GEO 211 1st Edition Lecture 7 Outline of Last Lecture I. Radiation and TemperatureA. Radiation lawsB. Radiation of Sun and EarthC. Incoming solar radiationD. Atmosphere interferes with it by1. Absorption2. Scattering3. ReflectionOutline of Current Lecture II. Radiation and Temperature continuedA. AbsorptionB. ScatteringC. Reflection and albedoD. Absorption by selected gases of the atmospherea. Selective absorbersb. shaded areasc. strong absorbers of infrared, outgoing radiationd. Strong absorbers of incoming short wave radiationE. Greenhouse effect: “warming Earth’s surface”a. Main greenhouse gasesb. Less greenhouse gasesCurrent LectureII. Radiation and Temperature continuedA. Absorption- 19% absorbed by our atmosphere and clouds- 51% absorbed at Earth’s surface- Absorbed radiation is converted through heat energy- Heat energy- wavelength is changed to a larger oneB. Scattering- deflection of radiation from its path into different directions (without These 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.altering its wavelengths)- Downward component of scattered radiation is diffuse radiationC. Reflection and albedo- Albedo- reflective quality of the surface- Reflection- portion of arriving radiation that bounces back to space- Wavelength is not altered in the process- Lighter colored surfaces reflex more energy (ex: snow on top of a mountain)- Dark colored surfaces reflect less energy (lower albedo)- Earth’s albedo= 30%D. Absorption by selected gases of the atmospherea. Selective absorbers1. Nitrous oxide2. Methane3. Oxygen and ozone4. Water vapor5. Carbon dioxideb. Shaded areas- represent percentage of radiation absorbed by different gasesc. Strong absorbers of infrared, outgoing radiation1. Carbon dioxide2. Water vapor- Atmosphere is transparent to incoming solar radiation between 0.3 and 0.7µm (visible region)- Atmosphere is transparent to outgoing terrestrial radiation between 8-11µm (atmospheric window)d. Strong absorbers of incoming short wave radiation1. Ozone2. OxygenE. Greenhouse effect: “warming Earth’s surface”a. Main greenhouse gases1. Carbon dioxide2. Water vaporb. Less greenhouse gases1. Nitrous oxide2. Methane3.
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