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Stratospheric ozone depletion

Contents:

Page 1 ­ Title page.
Page 2 ­ Incoming insolation, introduction, and the different wavelengths of UV.
Page 3 ­ How much UV reaches the Earths surface, and stratospheric ozone.
Page 4 ­ The effects of UVB on living organisms, and the depletion of stratospheric ozone.…

Page 2

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Incoming insolation



Introduction
Light (solar insolation) is affected by latitude, cloud cover, seasonal and daily changes.

The Sun emits electromagnetic radiation across most of the electromagnetic spectrum.
Although the Sun produces Gamma rays as a result of the nuclear fusion process, these
super high energy photons are converted to lower…

Page 3

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How much UV reaches the Earth's surface
The levels of UV radiation reaching the Earth's surface vary. This is due to factors such as the
time of day, the time of year, latitude, altitude and the weather. No UV C reaches the Earth
as it is absorbed by the ozone…

Page 4

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Effects of UVB on living organisms
Effects on humans:

o Sunburn

o Skin cancers

o Premature ageing of the skin

o Cataracts (can lead to blindness)

Effects on plants:

o Photosynthesis decreases

o Plant height and leaf area decrease

The negative effects of UVB on plant growth could lead to…

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Where did CFCs come from?

Most CFCs have been released to the atmosphere through the use of aerosols containing
them and as leakages from refrigeration equipment. Other releases occur from industry.

How do they break down ozone?

Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they…

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The hole in the ozone layer
There has been a steady decline in ozone of 4% per decade in total volume since the late
1970's.




The hole formed over Antarctica as there are stratospheric cloud and ice particles here that
are not present in the stratosphere in the warmer regions.…

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Replacement materials, methods or processes
There isn't a way to replace stratospheric ozone other than the natural way that it forms so
after all CFC emissions have stopped then it should recover naturally. However there are
ways ozone can be created for industrial uses (water purification, and in the preparation…

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