A post by Watts:
At AGU, NASA says CFC reduction is not shrinking the ozone hole – yet
Sheesh! Another instance of quack science layered on top of a bogus hypothesis, sprinkled with predictions of doom and destruction
James Ard says:
James Ard says:
The ozone hole hoax was good practice for becoming a climate skeptic. All of the same ingredients; media hype, end of the world predictions and a boogieman that actually benefited mankind.
--------------
The data from NASA gives these plots
http://ozonewatch.gsfc.nasa.gov/meteorology/annual_data.html
Minimum ozone is measured in Doson Units (DU):
One Dobson Unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere (the air pressure at the surface of the Earth). Expressed another way, a column of air with an ozone concentration of 1 Dobson Unit would contain about 2.69x1016ozone molecules for every square centimeter of area at the base of the column. Over the Earth’s surface, the ozone layer’s average thickness is about 300 Dobson Units or a layer that is 3 millimeters thick.
Of course this data only covers 33 years so the cycle maniacs could always claim it's just natural.
But it is interesting to note that the loss of ozone stabilises a few years after the Montreal Protocol was passed in 1987.
And from the NASA quote
"Until chlorine levels in the lower stratosphere decline below the early 1990s level – expected sometime after 2015 but likely by 2030 – temperature and winds will continue to dictate the variable area of the hole in any given year. Not until after the mid 2030s will the decline stratospheric chlorine be the primary factor in the decline of ozone hole area."
The same NASA website also has observations from a few Antarctica station and these go back to 1950s showing no sign of hole before 1975
--------------
The data from NASA gives these plots
http://ozonewatch.gsfc.nasa.gov/meteorology/annual_data.html
Minimum ozone is measured in Doson Units (DU):
One Dobson Unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere (the air pressure at the surface of the Earth). Expressed another way, a column of air with an ozone concentration of 1 Dobson Unit would contain about 2.69x1016ozone molecules for every square centimeter of area at the base of the column. Over the Earth’s surface, the ozone layer’s average thickness is about 300 Dobson Units or a layer that is 3 millimeters thick.
Of course this data only covers 33 years so the cycle maniacs could always claim it's just natural.
But it is interesting to note that the loss of ozone stabilises a few years after the Montreal Protocol was passed in 1987.
And from the NASA quote
"Until chlorine levels in the lower stratosphere decline below the early 1990s level – expected sometime after 2015 but likely by 2030 – temperature and winds will continue to dictate the variable area of the hole in any given year. Not until after the mid 2030s will the decline stratospheric chlorine be the primary factor in the decline of ozone hole area."
The same NASA website also has observations from a few Antarctica station and these go back to 1950s showing no sign of hole before 1975
