Talk:Ozone layer - Knowledge

2301:

molecules are indeed several times heavier than air, thousands of measurements have been made from balloons, aircraft and satellites demonstrating that the CFCs are actually present in the stratosphere. The atmosphere is not stagnant. Winds mix the atmosphere to altitudes far above the top of the stratosphere much faster than molecules can settle according to their weight. Gases such as CFCs that are insoluble in water and relatively unreactive in the lower atmosphere (below about 10 kilometers) are quickly mixed and therefore reach the stratosphere regardless of their weight. Much can be learned about the atmospheric fate of compounds from the measured changes in concentration versus altitude. For example, the two gases carbon tetrafluoride (CF4, produced mainly as a by-product of the manufacture of aluminum) and CFC-11 (CCl3F, used in a variety of human activities) are both much heavier than air. Carbon tetrafluoride is completely unreactive in the lower 99.9 percent of the atmosphere, and measurements show it to be nearly uniformly distributed throughout the atmosphere as shown in the figure. There have also been measurements over the past two decades of several other completely unreactive gases, one lighter than air (neon) and some heavier than air (argon, krypton), which show that they also mix upward uniformly through the stratosphere regardless of their weight, just as observed with carbon tetrafluoride. CFC-11 is unreactive in the lower atmosphere (below about 15 kilometers) and is similarly uniformly mixed there, as shown. The abundance of CFC-11 decreases as the gas reaches higher altitudes, where it is broken down by high energy solar ultraviolet radiation. Chlorine released from this breakdown of CFC-11 and other CFCs remains in the stratosphere for several years, where it destroys many thousands of molecules of ozone."

1526:

an electron in any given situation will be able to absorb some wavelengths of light but not others, based on whether there is a jump available to a higher amount of energy or not (following the analogy above, if a photon hit your car with the amount of energy that is the difference between 10 MPH and 22 MPH, your car could start zooming at the higher speed, but if it were carrying the amount of energy equal to the difference between 10 MPH and 28 MPH, your car could not "catch" that energy and change speed). It so happens that in ozone, the electrons in the molecule have two amounts of energy possible that are the same amount of energy apart as that contained in a UV photon. Electrons in other molecules may not have two different levels of energy that are that difference from each other, so they could not absorb a UV photon. They could absorb a different color of light, though, if that color photon had the amount of energy that corresponded to the difference between two of their energy levels.

2541:- Information in Distribution in the Stratosphere section is biased towards Americans, reading "Research has found that the ozone levels in the United States are highest in the spring months of April and May and lowest in October. While the total amount of ozone increases moving from the tropics to higher latitudes, the concentrations are greater in high northern latitudes than in high southern latitudes, with spring ozone columns in high northern latitudes occasionally exceeding 600 DU and averaging 450 DU whereas 400 DU constituted a usual maximum in the Antarctic before anthropogenic ozone depletion." In order to maintain neutrality in the article and also to deliver best information, this section discussing the Distribution in the Stratosphere should take into account various countries and their ozone distribution. 1127:

that these new molecules are as dangerous as the old is illogical. In fact the overall costs associated with these new refrigerants are much higher. The older CFCs are not as acidic; these new hCFCs require more robust seals. Many refrigerating systems are being scrapped or refitted(if feasible) to accommodate this acidic condition. Then there is the efficiency factor. Since the hCFCs are less efficient, there is a correspondingly greater input of energy to achieve the same output as measured in tons of ice per day. Pollution and cash outlays increase as output efficiency decreases. I have read some accusations about the patents on these chemicals(and PCBs) and the vigor of the debate being related. If anyone has access to the dates of these patents please share them.

1812:

work, I have found and have read that when using a "freon" leak detector, one must always place the meter underneath the suspected leak point to measure any "freon" escaping, and that placing the detector above the point will not trigger the meter, because the CFCs and HFCs are heavier than air. OK, if that is so, and the ozone layer allows only a small amount of UV light to strike earth's surface, I can understand that small amount of UV will break down those chemicals at ground level causing chlorine to be released. Now, according to wikipedia, the atomic weight of chlorine is heavier than air. So how can this chlorine rise eight miles into our atmosphere to deplete the ozone layer? An educated reply would be greatly appreciated.

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what, if any, natural causes there may be for its density to change over short time intervals. Thus, although the case for the role of chlorofluorocarbons is convincing, it is difficult to say if even it is the culprit (or at least if it did or didn't have help from other gases). My own opinion is that a responsible society should always act to curtail the addition of substances deemed potentially hazardous even if there is compelling but not necessarily absolute evidence (which is the case for chlorofluorocarbons), since the balance of nature is far too complex a thing to risk toying with."

1935:

by more than a billion years. Water does scatter UV radiation effectively, so very little penetrates more than a meter into the sea. However, the fact that UV can severely limit survival on the surface doesn't mean that no individuals at all would survive, and for rapidly reproducing, unicellular life forms UV probably wouldn't kill absolutely everything. In fact the higher rate of mutation due to UV radiation may have sped up evolution, while at the same time limiting the total biomass possible on the surface.

