Chap 15, Sect 2 (Atmospheric Heating)

Objectives: Please copy in your IAN!

1. Describe and show an example of conduction, convection, and radiation.

(glue and paste from blue tub)

2. Explain the relationship between the greenhouse effect and global warming.

15.2 Atmospheric Heating

You are lying in a park with your eyes closed, and you feel the warmth of the sun on your face.

Did you ever realize that it takes a little more than 8 minutes for the energy to travel to your face from a star 149,000,000 km away?

Weather Factors

Sun’s energy travels to earth as Electromagnetic waves.

Weather Factors

Scattering: Reflections of light in all directions.

Why is the sky blue? (videoclip) http://app.discoveryeducation.com/player/view/assetGuid/6BFFC6FF-2E83-41D6-9B51-1653D5BE0386

Radiation

Ever feel the heat of the sun on your face or the heat from standing by a campfire? That is radiation.

It is the direct transfer of energy by electromagnetic waves.

Conduction

Have you walked barefoot on the sand at the beach and the sand burned your feet? That is conduction.

It is the direct contact/ transfer of heat from one substance to another.

ConvectionHave you ever come inside with wet shoes on and your mother told you to put them over the heating vent to dry? How does this dry them even though the actual furnace is in the attic? That is convection.

The transfer of heat by the movement of fluid or air. Hot air rises, cold air sinks.Basement colder than upstairsTransfer of energy by circulation.

Examples

Cooking on the stove-pot on burner

Hot air balloon rising

Fireplace warming a room

Curling iron on hair

Blow dryer on hair

Air from furnace heating the house

Bonfire Example

Radiation keeps you away.

Smoke and flame are carried away by convection.

Ground beneath the fire gets hot by conduction.

How is Earth heated?Light/heat from the sun RADIATES through the atmosphere, hits the Earth where it is absorbed.This heats the air above it by CONDUCTION.This heat rises up to the greenhouse gases where it is trapped, cools, sinks and heats at the surface again.-CONVECTION.Think about it: Why does 70 degrees in Spring feel colder than 70 degrees in Fall?

Weather Factors

In Summary:

Energy from the sun is the driving force behind the water cycle, which contributes to create Earth’s weather.

Radiation is transfer by electromagnetic waves. Thermal conduction is energy transfer by direct contact. Convection is energy transfer by circulation.

The greenhouse effect is Earth’s natural heating process. Increasing levels of greenhouse gases could cause global warming.

Greenhouse Effect

These gases absorb the heat and act as a “blanket” to keep Earth warm.

Some greenhouse gases: water, methane, carbon dioxide.

Runaway Greenhouse Effect

Runaway Greenhouse Effect

http://www.epa.gov/climatechange/kids/index.html

http://www.bing.com/videos/search?q=bill+nye+global+warming&qs=n&form=QBVR&pq=bill+nye+global+warming&sc=8-23&sp=-1&sk=#view=detail&mid=B709AB17CAFE760B2441B709AB17CAFE760B2441

The Greenhouse Effect

Global Warming

gases (CO2 and water vapor) absorb thermal energy and radiate it back to Earth a process that reminds us of an actual greenhouse

an increase in average global temperatures

an increase in greenhouse gases in the atmosphere

VS.

Global Warming Causes

Natural:Volcanoes

Solar flares

Flatulence

Cycle

Orbit

Snow

Poop

Cows

Forest fires

Methane release in the arctic tundra

Manmade Causes:Industry

Deforestation

Cars

Fossil fuels

Hairspray

Wars

Blow dryers

Heat/AC

Hot water

Arms race

Nuclear waste

Coal burning

Electricity

Land fills

Acid rain

Define and Design

Explain 2 different points of view for the Greenhouse Effect. Due =1/16 & 1/18

This is a lab grade: 4 labs = 30%

Other upcoming dates?– Ch. 15 Quist 1 = 2/24– Ch.16/17 Quest 2 = 3/6– Tech Term Final = 4/2

Debate Format:•You will be placed into groups of 4 to compare notes and information. • You will then be told which side you are arguing.•The floor will be opened for speaking 1 at a time.•You may “respectfully disagree” with each other once the speaker has finished. •Remember, if you get really loud, it is a sign of weakness.

Debate Tips:•Be polite and courteous.•Listen attentively•Be respectful and supportive of peers. •Avoid inappropriate noises.•Speak only when recognized by the moderator.•Allow others to express their opinions; do not monopolize the debate.•Use grammatically correct language.•Speak clearly, slowly, and loud enough to be heard by the audience.•Speak with passion and excitement.