GC 170 1st Edition Lecture 5Outline of Last Lecture I. Greenhouse gasesA. Definition of greenhouse gasesB. The sunC. Goldilocks principlea. The earth is the perfect location, CO2II. Electromagnetic radiationa. Wavelengthb. Frequencyc. Electromagnetic SpectrumIII. Forms of Energya. Definition of energyb. Potentialc. Kineticd. Thermale. ElectromagneticIV. Fluxa. Definition of FluxOutline of Current Lecture I. Ecological Footprint Assignmenta. Homework explanationII. Carbon footprinta. Why is it important?b. How are we all participating?III. The greenhouse effect?a. When and how is CO2 absorbed?IV. Radiation lawsa. 4 lawsThese 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.i. Explanationsii.Current LectureI. Ecological Footprint assignmenta. Read “What it Measures” and “FAQ” and answer questionsb. We produce carbon in 4 categories (consumption categories):i. Carbon – home energy use and transport ii. Food footprint (land needed to produce our food, absorb CO2 producing food) iii. Housing Footprint (how much space use, how much energy is used to heat/cool homes) iv. Goods and Services – How much land is needed to produce the products we consumec. Do the Ecological Footprint Quiz (2x) d. Print out the results page for both quiz attempts, bring to class with at home assignment II. Carbon Footprinta. Concept of carbon sequestrationi. Ocean and plants take up CO2 from the atmosphere1. Stored in plant and animal matter in the soils and ocean water - therefore CO2 is removed from the atmosphere.2. 16.67 hectares to absorb 1 metric ton of carbon in the atmosphereIII. The Greenhouse Effect:a. Earth absorbs solar shortwavesb. Earth emits longwave radiationc. Longwaves absorbed by greenhouse gasesd. Greenhouse gases re-emits energye. Lower atmosphere is heatedi. Explanation of how the earth gets warm because of the sun that is so far awayIV. Radiationa. The Radiation Laws: i. (With Allowing time look up graphs to show each law, may be more clear)ii. Inverse-Square Law 1. If we double the distance from the source, the intensity of radiation decreases by ¼ for the same unit area2. As the distance from the source increases, the intensity decreases exponentiallyiii. Planck Function Law1. The Planck function relates the intensity of radiation to the wavelength emitted by a blackbody (emits at 100% wavelengths)iv. Wien’s Law 1. A blackbody has a maximum radiation flux, that is inversely related to the temperature of the blackbody.a. The lower the temperature of a body, the longer peak wavelength lower energy flux b. The higher the temperature of a body, the shorter the peak wavelength higher energy fluxc. The higher the temperature the lower the peak wavelengthv. The Stefan-Boltzman Lawb. Why does UV radiation irritate our skin but not infrared radiationi. Shorter Wavelengths (high frequency) transmit more energyc. How does Flux affect our climate?i. More radiation is absorbed at the equator, which makes it warmerV. Definitionsa. Temperature = measure of the internal heat energy of a substancei. Celciusii. Fahrenheit iii. Kelvin (used mostly for global change)b. Blackbody = an hypothetical object that emits (and absorbs) electromagnetic radiation with 100% efficiency at all wavelengthsi. Sun & Earth treated like