EES 108 Class 05

# EES 108 Class 05 - Energy flow in the Atmosphere Convection...

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Surface/Atmosphere interactions Heat leaves surface by Radiation (longwave) Conduction Transfer of sensible  “laminar boundary layer” This layer is only a few  millimeters thick! Greatest transfer of heat  from surface is latent heat  of evaporating water Heat moves through  atmosphere by Radiation Convection Sensible Heat Transfer of heat changes  temperature Latent Heat Transfer of heat without  changing temperature Evaporation/Condensation

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Energy flow in the Atmosphere
Convection Free convection:

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Forced convection

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Convection and lapse rates Negative lapse rate: Inversion Los Angeles, 1950s Positive lapse rate: Convection Malaysia, 1997
Radiative transfer of heat

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Laws of Radiation 1. All objects continually radiate energy 2. Hotter objects are brighter Radiate more energy per second per unit area 3. Hotter objects radiate shorter wavelengths  (bluer) 4. Objects that are good absorbers are also good  emitters Black objects emit most Transparent objects emit least

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Two laws of blackbody radiation Blackbody radiation: Radiation emitted by hot, perfectly black object. Wien displacement law   (Wilhelm Wien, 1864-1928) : Tells us  color  of blackbody radiation T K   μm   2900 max = λ Exercise:  Roughly, what is dominant wavelength emitted by sun (T  = 6000 K)?  Roughly, what is dominant wavelength emitted by earth  (T = 288 K)?
Answers Exercise:  Roughly, what is dominant wavelength emitted by  sun (T = 6000 K)?  Roughly, what is dominant wavelength emitted by

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## This note was uploaded on 04/09/2008 for the course HIST 101 taught by Professor Guliver during the Spring '08 term at Vanderbilt.

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EES 108 Class 05 - Energy flow in the Atmosphere Convection...

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