ATM OCN (Meteorology) 100
ATMOSPHERIC ENERGETICS (continued):
Lecture # 4-B Scheduled for:
17 JUN 2004 (R)
Recommended Readings from Moran (2002):
Today's Lecture Objectives:
- To identify the electromagnetic spectrum and to describe how the various forms of electromagnetic radiation differ from one another.
- To state in your own words the basic electromagnetic radiation laws describing the amount and spectral character of the emitted radiation.
- To distinguish between solar radiation and the radiation emitted by the earth-atmosphere system.
- To distinguish between scattering, reflection, absorption and transmission.
- To explain how the radiant flux emitted from a point source diminishes with the inverse square of the distance and to evaluate the variation of flux for various planets at known distances from the sun.
- To give a suitable definition for the solar constant and provide a currently accepted value of the solar constant.
- To describe the basic motions of the earth in space, explaining the existence of the diurnal and seasonal cycles and identifying the approximate dates of the solstices, the equinoxes, perihelion and aphelion.
- To sketch the essential features of the solar illumination geometry (in terms of solar altitude and daylight length) for various locations on earth at the solstices and equinoxes.
- To explain how solar altitude influences the intensity of solar radiation received at the earth's surface.
- To define albedo, explain its significance and list the factors that cause variations in the albedo of an object.
- To explain why the atmosphere is heated chiefly by terrestrial radiation.
- To explain the atmospheric effect ("greenhouse effect") and identify the gases chiefly responsible for this effect.
- To summarize the cause and possible effects of stratospheric ozone depletion.
B. RADIANT ENERGY or ELECTROMAGNETIC RADIATION
- The nature of electromagnetic radiation
- Wave forms
- Terminology describing waves
- The electromagnetic spectrum
- Important relationships of radiation
- Ideal radiators/absorbers ("black bodies")
- The ideal radiator curve
- Total amount of energy emitted/absorbed
- Region of maximum radiation
- Inverse-square relationship
- Angle of incident radiation ("cosine law")
C. THE EARTH, THE SUN and THE RADIATION LINK
- The Sun and Solar radiation
- Our place in the sun -- Annual and diurnal motions of Planet Earth
- Disposition of solar radiation in the Earth-atmosphere
- Terrestrial radiation
Links to Other References:
Additional information can be found on the Internet through the following sites:
Produced by Edward J. Hopkins, Ph.D.
Department of Atmospheric and Oceanic Sciences
University of Wisconsin-Madison Madison, WI 53706
Latest revision: 21 June 2004 (2340 UTC)