EES 108 Class 03

EES 108 Class 03 - Outline Temperature...

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Outline Temperature  changes over time  (Seasons): § Changing solar  declination changes  intensity of sunlight Beam spreading Beam depletion § Changing solar  declination changes  length of day Energy, Heat, and  Temperature § Forms of energy § Mechanisms of heat  flow § Focus on radiative  heat flow: Laws of radiation
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Cause of seasons Changing zenith angle: 1. Beam spreading (most important) 2. Length of day 3. Atmospheric depletion Smaller zenith angle = more heat Zenith angle changes with §. Declination §. Latitude Climate determined primarily by latitude and  season
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Animations\Tutorials\Solar_Position.html
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Seasons Terms: § Rotation: Spinning on axis (day/night) § Revolution: Orbiting sun (summer/winter) § Perihelion/Aphelion  Difference in distance ~1.7% Difference in brightness ~3.4%  § Inclination of axis = 23.5°
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Animations\Tutorials\Tilt_Solar_Declination.html
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Definitions Solar declination: § Latitude at which sun is directly  overhead at noon § Varies between  -23.5° and + 23.5° § (+ for North, - for South) Zenith angle: § Angle between sun at noon and a  point directly overhead § Zenith =  latitude - declination Solar elevation angle § Angle between sun and horizon  at noon § Elevation = 90° - Zenith
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June 21 Declination = +23.5° (North) Distance in degrees to 20°S = 20 + 23.5 = 43.5 Solar angle = 90° − 43.5° = 46.5° Distance in degrees to 50°N = 50 − 23.5 = 26.5
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EES 108 Class 03 - Outline Temperature...

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