global warming annie, asher, nathan. ● greenhouse gases: composition is changing ● increases...
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Global WarmingAnnie, Asher, Nathan
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● Greenhouse gases: composition is changing
● Increases solar flare activity: sun radiation goes through cycle
● Cyclical changes in the Earth’s orbit: elliptical → circular → elliptical
● Volcanic Activity: Release greenhouse gases
Possible Models
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● Enhancement of the greenhouse effect is caused by human activities
Enhanced Greenhouse Effect
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● Although debatable, the generally accepted view of most scientists is that human activities, mainly related to burning of fossil fuels, have released extra CO2 into the atmosphere
Combustion of Fossil Fuels
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● Vostok Ice Core drilling o atmospheric compositiono global temperatures
Global Warming & Greenhouse Gases
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● Reduction of ice/snow cover ● Temperature increase ● Deforestation
Mechanisms
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● V0=original volume● ΔV=volume change● ΔT=temp. change● B=coefficient of volume
expansion >10^-4 per degrees Celsius
Coefficient of Volume Expansion
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What all of that represents:
The coefficient of volume expansion is the fractional change in volume per degree change in temperature.
Coefficient of Volume Expansion
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● Natural reasons for rise in sea-level● Enhanced greenhouse effect● Difficult to predict precisely:
o anomalous expansion of watero ice melting on sea versus on land
Rise of mean sea-level
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● Outcome of the enhanced greenhouse effect
Climate Change
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● Volume Expansion: dV=BV0dT● Heat Capacity: Q=mcdT● Latent Heat: Q=ml
Possible Problems:
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● More efficient power production.● Natural gas.● Combined heating/power.● Renewable/nuclear power.● CO2 capture/storage.● Hybrid vehicles.
Climate Change Solutions
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http://ibphysicsguide.weebly.com/86-global-warming.html
http://caphysicshl2011.wikispaces.com/8.6.1+Models+of+Warming
Sources