2369:

split the ozone, which absorbs their 1.062 ev of energy, and the reverse direction recreating the ozone in that cycle then releases that same 1.062 of ev as thermal energy. One can think of the latter as combustion of O in O2 with the 1.062 ev being the heat released by that combustion. The lapse rate is negative because the additional oxygen atoms being fed into the ozone-oxygen cycle by the splitting of oxygen atoms by UV is decreasing with altitude as the UV gradually declines with altitude.

200: 254: 465: 233: 608: 2396:: "Secondly, there is evidence from laboratory and field studies that there is a systematic difference between the absolute values of ozone absorption cross-sections in the ultraviolet (Hartley and Huggins bands) and mid-infrared line intensities (at room temperature), of about 4–5%." So at least there is an infrared connection with the 102.46 kJ/mol, but then why the much greater energy in the UV? No time for this right now, I'll dig into it next week. 1504:

is occurring? It explains in the article the process of UV light striking oxygen and producing ozone, which off-hand sounds as if it is the oxygen itself that is doing the blocking and the ozone is just a by-product of that reaction. I see words like 'absorb' and 'screened' but there is no actually explanation as to what the ozone is physically doing. Why is ozone so good at 'absorbing' and 'screening' UV? There isn't an explanation in the whole article.

264: 378: 360: 680:, you'll notice that the formation of the ozone takes a collision of 3 particles and thus the formation rate is proportional to the third power of the air density, the disintegration of ozone takes only a collision of 2 particles and thus the rate should be proportional to the square of the density. Therefore the relative concentration of ozone should decrease with decreasing density, everything else being equal. 455: 428: 1973: 2475: 1830:- err, pause to think for just a moment. Are you also puzzled by the fact that the major constituents of the atmosphere - O2 and N2 - have different weights but don't separate out under gravity? If not... why not? Indeed, why aren't you puzzled that the minor consitiuents - which includes heavy noble gases - don't separate out. Pause to think about this for just a little while before reading 2605: 191: 912:

temperature in ° C, from the baseline value for 1900. Compiled by R. S. Bradley and J. A. Eddy based on J. T. Houghton et al., Climate Change: The IPCC Assessment, Cambridge UniversityPress, Cambridge, 1990 and published in EarthQuest, vol 5, no 1, 1991. Courtesy of Thomas Crowley, Remembrance of Things Past: Greenhouse Lessons from the Geologic Record

2050: 2654: 2547:- there are a few sources that do work but are however very very old, dating back over 20 years. Just because the Ozone layer was discovered long ago does not mean sources supporting the Wiki page need to be from then as well! It would be preferable to have updated and less hegemonies of info from solely American publications. 2364:

So while it is clear that splitting the O2 into 2 O is an endothermic reaction requiring a UV photon, I'm dubious about the conventional wisdom that it is UV that splits ozone into O2 + O. Given that there are more red photons than UV photons from the Sun, I would expect near infrared photons to be

1850:

Just because a gas molecule is heavier in atomic weight than ambient air doesn't mean that it cannot disperse due to diffusion, wind and natural air movement. It can't separate out because the effect that gravity has on gas molecules is negligible. Gas particles naturally diffuse through the air just

1279:

Evolutionarily you would probably see the same thing that you already see nowadays in native populations (i.e. living there for many millenia) of high-insolation countries vs. low-insolation countries: The skin will darken. Of course that doesn't take into account changes in lifestyle, sunscreen etc.

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A further point: the major substitutes for CFCs are not HCFCs, but HFCs (hydrofluorocarbons) which contain no chlorine. E.g. in the US, the mandated substitute for CFC-12 in auto air conditioners is HFC-134a. HCFCs are only being used as temporary substitutes in some applications where the transition

867:

You claim my text was my personal opinion and trying to convince people of my point of view, then explain to me how the claim that the text saying current ozone depletion and "increase in Cl and Br lately is increased markedly due to the release of large quantities of manmade organohalogen compounds,

2388:

At the AGU fall meeting today I asked an ozone expert and she said that ozone had a very large cross section at around 250 nm. Since this doesn't match the figure of 102.46 kJ/mol for enthalpy of formation of ozone from O2 + O I'm now very curious as to what's going on here. Perhaps that figure is

2368:

That's not say that the second equation, O + O2 ↔️ O3, doesn't account for the role of ozone in giving the stratosphere its negative lapse rate (higher temperatures at higher altitudes), only that infrared photons suffice to drive that cycle. From that viewpoint, what the infrared photons can do is

1919:

Hello, the article states that "...medium-frequency UV, which potentially damages exposed life forms on Earth." I suppose the exposed life forms discussed are mainly life forms on land. How do plants on land react to excessive UV? Ozone was a prerequisite for life to extend to land, but would marine

