Chap 15, Sect 2 (Atmospheric Heating) Objectives: Please copy in your IAN! Describe and show an example of conduction, convection, and radiation. Explain the relationship between the greenhouse effect and global warming. https://www.youtube.com/watch?v=I6jIMkPwahQ

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 1) Electromagnetic waves.

Weather Factors 2) 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. 3) Radiation: 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. 4) Conduction: direct contact/ transfer of heat from one substance to another.

Have 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. 5) Convection: The transfer of heat by the movement of fluid or air. Hot air rises, cold air sinks. Basement colder than upstairs Transfer of energy by circulation. Convection

Bell Ringer: Please takeout the picture to the right from your blue tub and glue it in your IAN under your atmospheric heating notes from last week. Take out the half sheet and test your knowledge. Use your textbook to help if needed, 15.2 Glue Me!

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 Put them all together: http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/70523.htm

Bonfire Example Radiation keeps you away. Smoke and flames are carried away by convection. Ground beneath the fire gets hot by conduction.

Eactivity: How does this work in our atmosphere?

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 and Life on Earth As you have learned, about 70% of the radiation that enters Earth’s atmosphere is absorbed by clouds and by the Earth’s surface. This energy is converted into thermal energy that warms the planet. 6) The greenhouse effect: is Earth’s natural heating process. Increasing levels of greenhouse gases could cause global warming.

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

Did you know? Because Venus is closer to the sun, it gets more thermal energy. Ordinary light can penetrate the weak atmosphere and hit it’s surface. The surface heats, just like our planet and radiates heat back into the atmosphere. Its surface becomes up to 460degrees C – hot enough to melt lead. This trapping of heat in the atmosphere is called the greenhouse effect on Venus, too.

Greenhouse Effect! Objectives: Discover/Illustrate/Communicate what the greenhouse effect is, including how gases in Earth’s atmosphere act like a giant greenhouse to create the effect on a global scale. Research why the greenhouse effect is important to keeping us alive on Earth! Plus, see how the greenhouse effect relates to global warming, and do we need to prevent a global meltdown! 

AC: Global Warming PBL Problem: Is Global Warming real? Is it a natural event or man made? OR is it natural and people are making it worse?   1. Research: Find at least three sources for your information. Go to my blog and click on the websites that have been preapproved. Also, you can use the science book or reputable magazines and newspapers. Try to use scientific sites, not political. 2. Try to answer the following questions: A. What is global warming? B. What is causing it? (10 pieces of data for man-made, 10 for natural) C. What will be the results for each argument (ocean levels, animal/plant life)? 3. Be able to say where you got your information/ cite your evidence. List the information at the bottom of your IAN research chart. Compare your notes on Friday. 4. Communicate/Debate: Friday you will be assigned one point of view to take in class. Be prepared to debate for either side. Different points of view= different solutions! 5. Revise your beliefs: Pick any point of view you agree with most after our debate and write a 5-6 sentence persuasive paragraph with at least 5 math/science facts to support your argument!!! Try to use a couple of new facts you learned from your classmates. 6. Solution/ Innovation: Your conclusion needs to argue 2 ways we can stop this from happening now or in the future.

Greenhouse Effect Basics Gases absorb the heat and act as a “blanket” to keep Earth warm. Some greenhouse gases: water, methane, carbon dioxide. The gases function like the glass walls and roof of a greenhouse, which allow solar energy to enter but prevent thermal energy from escaping. Greenhouse Effect Basics

http://my. hrw. com/sh2/sh07_10/student/flash/visual_concepts/80242 http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80242.htm

Runaway Greenhouse Effect: Global Warming? Many scientists have become concerned about data that show that average global temperatures have increased in the past 100 years. 7) global warming: an increase in average global temperatures.  Some scientists have hypothesized that an increase of greenhouse gases in the atmosphere may be the cause of this warming trend. Greenhouse gases absorb thermal energy in the atmosphere = higher temps, not convection

Runaway Greenhouse Effect In your IAN, please copy!

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 greenhouse gases in the atmosphere https://www3.epa.gov/climatechange/kids/index.html VS.

Global Warming Causes Natural: Volcanoes Solar flares Cycle Orbit Cows https://app.discoveryeducation.com/learn/videos/2E2EB8C5-65C5-4825-BAE9-4D5C2C283F43?hasLocalHost=false Forest fires Methane release in the arctic tundra

Manmade Causes: Industry Deforestation Cars Fossil fuels Wars Let’s Review! Heat/AC BrainPop Greenhouse Arms race Nuclear waste Coal burning Electricity Land fills Acid rain

What’s Next? You Decide! Question: Is Global Warming real? Is it a natural event or man made? Is it natural and people are making it worse? Global Warming Brainpop Bill Nye debate

Define and Design Due Friday! Explain research on 2 different points of view for Global Warming. 10 facts each. Try to answer the following questions: A. What is it? B. What is causing it? C. What will change (ocean levels, animal/plant life)? Due Friday!

Links to inform your decision: http://earthobservatory.nasa.gov/Features/GlobalWarming/ http://news.bbc.co.uk/cbbcnews/hi/newsid_1570000/newsid_1575400/1575441.stm http://www.ncdc.noaa.gov/paleo/globalwarming/home.html http://www.enwin.com/kids/conservation/global_warming.cfm http://www.kidcyber.com.au/topics/climatechange.HTM http://dnr.wi.gov/org/caer/ce/eek/earth/air/global.htm

Finish Argument: Persuasive Paragraph Your paragraph must include your opinion on each of the following: what G.W. is, share what side you take (Y/N) and why (research: facts to back up your side), and your conclusion on the argument. *You must include the sources that you used. Use sources that are based in Science not politics! There are scientists on both side of the issue. Due Monday, 2/13

Debate Format: You will be placed into groups of 4-6 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.