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ESS102H1 (104)
Lecture 10

Lecture 10

2 Pages
108 Views

Department
Earth Sciences
Course Code
ESS102H1
Professor
Christine Burton

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Glg205 t 10
Concern about environmental issues:
- Personal health
o E.g. lung cancer, eutrophication effects on fish
so what are we doing?
- Sometimes the action is fast and effective (e.g. CFCs)
- Sometimes the action is not so effective and slow (e.g. global warming)
Policy hurdles
- Ævo]]WZ]vPZ}v[ZÀu}vÇÀoµ
Ozone
- Note when 03 formed in the atmosphere (about 2.5 million years ago)
o Slightly after atmosphere was oxygenated
- Note how 03 forms in the atmosphere
o Cyanobacteria took in CO2 and produced oxygen
o Sunlight hit the oxygen and broke it up into oxygen radicals
o They combine to form ozone
- Tropshpere ozone is a pollute
o Big component of smog
- Absorption of UV
o Warm air over cold air caps troposphere
Stratospheric ozone balance
- Ozone + UV ->
- Chlorine and nitric oxide combining with ozone to form oxygen
- Chlorine and nitric oxide work as a catalyst for ozone breakdown
Ozone depleting chemicals
- Sunlight breaks apart CFC and freeze the chlorine radical that catalyzes ozone breakdown
Arctic vs Antarctic
- Thinning was not evident in Arctic until recently
- Arctic not as cold as Antarctic
- Less ice crystals in the atmosphere where chlorine rest on to do their work
Antarctic
- Polar vortex t }o]]vZv]vÁu]v[v
o CFCs trapped in the cold air during the whole period
- Evidence of polar vortex
Montreal protocol
- Patents for CFC were running out
o Not making so much money by making CFC
- Scientists were certain what was making the ozone hole
- Industries wanted new patents to make more money
G7 economic summit in Paris
- Development of state of the environment indicators
Earth summit
- Stabilize greenhouse gas emissions
Kyoto
- Montreal protocol was replaced by new patents but now its hard to replace the fossil fuels we
use
- v[µu]]}v](Z}µv[o
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Description
Glg205 J 10 Concern about environmental issues: - Personal health o E.g. lung cancer, eutrophication effects on fish so what are we doing? - Sometimes the action is fast and effective (e.g. CFCs) - Sometimes the action is not so effective and slow (e.g. global warming) Policy hurdles - Lo]]Z9Z]L2ZZ}L[ZK}Lo Ozone - Note when 0 fo3med in the atmosphere (about 2.5 million years ago) o Slightly after atmosphere was oxygenated - Note how 0 forms in the atmosphere 3 o Cyanobacteria took in CO a2d produced oxygen o Sunlight hit the oxygen and broke it up into oxygen radicals o They combine to form ozone - Tropshpere ozone is a pollute o Big component of smog - Absorption of UV o Warm air over cold air caps troposphere Stratospheric ozone balance - Ozone + UV -> - Chlorine and nitric oxide combining with ozone to form oxygen - Chlorine and nitric oxide work as a catalyst for ozone breakdown Ozone depletin
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