1811:

I am puzzled about CFCs and HFCs causing ozone depletion and hope someone will response to my points. According to wikipedia, those chemicals' molecular weights are heavier than air, so how can they rise into the ozone layer and deplete it? As a heavy equipment mechanic who performs air conditioning

1503:

Hi, I came to this article with a question about the ozone layer and it wasn't answered here at all. I'm trying to understand how the ozone layer acts as a UV shield. The article explains that the ozone layer blocks '93-99% of the sun's high frequency ultraviolet light' but my question is, how? What

1098:

I don't care even what chemicals we find in the atmosphere, we could find one billion tons of CFC's there, and only one million tons of organic/inorganic chlorine compounds, but if only .000001% (10 tons) of them break down into chlorine on a yearly basis, and .1% (1,000 tons) of the other compounds

1053:

You seem to be having problems telling "science" from "popular press"; your article falls into that category. The trop chlorine stuff is in the FAQ, of course: volcanoes, ocean stray et produce *soluble* chlorine that never reaches the stratosphere; whereas CFCs do get to the strat and there release

2100:

A bit confused - the article appears to have been the 'article for improvement' a day short of three years' ago, but has its time come again? I've restored a graph removed in 2009 for what I think appear to be spurious reasons and added a note on how the ozone layer affects UV astronomy as my first

1934:

Hartz - the ozone layer could not have formed before the evolution of photosynthesis, because this process caused the large amount of oxygen currently found in the atmosphere to arise. The molecular oxygen is necessary for ozone to be formed by UV radiation. So life clearly preceded the ozone layer

1788:

Looking at this article I think the graph is perfectly appropriate, most WP users who can read a graph understand that the axes do not necessarily cross at the zero point and a graph without that would be barely readable. Plus the extent of the seasonal variation is far greater than the statistical

1525:

Electrons have different energy "levels" to jump to based on their position near other particles, and they can never be in between these energy levels (imagine your car could have the amount of kinetic energy to be traveling 10 MPH, or the amount of energy for 22 MPH, but never 13MPH or 28 MPH). So

1126:

Relevant to this discussion but missing are some questions about science and politics. First thing is why are hCFCs any safer? If we stipulate that CFCs are bad, we must continue logically to conclude that hCFCs are bad. The molecules are identical except for a little bit of Hydrogen added. Denying

927:

If we were able to measure the level of Ozone as far back as 1000 AD, I would be willing to bet that the largest decrease in stratospheric temperature was around 1000 - 1400 AD, and the largest (perhaps larger than today) decrease in the level of ozone would ALSO be from 1000 - 1400 AD. Similarly,

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2. Ozone concentrations of up to 10 parts per million occur in the ozone layer, according to ENCARTA. O2 concentrations in the atmosphere is about 2 parts per 10 or 200.000 parts per million. So for every mol O3 ther are 20.000 mol O2. Why are there so few ozone molecules while there is EMR and O2

630:

Reading about ozone and the ozone layer in Knowledge and other sources left a lot of questions to answer. So I ventured a bit farther in the field and gathered enough data about electromagnetic radiation (EMR), the properties of photons end the interaction between electrons and photons, especially

2300:

Actually, this question has been thoroughly and exhaustively answered. One only needs to conduct a quick google search to find the answers. For ease of access, here is the question answered in the World Meteorological Organization 'Scientific Assessment of Ozone Depletion: 1994', "Although the CFC

1519:

In general, electro-magnetic radiation is absorbed by matter when the energy of the EMR photon is used to push electrons away from the nucleus of its atom. This can only happen if the difference between the old energy of the electron and the new energy of the electron, and the energy of the photon

1198:

to here? I am not very happy with that page - too small really and does not really to my mind get across the essentially cyclic nature of the Chapman cycle. It would be nice to include the standard exercise calculating the expected ozone concentations which one gets from the Chapman cycle (time to

1103:

please provide some evidence for your assertions. No scientist denies that there is a small component to stratospheric chlorine from natural sources. However there are plenty of studies based on observations and modelling which show that the most important source of chlorine in the stratosphere is

1252:

The idea behind natural selection is that beings adjust to their environment. Is there any reason to believe that this would not happen with increased UV? Note, I'm not asking whether we would like it or not. :) I've also seen mention that suntan lotion may be responsible for some skin cancer,

757:

This page contained a number of scientifically incorrect statements. I've just corrected these, but I think the page could use a more substantive rewrite, focussing on the basic physics and chemistry of the ozone layer instead of on ozone depletion, since the latter subject has a page of its own.

