by OH imitated VOC oxidation). Moreover the loss process are also more in troposphere as compared to stratosphere. You can have a look at Prof. Daniel Jacobs book on atmospheric chemistry (Chapter 10 and Chapter 11)

http://acmg.seas.harvard.edu/people/faculty/djj/book/

Hi Kenneth,

Many thanks for the clarification/correction. Thanks for sharing the article.

Although there is no significant change in climate due to ozone hole. but stratospheric temperature has decreased by 6 degree Celsius and it has fasten the jet streams in southern hemisphere also it has shifted it towards pole. this has shown its impact over Australian rainfall. But now ozone hole is recovering so the effect may be declining. Read the below reference its awesome. And thanks everyone for their valuable answers.

http://onlinelibrary.wiley.com/doi/10.1111/gcb.12739/full

Okay sir got you. Thanks for explaining the reason. Sir kindly you tell me some highlights of project going on Antarctica regarding climate changes?

well this was not so helping. Something serious work in the field of atmospheric sciences and climate change. By the way thanks for that too.and yes it was another question.