Transfer of heat energy

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This presentation describes the processes affecting the movement of insolation of energy through the atmosphere and how energy from the Sun is absorbed by the Earth.

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Transfer of heat energy

  1. 1. What Happens to Insolation? Intro to Physical Geography
  2. 2. Energy Basics Energy Pathways and Principles  Shortwave energy in from the Sun (ultraviolet, visible light, and near-infrared)  Longwave energy out from Earth (thermal infrared) Transmission  The passage of energy through atmosphere or water Insolation input  All radiation received at Earth’s surface – direct and indirect
  3. 3. What happens to insolation? Scattering (diffuse radiation)  Changing direction of light’s movement, without altering its wavelengths  Rayleigh scattering makes our skies look blue
  4. 4. WavelengthsBecause blue lighthas a shorterwavelength itscatters more easily.Image from Wavelength image fromhttp://missionscience.nasa.gov/ems/09_visible Universe by Freedmanlight.html and Kaufmann.
  5. 5. What Happens to Insolation? Refraction  Change in speed and direction of light as insolation travels from space through the atmosphere  Examples: Rainbows and mirages
  6. 6. What happens to insolation? Some energy is reflected without being absorbed  So we need to think about albedo (how reflective a surface is)  Clouds and aerosols have unpredictable albedos What types of surfaces are most reflective? What types of surfaces absorb more energy?
  7. 7. Albedo Values
  8. 8. Clouds and Albedo Bottom images from http://earthobservatory.nasa.go v/Features/Clouds/clouds4.php
  9. 9. Changes in albedo
  10. 10. What happens to energy that reaches the surface? Absorption – the assimilation of radiation by molecules of matter and conversion to different kinds of energy.• Heat is energy produced by the motion of atoms and molecules.• Heat flows from a region of higher temperature to a region of colder temperature, but not the other way around.• Four types of heat transfer: • conduction, convection, advection, and radiation.
  11. 11. Methods of Heat Transfer
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