2334:

In the first (Sources) section of the body of the article, the first equation includes UV for the splitting of O2 to 2 O, but the second equation describing the splitting of ozone via UV to form O2 + O omits the UV referred to in the preceding text. To be consistent, shouldn't the role of UV be

1094:

Similarly, out of the 600,000,000 tons of natural chlorine sources that enter the atmosphere, do you think that even .01% of that MIGHT reach the stratosphere, break down, and then stay there stored in the form of inorganic chlorine reservoir molecules, until they break down again and are either

1090:

Dr. Ken Kubin, Assistant Professor department of Geology and Geophysics, University of Hawaii - "One final point that is probably worth noting is that it is important to remember that our monitoring of the exact nature of the ozone layer has only begun recently, and we have a very poor handle on

2163:

I once wrote an article for a newspaper confessing that I had personally destroyed the entire Ozone Layer over Australia because I used a small aerosol can of Freon, as an electronics technician. The truth is that the Freon immediately fell downwards where soil bacteria digested it within a few

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Example of regional variations in surface air temperature for the last 1000 years, estimated from a variety of sources, including temperature-sensitive tree growth indices and written records of various kinds, largely from western Europe and eastern North America. Shown are changes in regional

833:

Nice job, William and SEWilco. I just deleted some of my old text which has been made redundant by your additions. I think there are other redundancies that could be cleaned up over time. Also, I suggest moving the figure at the head of Amount of Ozone down to Ozone depletion, where it is more

2344:

the enthalpy of formation of O2 + O from O3 (OOO as represented there) at 0K is 102.46 kJ/mol, making it an endothermic reaction. In electronvolts, writing N for Avogadro's constant and eV for the number of joules in an electronvolt, that's a mere 102460/N/eV = 1.062 ev per ozone molecule, a

990:

Sigh. First off, you're dead wrong: wikis policy *is* to report the current consensus. If you have a personal pet theory that through sheer brilliance overturns the accepted wisdom... it doesn't belong here. As it is, you have a pile of nonsense, which also doesn't belong. Secondly, trying to

971:

Scientific. Tests have shown that ozone is broken down into oxygen when exposed to chlorine, which works as a catalyst. Molecular theory supports this. Chlorofluorocarbons act as a delivery system for chlorine, as they rise into the stratosphere and are broken down into their base components.

768:

I'm new to this wiki stuff, but can someone please correct this entry. The entire segment entered by "Barwick" is very POV, and if left on the page at all, it should be in a subsection of "Ozone depletion skeptics." Haroun Tazieff is an 80 yr old volcanologist with little experience in ozone

1743:

over a 23 year period, but it's also a lesson from misrepresenting statistics 101. The vertical component wildly misrepresents the seasonal variation, as it represents approximately 1/8th of the axis as measured from 0 DU, and it gives no indication of any error margin given by the measuring

876:

There is absolutely NO scienific evidence that proves this, it is simply speculation based on a correlation between CFC's being used and a decrease in ozone. It would be almost as valid to say "Joe Smith was born in Argentina in 1965, and a few years later the ozone started getting thinner,

959:

WMC: You're going to have to do more than "it's generally accepted today"... 150 years ago it was generally accepted that it's ok to have blacks as slaves, that doesn't mean it was right. Today it may be "generally accepted" that manmade CFC's are the devil (after all, when the media and

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standard deviation of 2%, which is a significant portion of the area of the graph as depicted. I can understand why this information is not represented in the graph, as it is a small part of a greater body of information, however it is not presented with the appropriate caveats here.

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also has a thin ozone layer at an altitude of 100 kilometers above the planet's surface." This sentence threw me off in the first paragraph, if anything, this sentence should be a part of a separate section talking about fellow planets with ozone layers and similarities amongst

1896:

My quick search I did not notice the term in any peer reviewed papers. So, due to the remaining controversial political arguments on this topic, I wonder if the term was invented with an agenda. ("Science is actually part of The Great Evil Liberal Conspiracy Plot!") Thoughts?

1209:

Seems sensible to me. That article always seemed to be something of an outlier. BTW, I haven't ever seen it referred to as the "ozone-oxygen cycle" anyway, it's always been "Chapman Mechanism" or "Chapman Cycle", but that just might reflect the sources that I tend to

1387:) Sunlight splits oxygen O2 into O1 and O1. These O1 particles combine with other O2 particle to form O3 (ozone) which is inherently unstable and breaks down quickly. Sunlight continually replenishes the ozone, except during polar winters when sunlight is absent. 1355:

The article mentions that "stratospheric ozone is produced by solar UV radiation", but that's the extent to which it's discussed. Could a knowledgeable person write a section explaining why the ozone layer exists? (Prompted by a short unsigned question over at

2510:

since the ozone layer is part of the larger issue of CO2 output and atmospheric sciences, would it be wise to perhaps update the introductory citation to a newer and more frequently updated source? I found this source from the Environmental Protection Agency:

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removed, or again become another inorganic reservoir molecule in the stratosphere? Or do you think that the filtering mechanisms are that good to remove every single possible source of natural chlorine from the atmosphere, before it reaches the stratosphere?

