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UNC-Chapel Hill GEOG 111 - Energy Transfer

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GEOG 111 1st Edition Lecture 6 Outline of Last Lecture I. Earth-Sun Geometrya. Rotationb. Revolutionc. Tilted axisd. Solar declinatione. Solar elevationf. Solar insolation Outline of Current Lecture I. Energy Transfera. Radiation transferb. Heat transferc. Energy imbalances and energy transferCurrent LectureI. Energy Transfer- through radiation and heat transfers (Q*= net radiation)a. Radiation transfer- the net amount of radiation availablei. Local radiation budget: Q*=K incoming – K outgoing + L incoming –L outgoingii. K: shortwave, L: longwaveiii. If Q* > 0 net energy gain and temperature risesIf Q* < 0 net energy loss and temperature fallsIf Q* = 0 radiation balance and no temperature changeiv. Factors that control the values of the equation1. Incoming shortwave- seasonal/diurnal cycle, clouds, particulates2. Outgoing shortwave- albedo (light colored surfaces will reflect the incoming light)3. Incoming longwave- coming from the atmosphere, greenhouse gases (the more, the higher the temperature), clouds4. Outgoing longwave- reflected back to the atmosphereThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.v. How does local radiation budget plot change if the following conditions are observed?1. Cloudy skies- Q* isn’t going to be nearly as high and the temperature isn’t going to be as high; the day’s temperature range isn’t as big; clouds are very effective in absorbing longwave radiation2. Dry conditions (low concentration of water vapor in the atmosphere)- 3. Snow cover- snow is a very effective emitter; slightly cooler conditions atnight because waves are emitted back to the atmosphere Q*> 0Q*< 0Q*<


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