2 S6E4.a Demonstrate that land and water absorb and lose heat at different rates and explain the resulting effects on weather patterns.Describe what happens to solar energy that reaches EarthSummarize the processes of radiation, thermal conduction, and convectionExplain the relationship between the greenhouse effect and global warming
3 Energy in the Atmosphere Earth and it’s atmosphere are warmed by energy from the sun.We are going to discuss the three ways that this happens: radiation, conduction, and convection.
4 Radiation: Energy Transfer by Waves Radiation is the transfer of energy as electromagnetic wavesRadiation is how energy from the sun reaches Earth.Energy from the Sun is absorbed by the atmosphere, land, and water and converted into thermal energyThe earth receives only about 2 Billionths of the energy radiated by the sun.0.0000_The order after the decimal is tenths, hundredths, thousandths, millionths, billionths.
6 Radiation: Energy Transfer by Waves Ex. Sun’s rays traveling through space to Earth.0.0000_The order after the decimal is tenths, hundredths, thousandths, millionths, billionths.
7 Conduction: Energy Transfer by Contact Thermal Conduction is the transfer of thermal energy through a material by direct contactThermal energy is always transferred from warm to cold areasWhen air molecules come into Direct Contact with the warm surface of earth, thermal energy is transferred to the atmosphere.
8 Conduction: Energy Transfer by Contact In what ways have you experienced conduction?
11 Convection: Energy Transfer by Circulation convection is the transfer of thermal energy by the circulation or movement of a liquid or gasMOST thermal energy in the atmosphere is transferred by convection
12 Convection: Energy Transfer by Circulation Circulation of hot & cold air:As air is heated it becomes less dense and risesCool air is denser so it sinksas the cool air sinks it pushes the warm air up.This cycle of warm air rising and cool air sinking causes a circular movement of air called a convection Current
16 Greenhouse Effect70% of the solar radiation which enters Earth’s atmosphere is absorbed by the clouds and Earth’s surface.Likewise, the Earth’s surface re-radiates thermal energy. Most of this thermal energy is absorbed by gases in the atmosphere and radiated back to Earth’s surface instead of into space.
17 Greenhouse Effect What is the greenhouse effect? the warming of the surface and lower atmosphere of Earth that occurs when water vapor, carbon dioxide, and other gases absorb and reradiate thermal energy.
18 Greenhouse EffectAnd This: Atmosphere acts like glass walls and roof of a greenhouse, allowing solar energy to enter, but prevents thermal energy from escaping.
21 Global WarmingGlobal Warming: a gradual increase in average global temperature due to the increase of greenhouse gases in the atmosphere that absorb thermal energyWhat has increased the greenhouse gases?1. Increased use of fossil fuels= more carbon dioxide in air2. Deforestation-=less trees= morecarbon dioxide in airAdd carbon dioxide molecules to the air in your drawing.