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as 41270 cm. This is easier to convert to a wavelength than kJ/mol: since there are 10^7 nm in a cm, the wavelength is 10^7/41270 = 242.3 nm, clearly UV. (In electronvolts this is h*c*4127000 joules or 5.117 ev, which is in excellent agreement with the

1888:

I noticed a new term; "ozonosphere." In fact, Wiki redirects it to here. I wonder if it's legit. Googling around, it does seem to be in a few dictionaries. Yet the term in nowhere in any of say, Robert Parson's four 1997 Ozone Depletion FAQs:

1667:

Having seen mention of a 1979 ban at the EPA's website and the Stocholm Convention's website, neither providing a date or scope of the mentioned ban, I can only speculate. Whatever it was, it doesn't appear to have been written into Sweden's law.

2372:

This has left me baffled as to why people believe that the ozone-oxygen cycle is driven by UV when it would appear that the more copious red portion of the spectrum is perfectly capable of driving it. Did I miscalculate something somewhere?

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Ec5618: Had you been paying attention, you would have seen that I'm not disputing that the ozone is broken down by these chemicals, I'm disputing that MANMADE SOURCES are the primary cause. NOBODY can show ANY scientific evidence that it is.

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The ozone layer visible from space at Earht's horizon as a blue band of afterglow within the bottom of the large bright blue band that is the stratosphere, with a silhouette of a cumulonimbus in the orange afterglow of the troposphere.

2365:

doing most of the splitting of ozone. That UV is absorbed by the stratosphere would then be accounted for solely by splitting of O2 into 2 O, augmenting the supply of oxygen atoms in the ozone-oxygen cycle driven by infrared photons.

1229:

The article says that the ozone layer does not occur higher because the oxygen is ionized. Why does it not occur lower (this may have been answered already; I'll have to look again more closely)? How much of the ionization is due to

1034:

Sorry, didn't see any evidence proving that the miniscule amount of manmade CFC's that reach the stratosphere are the PRIMARY CAUSE of the ozone depletion, simply another "correlation equals causation" argument is presented.

1575:

I was wondering, why is the ozone layer up in the stratosphere while ozone is heavier than normal air, I'd say the normal air should "float" on the ozone layer. of course, that wouldn't be healthy, but that's not an answer.

936:

Now, just like the "manmade CFC's are the devil" argument, we can't scientifically measure either of them, and therefore you've got two choices: One, put NEITHER of them on the page or Two, put BOTH fo them on the page

1390:

The maximum chloroflurocarbon (Freon) detected in the 'Ozone Layer' has bee about five cubic millimetres per thousand cubic kilometres - equivalent to nothing! Freon is heavier than air and iron - it falls downwards.

1548:

I am not very educated and some articles probably have already answered my question. Do we have the technology yet to replenish the ozone layer? If so, are we doing it or the price is too expensive to do so.

1273:

I think the ozone layer has got a lower limit because there isn't enough atomic oxygen in the troposphere, because there isn't enough UV radiation to create it, because this UV radiation is blocked by the ozone

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so in school i was picked to do a science presentation on the ozone layer with two of my friends but I'm still struggling a bit Pls post some articles that are explained so a child can understand easily thx!

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The DuPont company did not want competitors to make Freon after the patent expired and paid for the Montreal process to ban its own product. Consumers were forced to buy the new replacement refrigerant.

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destroy much less ozone than CFCs. However they are also being phased out as they can still destroy statospheric ozone. The main tropospheric removal processes for these compounds are reaction with the

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introduce strawmen like "CFCs are the devil" may work in playground drebates, but not here. We've seen it all before. As for science: please continue the discussion that you've wimped out of over at

634:

1. About ozone in the atmosphere. Above the region where the ozone layer is situated a lot of air is found and of course enough EMR with frequenties of UV or higher. So why no ozone is found there?

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i wanted to know that since all the major developed countries release more amount of cfc then why the ozone layer of antarctic deplets and why not the ozone layer above that particular country?

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The article doesn't give the "thickness" (that is, distance from bottom to top) of the ozone layer. This link from Caltech gives information that I would like to see explained in the article.

1041:

It is generally agreed that natural sources of tropospheric chlorine (volcanoes, ocean spray, etc.) are four to five orders of magnitude (1,d000 to 10,000 times) larger than man-made sources

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The Ozone Layer does not prevent the type of ultraviolet radiation that causes skin cancer. The ozone hole was detected before DuPont invented chlorofluorocarbons. It will occur forever.

1256:

What percentage of total UV is filtered out at each step? If the amount of ozone would only be a few millimeters thick at sea-level, then it seems like ozone alone would not catch much.

