CH 18 PP Atmospheric energy

CH 18 PP Atmospheric energy - Energy Balance in the...

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Unformatted text preview: Energy Balance in the Atmosphere Light behaves like a wave and a particle Photons elementary particles of light Travel at 3 x 10 8 meters per second (300,000 km/sec) in a vacuum Electromagnetic radiation light also behave as energy waves, perpendicular electrical and magnetic waves Wavelength distance between wave crests Frequency number of waves passing a point/sec. Electromagnetic spectrum continuum of electromagnetic wavelengths Not to scale! Absorption when something absorbs radiation, the photons energy can initiate chemical and/or physical reactions May cause molecules to vibrate Excited state absorbed photons makes electrons get excited Emission of radiation when the exited electrons settle down they emit light All objects emit some radiation Emission color (wavelength) relates to temperature Earth absorbs high energy short wavelength energy from the sun and then re-emits it as longer wavelength lower energy radiation (IR) Reflection electromagnetic radiation bouncing from a surface Albedo proportional reflectance of a surface (e.g.: a perfect mirror would have an albedo of 100%) Glaciers & snowfields approach 80-90% Clouds 50-55% Pavement and some buildings only 10-15% Scattering gases and water droplets scatter light in all directions short blue wavelengths scatter more than longer wavelengths; so skies are blue The sun appears yellow because white light with most of the blue removed yields yellow Glaciers and snowfields reflect light and cool the earth. The Jeffries Glacier, St Elias Range, Alaska Albedos of common Earth surfaces When radiation scatters, its direction changes but the wavelength remains constant. Iron glows red when heated in a forge. If it is heated further, it emits white light....
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CH 18 PP Atmospheric energy - Energy Balance in the...

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