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by: Isett Notetaker

GY 101 WEEK 4 NOTES GY 101-002

Isett Notetaker

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These notes cover everything discussed in class
Atmospheric Processes and Patterns
Douglas Sherman
Class Notes
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Popular in Atmospheric Processes and Patterns

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This 4 page Class Notes was uploaded by Isett Notetaker on Monday September 19, 2016. The Class Notes belongs to GY 101-002 at University of Alabama - Tuscaloosa taught by Douglas Sherman in Fall 2016. Since its upload, it has received 8 views. For similar materials see Atmospheric Processes and Patterns in Geography at University of Alabama - Tuscaloosa.


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Date Created: 09/19/16
GY 101 WEEK 4 9/13 Radiation Balance and Thermal Properties of Surfaces Reflected near Surface • Reflected (albedo) ◦ reradiated as Shortwave (k ^) • Absorbed ◦ reradiated as Longwave (L ^) Scattering (seeing colors) • when you see color what you’re seeing is the wave lengths radiation, where all colors are being absorbed expect the one you see which is being reflected • Rayleigh scattering gives the atmosphere its blue color Absorption (pg. 57) • red; radiation at sea level • yellow; sunlight at top of the atmosphere • black line; blackbody spectrum • black absorbs all colors • white reflects all colors Radiation Balance Equation (do not need to memorize) • energy neither created nor destroyed ! Q*= (K (down) - K (^)) + (L (down) - L (^)) • Q* is net radiation • K is a short wave (sun) • L is a longwave (earth) • if Q* is not 0, warming or cooling must occur The “Greenhouse” (pg. 63) Thermal Properties of Surfaces • albedo • conductivity • specific heat • “mixing” Conductivity • air ◦ k = 0.025 • water ◦ k = 0.6 • Ice ◦ k = 2.0 • Wood ◦ k = 0.04 - 0.4 • Soil ◦ k = 1.5 • Rock ◦ k = 1.7 • Sand (dry) ◦ k = 0.2 • Sand (wet) ◦ k = 0.25 - 2.0 Specific Heat (J/gK) • air ◦ c = 1.0 • water ◦ c = 4.2 • Ice ◦ c = 2.1 • Wood ◦ c = 2.5 • Soil ◦ c = 1.0 • Rock ◦ c = 0.8 • Sand (dry) ◦ c = 0.8 • Sand (wet) ◦ c = 0.8 - 2.0 “Mixing" • degree to which insolation and/or heat is spread vertically • water, high • ice, low • soil/sand, low • vegetation, medium 9/15 Global “Sufaces" • water • sand (relatively high albedo) Thermal Properties of Surface • cause differential heating of the earth’s surface • cause temperature gradients, thus pressure gradients • drive wind systems across a number of scales Effects of Fluid Density on Flow • for unconfined air. density changes with temperature (Ideal Gas Law) • Temperature (T) up, density decrease (p) • Temperature (T) down, density increase (p) • Air pressure changes with density • Air wil flow to equalize pressure W= warm C= cold H= high pressure L= low pressure Small-Scale Circulation Concepts get graphs from sav The Distribution of Pressure • Pressure maps depict isobars, or lines of equal pressure. • Pressure gradients depict the rate of change in pressure. They are apparent on maps by the spacing between the isobars. • Winds are driven from H to L The Coriolis Force • objects in the atmosphere are influenced by Earth rotation


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