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23.2 Solar Energy & the Atmosphere

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Katelynn Dorn

on 11 February 2015

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Transcript of 23.2 Solar Energy & the Atmosphere

Radiation
23.2 Solar Energy & the Atmosphere
Reflection
solar energy- 20% absorbed by atmosphere, 30% scattered/reflected, 50% absorbed by Earth's surface
albedo- average reflectivity of Earth (.3), moon (.07)
Greenhouse Effect
atmosphere absorbs radiation
infrared rays- warmth of sun
carbon dioxide absorbs infrared rays very effectively
Variations in Temperature
latitude- direct sun rays
elevation- less gases to trap heat
amount of water vapor
regions near oceans- moderate temperatures
sun is highest in June but summers are hotter in July
similar to noon vs. 2:00 pm
Global Warming from CO2
Conduction and Convection
conduction- transfer of heat from molecule to molecule
air heats when coming into contact with warm surface of Earth
convection- movement of gases or liquids when heated unevenly
pressure differences from convection create winds
Atm. pressure lowers with warm air
Scattering
water molecules and dust reflect rays
the shortest wavelengths are scattered
why does the sunset look red?
energy from sun to earth
visible light spectrum- radiation WE see
different types of radiation differ in their wavelength (electromagnetic spectrum)
short wavelengths from sun are absorbed by atmosphere
infrared waves absorbed in troposphere
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