Posted on 01/10/2023 10:20:57 AM PST by Olog-hai
In 1985 the ozone ‘hole’ was ‘discovered.’ Later a natural pattern of increase / decrease was observed. So...for the gazillions of years before 1985, was this oscillation taking place? Did the oscillation take place before the evil SUV first began decimating the landscape? Did the oscillation take place before Jed Clampett discovered oil? Hmmmm?
Is Cuba still on the Human rights committee?
One counter-arguement I have heard regarding CFCs “eating” O3 is that the specific gravity of CFC is too heavy to float up into the upper atmosphwre where the O3 layer is located.
WOW ! the United Nations knows everything ,LOL
2066? Does the UN expect to still be around?
More scientifically illiterate drivel from Seth.
There haven’t been any chlorofluorocarbons introduced into the atmosphere in decades, yet in 2021 the Antarctic ozone hole was according to NOAA “the 13th largest since 1979.” Just to make things interesting, it also found that in 2019, a scant two years earlier, the Antarctic ozone hole “was the smallest since 1982.”
Looks like “weather” to me. Comes and goes.
NASA reported in 2013 that over twenty years after the Montreal Protocol there was no appreciable change in the ozone hole, despite steady natural purging of the HFCs from the atmosphere. The fact is, ozone holes are a natural occurrence which have probably alway been with us, which fluctuate seasonally and with the weather.
This whole “manmade ozone hole crisis” was one of the early fake narratives which set the stage for the granddaddy of all fake narratives.
Boy, do I miss Rush Limbaugh…
CFCs reach the stratosphere because the Earth’s atmosphere is always in motion and mixes the chemicals added into it.
CFC molecules are indeed several times heavier than air. Nevertheless, thousands of measurements from balloons, aircraft, and satellites demonstrate that the CFCs are actually present in the stratosphere. This is because winds and other air motions 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 do not dissolve in water and that are relatively unreactive in the lower atmosphere are mixed relatively quickly and therefore reach the stratosphere regardless of their weight.
Measured changes in the concentration of constituents versus altitude teach us more about the fate of compounds in the atmosphere. 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 heavier than air.
Carbon tetrafluoride is completely unreactive at altitudes up to at least 50 kilometers in the atmosphere. Measurements show it to be nearly uniformly distributed throughout the atmosphere (as illustrated in the figure below, the abundance of CF4 is nearly the same at all altitudes where measurements have been made). There have been measurements over the past two decades of several other completely unreactive gases, both lighter than air (neon) and heavier than air (argon and krypton), that show that they also mix upward through the stratosphere regardless of their weight.
CFC-11 is unreactive in the lower atmosphere (below about 15 kilometers) and is similarly uniformly mixed there, as shown in the figure. However, the abundance of CFC-11 decreases as the gas reaches higher altitudes, because 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 every chlorine atom destroys many thousands of molecules of ozone.
CFCs contain chlorine (or in some cases bromine atoms), and the intense UV in the stratosphere can scission these atoms from the CFC molecules. So the CFCs are simply a delivery vehicle for these chlorine / bromine atoms. We selected these molecules, because they were refractory, hard to start a fire with / in, were largely non-toxic, and they were polar enough they had targeted boiling points that we could use.
The photocatalytic destruction of ozone by these halogens is well documented.
O3 + Cl -> O2 + ClO
ClO + O3 + light -> Cl + 2O2
… and this repeats over and over about a million times per chlorine atom.
Thanks for the chemistry and weather lessons. So did the replacement of CFCs with HCFCs in HVAC systems measureably reduce the presence of Cl in the stratosphere and reduce the rate of destruction of O3?
All hail our globalist leaders then. Bring on the carbon dioxide and methane curbs. Yay!!!!
Can we send non-burning munitions to zelensky? What kind of world will we have left after the war? Thank goodness for vaping.
Yes. The replacement of CFCs with HCFCs in HVAC systems measureably reduce the presence of Cl in the stratosphere and reduce the rate of destruction of O3.
NASA in 2013 also verified that.
The two are not similar.
The linkage between cfc and ozone depletion is and was clear.
For co2 and methane curbs, well it’s not that clear.
And the curbs seem excessive. Women curbs yes. That’s why London is no longer smoggy as it was during Dickens time. But cows farting? Seems to be taking it goo far to me
What is a curb on women?
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