Heating the Atmosphere

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Heating the Atmosphere
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• Temperature the average kinetic energy of the
  molecules in a substance
• Heat energy transferred from one object to
  another due to temperature differences

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Three (3) Methods of heat Transfer

• Conduction
• Convection
• Radiation

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Conduction

• Heat moves when molecules touch each other to
  pass it on.
• Heat flows from the higher temperature matter to
  the lower temperature matter.
• Conduction is important only between Earths
  surface and the air in direct contact with the
  surface.
• For the whole atmosphere, conduction is the least
  important mechanism for heat transfer.

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Convection

• Heat moves by mass movement or circulation within
  a substance.
• For the whole atmosphere, much of the heart
  transfer occurs because of convection.
• Convection occurs in liquids (ocean and air) and
  in pseudo-solids (Earths mantle)

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Radiation

• Heat moves in waves in all directions
• Does not need a substance to move through (unlike
  conduction and convection)

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Four (4) Laws of Radiation

• All objects, at any temperature, emit radiant
  energy
• Hotter objects radiate more total energy per unit
  area than colder objects do.
• The hottest radiating bodies produce the shortest
  wavelengths of maximum radiation
• Objects that are good absorbers of radiation are
  good emitters as well.

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Three (3) results when radiation strikes an
object

• Reflected light materials reflect. Light bounces
  back with the same intensity
• Scattered more light rays with a weaker
  intensity.
• Absorbed dark materials absorb the radiant
  energy and converts into heat

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Greenhouse effect v/s Global Warming

• Greenhouse effect the presence of absorbing
  gases in our atmosphere that make it possible for
  the earth to be inhabited. Occurs naturally.
• Global warming an increase of the temperatures
  in the atmosphere that is caused by human
  activity.

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