1686:- The EPA has informed me that they cannot locate any information within their main information storage center as to Sweden's ban other than the press release. Details of the email are 2436: 1339:(by industrial and developing countries). As besides CFC's this too has extremely high ozone depletion value it should be described. Besides this, there should be a list or reference 897:) over time, resulting in an increase (or decrease as they get lower) in earth surface temperatures, which also means that less heat escapes to the stratosphere, thereby cooling it. 2700: 1317:

Its not a very good answer. Thats the thickness it would have if it were just a layer of pure ozone (at SLP?). The thickness of the atmos layer that ozone occurs in in is ?30 km?

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I think the figure showing "ozone amount" belongs with "Amount of Ozone". "Ozone depletion" can use improvement, but without sucking in all of the main article on the topic. (

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Hello, I'm pretty new to Wiki editing so I was perusing the sources when I saw the first source cited led me to a pretty old page on the Way Back Machine This is the source:

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chemistry. His opinions are fringe at best, wrong at worst. The entire entry about his work is not original, but simply cut and pasted from a conspiracy theorists webpage.

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the largest incerase in stratospheric temperature would probably be around 1400 AD to 1950 AD, also with the largest increase in the level of ozone in the stratosphere.

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Don't quote me on this (rparson will know for sure) but I think that HCFCs are less stable and so break up faster and so don't cause the same probs in the strat.

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and you'll see various gases are energized above. Note the high temperatures reached up there. Above a certain point one gets oxygen plasma instead of ozone. (

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Chlorofluorocarbon molecules are 4-8 times heavier than air but we are told they rise into the upper atmosphere. How? Does helium ever sink towards the Earth?

1622:

and the higher depletion at the poles is due to concentration of ODS by certain wind patterns and the faster chemical reactions that can occur on ice crystals.

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20:35, 15 Apr 2005 (UTC)) Would be fine by me. Its probably best to just do things like that, and back off if anyone complains, which in this case is unlikely.

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What's with the inclusion of the graph TOMS_Global_Ozone_65N-65S.png? OK, it demonstrates an observed ~5% depletion on equatorial ozone as measured in

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While I have no doubt that it represents significant data, I believe that it is wildly misrepresentative when presented out-of-context in this manner

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dig out some old notes...) and explain that this concentration is wrong because of the catalytic destruction reactions. These could then be listed.--

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There are PLENTY of other explanations for the changes in the levels of ozone, one of which is the fluctuation in natural greenhouse factors (C0

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or N? We have an entire atmosphere worth of oxygen molecules. Can we get some figures on how much UV is stopped by the ionized oxygen, etc.?

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error and the decline is larger. I'm restoring the graph as illustrating variations in ozone over time as it certainly adds to the article.

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CFCs upset the balance of ozone and oxygen and cause ozone to be broken down faster than it can be formed. Science. What's the problem? --

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which was last updated on June 16, 2021. Please tell me what you think and I can begin to edit the introductory paragraph. Thank you, --

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I think the ozone layer contains relatively high concentrations of ozone(03). this layer absorbs 93 - 99 % of the suns powerfull rays

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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

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life forms be safe from UV if there were no ozone layer? I believe there were cyanobacteria before the ozone layer had developed. --

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Ozone layer is a layer which is a layer which protect the earth from ultraviolet race of sun . ओजोन लेयर लाइज बिटवीन मी सॉफ्टवेयर

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https://chemistry.stackexchange.com/questions/6709/why-is-density-functional-theory-notoriously-bad-at-describing-oxygen-molecules

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in gases. My questions were not answerd by this, but I can formulate them more precisely,so here we go.Just a few for starters.

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There used to be a section on this, but some vandal deleted it way back when and it was never restored. I've put it back in.--

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However I worry about whether it's actually UV that splits the ozone. The conventional wisdom that it does is spelled out at

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https://web.archive.org/web/20140826115142/http://stsclimate.soc.ku.dk/papers/grundmannclimatechangeandknowledgepolitics.pdf

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The usual answer to "why" is "money". But the article needs sources which state why before the article can state why. (

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Anyone else care to chime in with something scientific, and not an "appeal to authority" like WMC continues to do?

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HFCs are substitutes for CFCs and HCFCs; they do not cause ozone depletion. However they do cause global warming.

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Sources of Greenhouse gases and their reaction with the ozone-layer; NOx, SOx can arise from combustion processes

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those chemicals' molecular weights are heavier than air, so how can they rise into the ozone layer and deplete it

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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the

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WMC: that's really interesting how you KNOW that no chlorine from natural sources reaches the stratosphere.

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is much shorter, so a far smaller percentage of the chlorine atoms reach the stratosphere. Therefore they

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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with

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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with

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Sigh again. That is the good old schematic from the IPCC FAR. Things have moved on somewhat since then.

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determined binding energy of an oxygen molecule as given at the end of the second yellow paragraph in

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The miniscule amount of Freon in the upper atmosphere is due to vulcanoes and escapes from aircraft.

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break down into chlorine, then which of these two is causing the majority of the breakdown of ozone?

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articles on environment-related topics, as well as to ensure that environment articles are properly

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relatively small amount that could be supplied by an infrared photon with a wavelength of 1170 nm.

