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GY 101 - Sept 13

by: Savannah L

GY 101 - Sept 13 GY 101

Savannah L
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About this Document

Lecture notes from Tuesday, September 13, 2016
Atmospheric Proc & Patterns
Professor Douglas Sherman
Class Notes




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This 2 page Class Notes was uploaded by Savannah L on Tuesday September 13, 2016. The Class Notes belongs to GY 101 at University of Alabama - Tuscaloosa taught by Professor Douglas Sherman in Fall 2016. Since its upload, it has received 97 views. For similar materials see Atmospheric Proc & Patterns in Geography at University of Alabama - Tuscaloosa.


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Date Created: 09/13/16
GY 101 –SEPT 13 LECTURE – RADIATION BALANCE AND THERMAL PROPERTIES OF SURFACES -Radiation near surface:  Reflected (albedo) o Reradiated as shortwave  Absorbed o Reradiated as longwave -Rayleigh scattering gives the atmosphere it’s blue color  Black absorbs all colors  White reflects all colors -Radiation Balance Equation  Energy neither created nor destroyed Q* = (K down – K up) + (L down – L up) NOTE: does not have to be memorized o Q* is net radiation o K is shortwave (sun) o L is longwave (earth)  If Q* does NOT equalzero, warming or cooling must be occurring -Water vapor is extremely efficient at absorbing radiation (considered singlemost important greenhouse gas) Earth’s Energy Budget: NOTE: Doesnot have to be memorized, understand concept Incoming solar energy – 100% o Reflected by atmosphere – 6% o Reflected by clouds – 20% o Reflected from earth’s surface – 4% o Absorbed by atmosphere –16% o Absorbed by clouds – 3% o Absorbed by land and oceans –51%  Radiated to space from cloudsand atmosphere –64%  Radiated directly to space from earth – 6%  Carried to clouds and atmosphere bylatent heat in water vapor – 23%  Conduction and rising air –7% (NOTE: ATNIGHT, ALL K DOWN STOPS, THEONLYRADIATION ATNIGHT IS THERERADIATION FROM THE LAND. THIS ISWHY LAND CONTINUOUSLYCOOLSOVERNIGHT—This means the coolest time of the day is right before sunrise) Thermal properties of Surfaces: NOTE: Numbers/values do not have to be directly memorized  Albedo o Snow 75-90% o Clouds 50-80% o Ocean 3-70% o Dry Sand 35-45% o Soil 5-35% o Vegetation 5-35%  Conductivity (W/mk) o Air: k = 0.025 o Water k = 0.6 o Ice k = 2.0 o Wood k = 0.04-0.4 o Soil k = 1.5 o Rock k = 1.7 o Sand (dry) k = 0.2 o Sand (wet) k = 0.25-2.0  The higher (k) the harder it is to heat up the source (ex. Dry sand is easier to heat than ice would be)  Specific Heat (J/Gk) o Air c = 1.0 o Water c = 4.2 o Ice c = 2.1 o Wood c = 2.5 o Soil c = 1.0 o Rock c = 0.8 o Sand (dry) c = 0.8 o Sand (wet) c = 0.8-2.0  (c) = joules  “Mixing” - Degree to which insolation and/or heat is spreadvertically o Water High o Ice Low o Soil/sand Low o Vegetation Medium DIAGRAMS FROM TEXT TO NOTE:  Absorption (page 57 of text)  The “Greenhouse” (page63 of text)  Earth’s Energy Budget (unknown)


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