Lab 2_Climate 1

Lab 2_Climate 1 - THE PHYSICAL ENVIRONMENT LABS GEOG 211...

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1 THE PHYSICAL ENVIRONMENT LABS – GEOG 211 Lab 2: RADIATION, CLIMATE CHANGE The purpose of this lab is to introduce some of the factors that control the amount of energy at the earth’s surface. The lab contains three parts. The first part includes a brief look at what factors affect the amount of radiation coming from the sun and other energy relationships. The second part focuses on how to calculate net radiation budget for the earth and interpret the various components of the radiation budget. The radiation budget is important as it determines the net radiation at a particular location which is used to power the earth’s biosphere. The third part of the lab looks at changes in the earth’s atmosphere, and resulting impacts on climate. Objectives: Become familiar with factors that control the amount of energy at the earth’s surface Introduce simple energy relationships Learn how to calculate radiation budgets and interpret the components Investigate impacts of human industrialism on the CO2 levels in the atmosphere Skills developed: Data interpretation Graph interpretation Unit conversion Application of simple models Background reading: References / Sources: Part C modified from the following website: http://cs.clark.edu/~mac/physlets/GlobalPollution/carbon_dioxide.htm Strahler and Strahler 1992.
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2 PART 1: SOLAR RADIATION AND TEMPERATURE Figure 1: The electromagnetic spectum. Modified from Strahler and Strahler (1992) What is the range of wavelengths for radar waves? ___________________________ The wavelength range for visible light as illustrated on the diagram is 0.3 μm to 1.0 μm. Convert this range from microns to centimeters. Show your calculations.
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3 Figure 2: Emission spectra for the sun and earth. Modified from Strahler and Strahler (1992) Question: What is the wavelength of maximum intensity of a black body having a mean temperature of: a) 50,000 ° C _________________ b) 280 K _________________ c) -40 ° F _________________ ° C = 5/9( ° F-32 ° ) K = 273 ° + ° C Wein’s Law wavelength of maximum intensity (μm) = 2900º . º K ( absolute temp )
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4 PART 2: RADIATION BUDGETS K : incoming shortwave radiation (from the sun) K : reflected shortwave radiation (fraction of the K is reflected back to atmosphere) L : incoming longwave radiation (emitted by atmosphere) L : outgoing longwave radiation (emitted by earth’s surface) Q*: Net radiation Q* is the net value of all the radiation components. It can be negative (energy loss) or positive (energy gain). It is calculated by the equation:
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Lab 2_Climate 1 - THE PHYSICAL ENVIRONMENT LABS GEOG 211...

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