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Just removed the geocities stuff. Not a valid source. Find a peer reviewed source or leave it out.

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CI, you are correct. Please revert Barwicks version to the one before it... see the discusssion at

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ozone deflection is when the particles from the sun deflect off of the layers of the atmoshpere.

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This article was the subject of a Wiki Education Foundation-supported course assignment, between

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With that worry in mind I looked up the enthalphy of formation of 2 O from O2. This is given at

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along with the fact that we apparently made do without suntan lotion for many thousands of years.

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before doing mass systematic removals. This message is updated dynamically through the template

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to support your ideas not idle speculation. Anyone can pull numbers out of a hat as you have.--

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universities force that down our throats from the time we're born, what else CAN we believe?)

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https://web.archive.org/web/20171121051325/http://www.ozonelayer.noaa.gov/science/basics.htm

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I'd like to see more details (numbers) on what happens in the ozone layer. Specifically:

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and related subjects on Knowledge. To participate, help improve this article or visit the

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1: There isn't a lot of air above the ozone layer ... and it's very thin. Looking at the

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wrong, or perhaps I'm misinterpreting its relation to which photons break which bonds.

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https://atct.anl.gov/Thermochemical%20Data/version%201.118/species/?species_number=551

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If you found an error with any archives or the URLs themselves, you can fix them with

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If you found an error with any archives or the URLs themselves, you can fix them with

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Because its the dominant scientific opinion supported by a large amount of research.

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which lists it, and where this talk should be. Or read the 2002 ozone assessment:

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No, you're just making this up. There is plenty of research, and its cited in the

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http://stsclimate.soc.ku.dk/papers/grundmannclimatechangeandknowledgepolitics.pdf

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The article's main image caption has a misspelling: "Earht" instead of "Earth".

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And the exact opposite to your claims is posted in another scientific article:

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No, there is plenty of evidence, what you mean is you haven't read it. Go to

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Gave it a few days, no-one cares. Removing the graph, as the easiest fix.

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http://yly-mac.gps.caltech.edu/N2O/Prasad/Matsumi_O3_cr0205255%20copy.pdf

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https://www.epa.gov/ozone-pollution-and-your-patients-health/what-ozone

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The ban against CFC in aerosol spray came in to force 1st January 1989.

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http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/earthozone.shtml

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therefore Joe Smith must be a witch who's putting curses on our ozone"

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An editor has reviewed this edit and fixed any errors that were found.

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why is no one paying attention to the hole in the ozone layer anymore?

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http://www.wmo.ch/web/arep/reports/ozone_2002/05_executive_summary.pdf

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Care to explain how the current "ozone depletion" isn't VERY POV also?

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Three, make you see sense, Four, keep reverting your nonsense. Sigh.

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observes the formation rate of ozone is limited by the UV energy. (

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Currently (as of 2007), CFC is regulated under a newer ordinance

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who made measurements in the artic winter of 2000 and found that

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article, which is where you should be having this conversation.

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When you have finished reviewing my changes, please set the

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especially chlorofluorocarbons (CFCs)" isn't VERY POV also?

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if you find errors, please contact me, I will improve it.--

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And that is a made-up answer. He probably misspelled ozone

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what is ozone deflection? where does this name comes from?

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Wiki Education assignment: Introduction to Policy Analysis

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for additional information. I made the following changes:

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for additional information. I made the following changes:

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apparatus. In fact, documentation available at the source

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Thanks! Keep watching though... I doubt we're finished...

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in what products CFC's and bromofluorocarbons are present

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in our earth ozon layer is more edfdfected to people

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Knowledge level-5 vital articles in Physical sciences

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for example. Yet according to the second table here

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why is it not as much of an issue as global warming?

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http://www.geocities.com/northstarzone/index.html#top

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Ozone depletion#Misconceptions about ozone depletion

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Sweden the first to ban aerosols? January 23, 1978?

