The Atmospheric Ozone Layer

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concentrations through the depletion of UV light.

However, the need to measure ozone concentrations from the surface at regular
intervals, led to the development of the Dobson spectrophotometer in the 1960s.
The British Antarctic Survey has the responsibility to routinely monitor
stratospheric ozone levels over the Antarctic stations at Halley Bay (76�S 27�W)
and at Argentine Islands (65�S 64�W). Analysis of ozone measurements in 1984 by
a team led by John Farnam, made the startling discovery that spring values of
total ozone during the 1980-1984 period had fallen dramatically compared to the
earlier period between 1957-73. This decrease had only occurred for about six
weeks in the Southern Hemisphere spring and had begun in the spring of 1979.
This discovery placed the British scientists into the limelight of world
publicity, for it revived a somewhat sagging public interest in the potential
destruction of the stratospheric ozone layer by anthropogenic trace gases,
particularly ...

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ozone concentrations fall. Autumn circulations are the
weakest, with the latitudinal gradient between the poles and the equator
virtually disappearing. Ozone concentrations throughout most of the stratosphere
reach a minimum. As the circumpolar vortex expands for winter, the strength of
circulation increases rapidly, ozone transport from the tropics also increases
strongly, and meridional circulation and variability peak in the winter months.

Anthropogenic influences on the stratospheric ozone layer

Figure 2, establishes the basic natural formation and destruction processes
associated with stratospheric ozone. However, several other gases which have
long lifetimes in the troposphere, ...

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