Lecture7_EAS1600_Fall08 - EAS 1600 Introduction to...

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Unformatted text preview: EAS 1600 Introduction to Environmental Sciences Solar Radiation Earth Sun Relationships and Effective Temperature In the previous lecture we covered some important concepts about radiation Energy depends inversely on wavelength Intensity of radiation from a point source obeys an inverse square law The intensity of solar radiation reaching the Earths surface depends on the angle of the sunglight (S=S o cos(q)) All objects with T > 0 K emit radiation or black body radtiation. S= s T 4 , max ( m) = 2898/T eff Today we look at two important aspects of the Earth Sun system Seasons and Earth/Sun relationships and Effective Temperature Earths Orbit About the Sun The Earth rotates about its axis as it orbits or revolves around the sun. The angle between the rotational axis and the orbital plane is ~ 23.5. This is what gives us the seasons. The Earths axis runs from the North to the South Pole. The yellow dot above is the N.P. Earth Sun relationship during the solstices. Note this is the time of year when you expect to the largest differences in temperature as a function of latitude. Diagrams of Earth Sun relationships are taken from http://www.physicalgeography.net/ There are Three Reasons why this Tilt Causes Cold Winters and Warm Summers...
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This note was uploaded on 02/08/2011 for the course EAS 1600 taught by Professor Jimstjohn during the Fall '08 term at Georgia Institute of Technology.

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Lecture7_EAS1600_Fall08 - EAS 1600 Introduction to...

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