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# 2-Energy.ppt

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# 2-Energy.ppt

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### 2-Energy.ppt

1. 1. The Energy Cycle (Reading AK Chapter-2) Transferring Energy in the Atmosphere Conduction: Requires Touching Convection: Hot Air Rises Temperature Advection: Horizontal Movement of Air Latent Heating: Changing the Phase of Water Adiabatic Cooling and Warming: Expanding and Compressing Air Diabatic Cooling and Warming: Adding and Subtracting Heat Radiative Heat Transfer: Exchanging Energy with Space Sun and Seasons Radiative Properties of the Atmosphere Global Energy Budget
2. 2. Simple C to F conversion: F = ( TempC + TempC ) –10% +32 Example: 30deg C 86 F = (30degC + 30DegC ) – 6 + 32 C = 5 / 9 * (F – 32 ) F = (9 / 5 * C) + 32 K = 273.16 + C No Atmosphere Facing the Sun (121degC) ((250F) No Atmosphere Shadow and darkness (-157degC) (-250F) Mars 218K Venus 457o C (855o F) Temperature --Definition – A measure of the average kinetic energy of all particles within a sample. HEAT – Energy produced by motions of molecules and is the total kinetic energy of a sample.
3. 3. Energy Transfer The transfer of energy between two objects due to a difference in temperature is called HEAT energy. Methods of Heat transfer include Conduction, Convection, Advection, and Radiation Adiabatic heating/cooling are constant entropy processes and have no transfer of heat
4. 4. Transferring Energy in the Atmosphere -Conduction Requires Touching (land/ sea - air) -Convection Vertical Movement--Hot Air Rises -Temperature Advection Horizontal Movement -Latent Heating Phase Change of Water (Diabatic) -Adiabatic (heating-cooling) Expanding - Compressing -Radiative Heat Transfer With Space
6. 6. Surface and Air Temperature D. L. Walters Cook an egg on sidewalk
7. 7. Hot Enough to Fry an Egg Need a surface air temperature (2m) warmer than 35º C ~ 95 º F • Egg white begins to coagulate at 62°C (144°F) while yolk begins to coagulate at 65°C (149°F). Note: This will take a few minutes
8. 8. Midday Air Temperature-Desert D. L. Walters 15 min
9. 9. -Conduction -Convection -Temperature Advection -Latent Heating -Adiabatic (heating-cooling) -Radiative Heat Transfer 1km Vis at 1 min interval from GOES-8 7204vis.avi http://www.shodor.org/metweb/
10. 10. Measured Versus Calculated Variables TEMPERATURE ADVECTION 5 10 15 COLD WARM CO LD AD V WA RM AD V 500 mb 1000 mb