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Transfer of heat energy
 

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.

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 Transfer of heat energy Presentation Transcript

    • What Happens to Insolation? Intro to Physical Geography
    • 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
    • What happens to insolation? Scattering (diffuse radiation)  Changing direction of light’s movement, without altering its wavelengths  Rayleigh scattering makes our skies look blue
    • 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.
    • What Happens to Insolation? Refraction  Change in speed and direction of light as insolation travels from space through the atmosphere  Examples: Rainbows and mirages
    • 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?
    • Albedo Values
    • Clouds and Albedo Bottom images from http://earthobservatory.nasa.go v/Features/Clouds/clouds4.php
    • Changes in albedo
    • 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.
    • Methods of Heat Transfer