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Global Warming (Gases and Particles (Well-mixed GHGs
CO2 (CO2 increases
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Global Warming
Earth's Energy Budget
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Energy Budget Equation
Earth's energy budget relies on 3 variables:
- Insolation
- Albedo
- Emissivity
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Changes by latitude
- Higher latitudes radiate back more heat than they absorb
- Lower latitudes radiate back less heat than they absorb
Gases and Particles
CO2 increases
Concentrations of CO2 have been increasing since the start of the industrial revolution (around the 1750's)
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Feedback of CO2
Increasing CO2 warms the atmosphere, which allows it to hold more water vapor, which in turn warms the atmosphere even more
Methane increases
Concentrations of methane have been increasing since the humans started emitting it
Similar timing
All of the increases in these well-mixed GHGs began at the same time, indicating that humans are responsible
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Aerosols
- Black carbon
- Sulfate Aerosols
Sulfate Aerosols Production
- Volcanic eruptions
- Burning fossil fuels
Sulfate Aerosols Effect
- Reflection of insolation (net cooling effect)
- Creation of fog and clouds, due to charged status
Sulfur Aerosols Regulation
- Decreasing with time, due to air pollutant status
Black Carbon Production
- Natural biomass burning
- Coal and diesel engines
Black Carbon Effect
- Absorbs insolation (net warming effect)
Direct Aerosol Forcing
- Net cooling effect across all, but some can be warming (like black carbon)
Aerosol Regulation
- Helping to improve air quality, but may actually increase warming
What determines if a gas is guilty?
- Concentration
- Lifetime
- Radiative efficiency
Concentration
- Water Vapor
- CO2
- Methane
- N2O
- O3
- CFCs
Lifetime
- CFCs (10,000s of years)
- N2O (100)
- CO2 (100)
- Methane (12)
- Ozone (hrs - days)
Radiative Efficiency
- CFCs
- N2O
- Methane
- CO2
- Ozone
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