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Greenhouse effect and global warming

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Greenhouse effect and global warming. Consequences and solutions of global warming. Global sulfur cycle and acid rain ... Reflect sunlight and cause cooling ... – PowerPoint PPT presentation

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Title: Greenhouse effect and global warming


1
Lecture 3
  • Greenhouse effect and global warming
  • Consequences and solutions of global warming
  • Global sulfur cycle and acid rain

2
For a gas molecule to absorb IR radiation
  • Its vibrational frequency (????) must fall within
    the IR region (particularly the thermal IR
    region, 4-50 µm)
  • Its vibrational motion must produce a net change
    in dipole moment (???).

Note that energy transition of vibrational motion
is quantized, so is rotational motion.
3
Molecular vibration for a non-linear molecule
such as H2O
4
Molecular vibration for a linear molecule such as
CO2
Symmetric stretch
Bending 15.0 µm
Asymmetric stretch 4.26 µm
5
Absorption Spectrum of different greenhouse gases
in the thermal IR region
For a photon E h c / ?
6
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13
Malaria Mosquito
14
Katrina 2005
15
Coral Bleaching
16
Aerosol particles(???????? )
  • Mainly from combustion of fossil fuels, e.g.
    carbon particle and sulfate
  • Reflect sunlight and cause cooling
  • Heavily polluted Eastern China has a decrease in
    maximum temperature of 0.6oC per 10 years.

17
Possible solutions
  • Minimizing carbon dioxide emissions by using less
    fossil fuel, using fuel with higher efficiency
    (??) and hydrogen-to-carbon ratio, and imposing
    carbon taxes
  • Use alternative renewable energy sources (????)
    and use energy more efficiently
  • Carbon sequestration (??) injecting CO2 in deep
    oceans or underground iron fertilization
    growing plants so storing carbon in biomass
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