GPH 212, Week 6 Notes
GPH 212, Week 6 Notes GPH 212
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This 2 page Class Notes was uploaded by Sheridan Smede on Thursday September 29, 2016. The Class Notes belongs to GPH 212 at Arizona State University taught by Matei Georgescu in Fall 2016. Since its upload, it has received 4 views. For similar materials see Introduction to Meteorology in Physical Geography at Arizona State University.
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Date Created: 09/29/16
Exam Review ● The entire earth system (including the atmosphere) is NOT a valid representation of a blackbody ○ The surface of the earth, however, is a good approximation of a blackbody (very close at least) ● The majority of ultraviolet radiation absorption occurs in the stratosphere ● Temperature conversion: ○ C = 5/9 (F 32) ● No medium is needed to allow radiation ● Forced convection when air moving horizontally runs into an obstacle and needs to move vertically (ex: a mountain) ● Wien’s Law tells us at what wavelength the maximum emission occurs Earth’s Revolution ● If the tilt was 90 degrees, the sun would be on the horizon if you were looking at it from the equator ○ Hemispheres would experience 24 hour periods of darkness ● Summer solstice NH (northern hemisphere) has its max tilt toward the sun (experiences greatest amount of insolation) ● Winter solstice NH has minimum tilt toward sun ● Equinoxes all locations have 12 hours of daylight and nighttime ● During summer solstice when sun’s rays meet surface at a right angle (at 23.5 degrees North), latitude band is called the Tropic of Cancer ● Arctic circle is at 66.5 degrees north ● During solstices: ○ Summer arctic circle has 24 hours of continuous daylight (at north pole) ○ Winter 24 hour of complete darkness at arctic circle (north pole) Receipt of Insolation ● Solar angle ○ Solar radiation is directly related to solar angle ○ Higher solar angles reduce beam spreading, which leads to warming ○ Lower angles induce less intense warming ■ This is what happens to our planet as it moves around the sun ○ Solar angle impacts amount of atmosphere sunlight must penetrate through ■ The more atmosphere sunlight needs to penetrate through, the less that reaches the surface ● Because of reflection, etc. Calculating Noontime Sun Angle ● Equinoxes: 90 your latitude ● Summer solstice: 90 your latitude + 23.5 ● Winter solstice: 90 your latitude 23.5 ● At equator: period of daylight is always 12 hours Processes ● Absorption ● Scattering ● Transmission
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