Energy transfer 15.2
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Energy transfer 15.2

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Energy transfer 15.2 Energy transfer 15.2 Presentation Transcript

  • CH. 15-2 Energy Transfer in the Atmosphere
  • Energy from the Sun  The Sun provides most of the energy on Earth.  Three things happen when Earth receives the energy:  Some is reflected back into space by clouds, atmospheric particles, & Earth’s surface.
  • Energy from the Sun  Some energy is absorbed by the atmosphere  The rest is absorbed by land and water on Earth’s surface.
  • Energy from the Sun  About 35% is reflected back into space.  6% by the atmosphere  4% by Earth’s surface  25% by clouds
  • Energy from the Sun  The other 65% is absorbed.  15% by the atmosphere  50% directly or indirectly by Earth’s surface
  • Heat  Heat energy flows from warm to cold.  Heat energy is absorbed by roads, rocks, water, & soil.  Heat is transferred through the atmosphere in 3 ways:
  • Heat  Radiation  Conduction  Convection
  • Radiation  Radiation – Energy from the sun transferred in the form of waves or rays.  You feel the radiation when the Sun warms your face or skin.
  • Conduction  Conduction – the transfer of energy that occurs when molecules bump into one another.  In other words, one object comes into contact with another….
  • Conduction  Energy will travel from the warmer object to the cooler object.  Earth’s surface conducts energy to the atmosphere by air moving over warm land.
  • Convection  Convection – is the transfer of heat by the flow of material.  Convection circulates heat throughout the atmosphere. How?
  • Convection  As air is warmed it becomes less dense & rises.  Cooler air moves in to replace the warm air.
  • Water Cycle  Hydrosphere – all the water on Earth’s surface.  Evaporation – when water changes from a liquid to gas.  Condensation – when water changes from a gas to a liquid.
  • Water Cycle  Water evaporates from oceans, lakes & streams AND transpiration from plants  The water vapor (gas) condensates forming clouds.  The water in clouds falls to Earth as precipitation