And this says what about the "destruction of ozone by cfc's"? You surely aren't saying CFC's don't destroy ozone, right?
No, it is established fact that CFCs contribute to the destruction of ozone. What hasnt been clearly established is that anthropogenic causes account for the Ozone hole. One reason is the Ozone hole is, and has been, an annual event in the Polar Regions, particularly Antarctica, since before anyone bothered to look for it. It is an artifact of the polar winter.
This is completely untrue. The ozone hole is a reasonably recent phenomena. Previous to 1965 it did not exist. So your theory is wrong from the outset.
It also isnt the entire story to simply say that the Ozone layer protects us from UV rays. It is more the result of regular old oxygen protecting us from UV rays. Quote:
Ozone in the earths stratosphere is created by ultraviolet light striking oxygen molecules containing two oxygen atoms (02), splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines with unbroken 02 to create ozone, 03. The ozone molecule is also unstable, although, in the stratosphere, long-lived; and when ultraviolet light hits ozone it splits into a molecule of 02 and an atom of atomic oxygen, a continuing process called the ozone-oxygen cycle, thus creating an ozone layer in the stratosphere.
My point is that if there were no UV rays striking the top of the Earth's atmosphere, then there would be little or no ozone. Ozone is very effective at filtering out some wavelengths of UV radiation, and as long as sunlight is hitting the top of the Earth's atmosphere ozone is continuously generated. As stated, ozone will break down more quickly in the presence of CFC's, as well as methane and other gasses; but ozone itself is a very unstable compound, breaking down quickly even without the presence of those gasses. As long as the sun is shining, however, ozone is always being generated.
Even on Earth there are places where the sun doesnt always shine. When the sun doesnt shine, the reverse effect is true. The Antarctic ozone hole begins to form in the polar winter and reaches its peak in the polar spring. This corresponds to the time frame of the polar winter, when there is no sunlight hitting the upper atmosphere in the Polar Regions. If no sunlight is hitting the upper atmosphere, no ozone is being generated.
Again this is totally untrue. The ozone hole does not form in the winter, it forms when the sun hits the stratosphere (which photochemically disassociates Cl2 to Cl which destroys ozone). The data that you presented demonstrates that ozone depletion does not begin to occur until the beginning of August (which is polar sunrise in the Antarctic stratosphere. If as you propose the ozone hole is caused by darkness it would be peaking in July, right BEFORE polar sunrise.
The ozone returns when the polar vortex breaks down and mid latitude air mixes into the polar stratosphere. Again you theory of the lack of sun causing the ozone hole does not agree at all with the data.Each winter, the air around the South Pole cools and begins circulating to the west. This vortex effectively isolates the air over Antarctica
You are speaking of another phenomenon of the Polar winter known as the polar vortex. This vortex does lead to a closed atmospheric system which tends to isolate the Polar Regions from atmospheric mixing, as you list. However, the connection I am not sure you are making is this. Since the sun is not generating ozone in the Polar Regions during polar winters and ozone is an unstable compound, a hole in the ozone layer forms during polar winter and spring. CFCs, methane and other anthropogenic gasses do accelerate this process, but when spring returns and the Polar Regions begin to receive direct sunlight again, the Ozone hole begins to shrink. If CFCs are destroying the Ozone and causing the Ozone hole, why does the ozone return? Because it is generated by sunlight hitting oxygen in the upper atmosphere. Unless the Sun shuts down, it seems we will always have plenty of ozone.
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To summarize, stratospheric ozone is the result of oxygen protecting us from UV rays; the ozone "hole" is the result of polar winters.
I agree that CFC's could have made the ozone hole worse than it naturally would have been, and therefore it is not intrinsically bad that the use of these chemicals was reduced. But again, I see little to no valid evidence that the hole in the Ozone layer was caused by man. It is another assumed cause and effect argument on the part those on the alarmist side of the question.
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