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Lecture 7 - Effective Temperature

Lecture 7 - Effective Temperature - EAS 1600 Introduction...

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EAS 1600 Introduction to Environmental Sciences Lecture 7 Solar Radiation Earth Sun Relationships and Effective Temperature
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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 Earth’s 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 , λ max ( μ m) = 2898/T eff Today we look at two important aspects of the Earth Sun system – Seasons and Earth/Sun relationships and Effective Temperature
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Earth’s 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 Earth’s axis runs from the North to the South Pole. The yellow dot above is the N.P.
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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/
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There are Three Reasons why this Tilt Causes Cold Winters and Warm Summers
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Reason 1 Beam Spreading” – The
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