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16 Cards in this Set
- Front
- Back
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cause of ozone hole
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CFC emissions
chlorine= product of CFCs breaking up |
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reservoir species of Cl
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HCl
ClONO2 |
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active species of Cl
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Cl
ClO (go thru catalytic cycle- destroy lots of ozone) |
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polar vortex
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circular wind around Antarctica in stratosphere in winter
-traps air over polar region via IR radiation -keeps ozone rich air out |
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Antarctic spring
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100x more catalysts to destroy ozone (Molina Cycle)
-converts reservoir to active species |
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polar stratospheric clouds
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only form in cold weather
chemical reaction takes place on them converting reservoir to active Cl |
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size of O3 hole depends on...
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size of polar vortex (usually several thousand miles)
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sequence of events
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1. Vortex forms
2. Cools down 3. PSC’s convert res to active 4. Active species destroy ozone 5. Polar vortex breaks up |
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UVA
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Penetrates atmos at full intensity
No sunburn- skin cancer, tanning booths |
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UVB
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Very harmful, most absorbed in ozone layer
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UVC
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Completely absorbed in atmos
Used to sterilize water- dangerous |
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Health effects of uv radiation
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Accelerate skin aging
Skin cancer- damage DNA |
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Montreal protocol
London amendments Copenhagen amendments |
Reduce then eliminate cfc emission
Global TOC reached turning point, Recovering |
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CFC's
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organic mols in which H atoms completely replaced by fluorine, chlorine (artificial)
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peak in ozone concentration (stratosphere)
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25 km
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wavelengths that ozone absorbs
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UV and IR
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