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The Ozone Hole. Tejas Patel PEP Universität Bremen. Contents. History of Ozone Loss Chemical processes in Ozone depletion Regions of Interest Polar Vortex Ozone hole only at poles??? Anthropogenic Impacts on Ozone hole Health Consequences Summary Referances. History of Ozone Loss.

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the ozone hole

The Ozone Hole

Tejas Patel

PEP

Universität Bremen

contents
Contents

History of Ozone Loss

Chemical processes in Ozone depletion

Regions of Interest

Polar Vortex

Ozone hole only at poles???

Anthropogenic Impacts on Ozone hole

Health Consequences

Summary

Referances

history of ozone loss
History of Ozone Loss

Loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970s by British Antarctic Survey (BAS).

chemical processes in o zone depletion
Chemical processes in Ozone depletion

Chlorine, bromine – from human activities

Chlorine carriers – hydrochloric acid, chlorine nitrate

Other compounds – nitric acid, dinitrogen pent oxide

PSC

Denoxification – slows removal ClO

regions of interest
Regions of Interest

Ref:http://www.solcomhouse.com/akjrctic.gif

vortex explanation
Vortex explanation

Antarctic stratosphere cools

descends closer to the surface

Coriolis effect - sets up strong westerly circulation

temperatures - lower stratosphere cool < -80C  PCS’s

ozone loss over antarctica
Ozone loss over Antarctica

Mostly in the lower stratosphere

persists two months

nearly all the ozone is depleted

area the size of Antarctica

most pronounced in spring/October

monthly averages for october
Monthly averages for October

Ref:http://www.atm.ch.cam.ac.uk/tour/tour_images/oct_ozone.gif

is the ozone loss only in antarctica
Is the ozone loss only in Antarctica?

Arctic – ‘low ozone event’

Arctic atmosphere, as result of the eruption of Mt Pinatubo

European ozone hole - heavily populated northern mid-latitudes (30-60N) – formation smaller, much slower

why is the loss more dramatic at the poles
Why is the loss more dramatic at the poles?
  • Polar vortex – winter polar night
  • Polar stratospheric clouds (-80C)
  • nitric acid trihydrate
  • Chemical reactions
    • occur on surface PSC’s
    • Occur very fast
what do these clouds look like
What do these clouds look like?

http://www.abc.net.au/science/news/img/environment/nacreous020806.jpg

health consequences
Health Consequences
  • Skin cancers, sunburn, eye damage
  • estimated 10 % reduction ozone layer  25 % increase non-melanoma skin cancer -temperate latitudes by 2050
  • Suppress immune system
  • DNA mutation of existing disease bacteria and viruses
summary
Summary
  • Massive Ozone loss is in spring time in Antartic stratosphere due to anthropogenic halogens.
  • Difference between Artic and Antartic stratosphere is temperature.
  • Most of the features of polar ozone depletion is now understood but still number of issues remain to be unsolved.
thank you for being patient
Thank You for being patient !!!!

Questions???

Comments!!!!!!

Suggestions………………

references
References
  • Ref:http://www.solcomhouse.com/akjrctic.gif
  • Ref:http://www.atm.ch.cam.ac.uk/tour/tour_images/oct_ozone.gif
  • www.atm.ch.cam.ac.uk/tour
  • http://ozonewatch.gsfc.nasa.gov/facts/hole.html
  • http://www.theozonehole.com/