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The lifetime of HCFCs in the 174: 8: 2751:High-importance General meteorology articles 1891:http://faqs.cs.uu.nl/na-dir/ozone-depletion/ 1445:Because Gore wouldn't get a Nobel for that 1048:http://www.sepp.org/ozone/ozonefranklin.html 2716:C-Class vital articles in Physical sciences 790:where he has spammed the same nonsense in. 403:Knowledge:WikiProject Guild of Copy Editors 2596:Semi-protected edit request on 10 May 2024 2305: 2193:I have just modified one external link on 2165: 2002:I have just modified one external link on 1944: 1399: 422: 406:Template:WikiProject Guild of Copy Editors 354: 227: 2761:Knowledge former articles for improvement 1969:you should add a nice picture like that: 1893:. Nor is the term used in this article. 1343:(as still sold in developing countries). 1328:State of regulation on bromofluorocarbons 1194:Would it make sense to merge the page on 904: 1235:Does UV have some unusual affinity for O 619:on 20 May 2013 for a period of one week. 2569:2A00:23C7:FE12:2A01:706A:F812:D18B:B8BA 424: 356: 285:to improve Knowledge's coverage of the 229: 188: 2581:Kj NV by yytddf Ryu Bucyrus in g HD d 2502:Update sources for Ozone introduction? 2330:Missing UV term in the Sources section 2186:External links modified (January 2018) 2037:to let others know (documentation at 639:enough to produce a lot more ozone ? 7: 2746:C-Class General meteorology articles 2726:High-importance Environment articles 2454:Any 5 main points about ozone layer 753:This page needs substantive revision 476:This article is within the scope of 1915:UV and unexposed life forms in seas 1299:Please somebody explain this to me. 218:It is of interest to the following 23:for discussing improvements to the 2483: 2479: 2394:https://hal.inria.fr/hal-02344142/ 1855:(gases and liquids are fluids). - 1642:Is there any proof of this claim? 582:the General meteorology task force 14: 2437:2409:4043:2E85:5B24:0:0:178B:6B14 2197:. Please take a moment to review 2101:contribution to the AFI project. 2006:. Please take a moment to review 613:This article was selected as the 317:Knowledge:WikiProject Environment 2741:High-importance Weather articles 2696:Knowledge level-5 vital articles 2652: 2603: 2486:. Further details are available 2473: 2048: 606: 463: 453: 426: 376: 358: 320:Template:WikiProject Environment 262: 252: 231: 198: 189: 45:Click here to start a new topic. 2018:Corrected formatting/usage for 1459:) 15:17, 12 December 2007 (UTC) 626:Questions about the ozone layer 557:This article has been rated as 337:This article has been rated as 2706:C-Class level-5 vital articles 2147:16:11, 13 September 2017 (UTC) 1565:05:49, 27 September 2008 (UTC) 862: 409:Guild of Copy Editors articles 307:and leave any messages at the 1: 2426:18:40, 20 December 2021 (UTC) 2406:05:29, 10 December 2019 (UTC) 2116:I find this weird as well. -- 1844:19:16, 4 September 2010 (UTC) 1822:18:41, 4 September 2010 (UTC) 1616:21:59, 27 February 2009 (UTC) 1600:18:22, 27 February 2009 (UTC) 1514:13:40, 8 September 2008 (UTC) 1180:16:20, 28 February 2006 (UTC) 1162:23:08, 27 February 2006 (UTC) 1136:22:56, 27 February 2006 (UTC) 579:This article is supported by 537:Knowledge:WikiProject Weather 42:Put new text under old text. 2756:WikiProject Weather articles 2721:C-Class Environment articles 2383:19:36, 5 December 2019 (UTC) 2324:15:09, 22 January 2018 (UTC) 2291:21:39, 21 January 2018 (UTC) 1930:16:30, 16 October 2012 (UTC) 1580:question about the depletion 1439:19:10, 25 October 2007 (UTC) 1429:18:48, 25 October 2007 (UTC) 1121:22:38, 7 November 2005 (UTC) 1085:16:40, 7 November 2005 (UTC) 1059:10:00, 6 November 2005 (UTC) 1029:16:59, 5 November 2005 (UTC) 1010:16:18, 5 November 2005 (UTC) 1000:16:04, 5 November 2005 (UTC) 980:16:09, 5 November 2005 (UTC) 957:15:53, 5 November 2005 (UTC) 946:15:44, 5 November 2005 (UTC) 921:15:46, 5 November 2005 (UTC) 820:15:44, 5 November 2005 (UTC) 807:14:33, 5 November 2005 (UTC) 795:09:59, 5 November 2005 (UTC) 727:20:33, 28 October 2009 (UTC) 540:Template:WikiProject Weather 2626:to reactivate your request. 2614:has been answered. Set the 2445:05:26, 9 January 2022 (UTC) 2180:20:55, 6 January 2018 (UTC) 1571:ozone layer in stratosphere 1414:20:45, 6 January 2018 (UTC) 706:06:49, 2 October 2008 (UTC) 50:New to Knowledge? 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Please provide some 575: 289:. The aim is to write 75:avoid personal attacks 2530:A few more critiques: 2490:. Student editor(s): 1975: 1606:CFC's are well mixed 1190:Chapman mechanism etc 574: 400:Guild of Copy Editors 394:Guild of Copy Editors 366:Guild of Copy Editors 205:level-5 vital article 100:Neutral point of view 2235:regular verification 1836:William M. Connolley 1747:seems to indicate a 1608:William M. Connolley 1358:Talk:Ozone depletion 1319:William M. Connolley 1133:William M. Connolley 1056:William M. Connolley 1026:William M. Connolley 997:William M. Connolley 943:William M. Connolley 918:William M. Connolley 844:William M. Connolley 817:William M. Connolley 792:William M. 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