GC170 1st Edition Lecture 6 Outline of Last 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 lawsi. ExplanationsOutline of Current Lecture I. Radiation Lawsa. Inverse-Square Lawb. Planck Functionc. Wien’s Lawd. The Stefan-Boltzman LawII. Atmospheric Structurea. Four LayersThese 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. Troposphereii. Stratosphere iii. Mesosphereiv. ThermosphereIII. Greenhouse effectIV. Heat Transfera. Conductionb. Convectionc. RadiationCurrent LectureI. Radiation Lawsa. Inverse-Square Lawb. Planck Function i. Relates intensity of radiation to the wavelengths emitted by a blackbodyc. Wien’s Lawi. Maximum radiation flux (peak)d. The Stefan-Boltzman Lawi. Total energy and temperature ii. Proportional to the body’s temperatureiii. Total energy equals the energy emitted along all wavelengths iv. E=oT4e. As the temperature increases, the shorter the wavelength becomesII. Atmospheric Structurea. Four layersi. Troposphere (0-10km)1. Temperature decreases with altitude2. Ex: Mt. Lemmon3. Warm at bottom cold at top 4. Most of the greenhouse gases are concentrated 5. Decreasing temperature6. Composition: a. Nitrogen (78%), Oxygen (21%), Argon (0.9%), Water Vapor, Carbon Dioxidei. CO2 and H2O are greenhouse gasesii. Stratosphere1. Ozone Layer2. Increasing temperatureiii. Mesosphere1. Decreasing temperatureiv. Thermosphere 1. Increasing temperatureb. Temperature varies with heightIII. The Greenhouse Effecta. Earth absorbs solar shortwavesb. Earth emits longwave radiationc. Longwaves absorbed by greenhouse gasesd. Greenhouse gases re-emits energye. Lower atmosphere is heatedIV. Heat Transfera. Thermal energy (heat)= microscopic movement of molecules in a substancei. Molecules have kinetic energy which is what is converted to heatii. The warmer the substance, the faster the molecules moveb. Conductioni. Direct contact between two thingsii. Heat goes from a warmer object to a cooler objectc. Convectioni. Movement within a fluid, gases or liquidsd. Radiationi. Electromagnetic wavesii. Electromagnetic energy is not heat energy, it becomes heat when it is absorbed by the object and sets the molecules in motioniii. Ex: barbecue grill e. Heat causes expansion of a substancef. The troposphere is very unstable (weather occurs in this layer)i. IR radiated off the earths surface (heating from below)ii. Air is warmed and expandsiii. Becomes less dense and risesiv. Cooler air sinks and replaces
View Full Document
Unlocking...