the hole in the ozone layer
DESCRIPTION
Presentation on the effects of the ozone hole, its discovery and other details.TRANSCRIPT
The Hole
THEIR DISOVERY, LOCATION, AND THE
PROBLEMS THEY CAUSE
In the Ozone layer
By Amrik Sadhra
What, oh what, is the Ozone layer?
Composed of O3
Protects Life on earth
Located Close to Earth Between 6 and 10
miles above the Earth's surface and extends up
to about 30 miles.
Stops damaging wavelengthsCausing mutations in DNA
Keeps UV outActs as a barrier against
UV radiation.
Contains relatively high concentrations of Ozone
(Trioxygen)
Where, oh where, is the Ozone Layer?
The Atmosphere Has layers
Ogres have layers.
Ozone is found in the lower portion of the
stratosphere
When, oh when, was the hole discovered?
Scientists discovered that since the mid 1970s ozone values over Halley and Faraday research stations had been steadily dropping when the sun reappeared each spring.
Scientists from British Antarctic Survey began monitoring ozone during the International Geophysical Year of 1957–58.
The Discoverers
Joesph Farman , Brian Gardiner, and Jonathan Shanklin
How was the hole discovered?
Balloon goes up,Results come
down.
Where are the holes?
Many were worried that ozone holes might start to appear over other areas of the globe but the only other large-scale depletion is a small ozone “dimple” observed during the Arctic spring over the North Pole.
Really just Antarctica.(But sometimes it spreads)
Why Antarctica?
Chemical reactions on polar stratospheric clouds (PSCs) in the
cold Antarctic stratosphere caused a massive, though localized and
seasonal, increase in the amount of chlorine present in active, ozone-
destroying forms.
These clouds are only formed when there are very low temperatures, as low as −80 °C. In such conditions
the ice crystals of the cloud provide a suitable surface for conversion of unreactive chlorine compounds into reactive chlorine compounds, which
can deplete ozone easily.
Problems the hole causes
Biological
Allows damaging UV wavelengthsThrough Earths atmosphere
Problems the hole causes
Environmental
UV kills many crops by destroying the bacteria thatRetain nitrogen on the roots of many plants
Phytoplankton form the foundation of aquatic food webs, and production of them is negatively
impacted by UV light
UV radiation has been found to cause damage to the early developmental stages of fish,
shrimp, crab, amphibians and other animals