mostly made of nitrogen gas & oxygen gas gases that absorb and re-emit infrared radiation water...
TRANSCRIPT
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Greenhouse Gases & Human Activity
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Composition of the Atmosphere
Mostly made of nitrogen gas & oxygen gas
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Greenhouse Gases
Gases that absorb and re-emit infrared radiation Water vapour Carbon dioxide Methane Nitrous oxide Ozone CFCs
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Greenhouse Gases
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Sources vs. Sinks Source: adds greenhouse gases to
the atmosphere
Sink: absorbs greenhouse gases from the atmosphere
Natural or caused by human activities
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Water Vapour – Sources & Sinks
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Carbon Dioxide – Sources & Sinks
Natural sources include volcanic eruptions & cellular respiration
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Methane – Sources & Sinks
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Nitrous Oxide – Sources & Sinks
Produced naturally by nitrogen-fixing bacteria
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Ozone Ozone (O3) is located in the
stratosphere & makes up the ozone layer which blocks harmful UV radiation
Ozone hole in Antarctic
Ground-level ozone forms smog
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CFCs Leading cause of ozone depletion in
the ozone layer
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Anthropogenic Greenhouse Effect
Human activities have significantly increased levels of greenhouse gases since 1750
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Anthropogenic Greenhouse Effect
Increase in global average temperatures
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Global Warming Potential (GWP)
Ability of a substance to warm the atmosphere by absorbing thermal energy
The contribution of a particular gas to global warming depends on:• the concentration of the gas in the
atmosphere• the ability of the gas to absorb heat• the length of time the gas remains in the
atmosphere
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Global Warming Potential (GWP)
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Sources of GHG Emissions in Canada
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Sources of Personal GHG Emissions in Canada
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Homework Read page 331 Complete Gizmo on Greenhouse
Effect Page 332 #3, 4, 8