2. Atmosphere

3. Topic: Atmosphere Topic: Atmosphere  Objectives: –I will know what an atmosphere is –I will know atmospheric composition –I will know how air pressure changes with altitude –I will know the 4 layers of our atmosphere and that these layers are based upon temperature changes

4. Atmosphere  Simply put, an atmosphere is a mixture of gases that surrounds a planet  Below is earth’s thin atmosphere and Mar’s thin Carbon Dioxide rich atmosphere  Our Atmosphere keeps us warm; without it, our planet would be a lot cooler

5. What is an Atmosphere?  A mixture of gases that surrounds a planet

6. Atmosphere Composition  Take a breath!  How much oxygen did you just take in?  What other gases did you inhale?  Every time you breathe, you take in about a 21% oxygen and 79% Nitrogen  Other gases include very small amounts include: argon, water vapor, carbon dioxide, methane, and hydrogen, and smog

7. What Gases make up Earth’s Atmosphere?  Earth atmosphere is made up of: –____ % Nitrogen(N 2 ) –____% Oxygen(O 2 ) – 1% argon, carbon dioxide(CO 2 ), water vapor, hydrogen and methane Answer Bank down 78 21

8. Air Pressure  Gravity keeps our atmosphere and air from drifting out into space  Think of it as the weight of the air pushing down on us  Where do you think air pressure is greatest, at sea level, or high up on the top of a mountian?

9. What is Air Pressure?  The weight of the air in the atmosphere pressing ____ on the Earth Answer Bank down 78 21

10. What are the 4 layers of our atmosphere? Troposphere- 0-10 km high, contains our weather and 75% of our air (air pressure is greatest) Temperatures decrease Stratosphere- 10- 50 km high, Contains Ozone layer, Absorbs UV radiation, Temperatures increase Mesosphere- 50- 85 km high, Temperatures decrease Meteors burn up Thermosphere- 85km up to space Temperatures increase, Space shuttle exists here

11. Summarize:  Earth’s atmosphere is divided up into layers that are based upon their _______  The ____ layer is found in the stratosphere  Please draw and fill In the air composition pie graph to the right:  Draw and label the 4 layers of the atmosphere, starting with the bottom layer and working your way up: Answer Bank Mesosphere Ozone Troposphere Temperature Stratosphere Oxygen Thermosphere Nitrogen 1% Other stuff

12. Topic: Atmosphere Topic: Atmosphere  Objectives: –I will know how much radiation form the sun is either absorbed or reflected by our earth –I will understand how the earth’s transfers heat by convection due to the unequal heating between the equator and poles

13. Heat!  We all have a basic understanding of what heat is  If we touch something hot, it has heat!  Ouch!  Radiation is one form of energy, but heat is anther form of energy  Heat always wants to move from something hot, to something cold!

14. Heat  Heat is the energy that flow from an object with a higher temperature to an object with a lower temperature  When an object has no heat, this object is cold  So, when radiation is being absorbed by our earth, it heats up through conduction or convection we heat

15. What is Heat?  Heat is the energy that flows from an object with a ____temperature to an object with a _____temperature  Heat is transferred through conduction and convection Answer Bank Bump equator 30 unequally Higher 50 Flow Ultraviolet weather Lower poles 20

16. Conduction  The surface of the earth absorbs radiation, causing the molecules to rub into one another – Conduction  Conduction is the transfer of energy that occurs when molecules bump into one another  If you have ever walked bare feet on hot asphalt, on a hot summer day you know how hot the surface can get  Your feet heat up because of conduction, that is, hot molecules bump into molecules on your feet  The air above the asphalt is heated in exactly the same way, hot asphalt molecules bump into air molecules transferring heat and energy

17. What is Conduction?  Conduction is the transfer of energy that occurs when molecules ____ into one another

18. Convection  Convection is the transfer of heat by the flow of a heated material  Only occurs with gases and liquids  When gases and liquids are warmed, their molecules move apart, increasing its volume and decreasing its density, causing it to rise  Eventually, gas or liquid will start to cool, causing it to fall back down and the cycle repeats itself

19. What is Convection?  Convection is the transfer of heat by the _____of a heated material such as a gas or liquid Answer Bank Bump equator 30 unequally Higher 50 Flow Ultraviolet weather Lower poles 20

20. Energy in our Atmosphere  Radiation enters our atmosphere from the sun  Radiation is the transfer of energy in the form of electromagnetic waves  Examples include: Radio waves, Microwaves, Infrared, Light, X-Rays, UV, and Gamma waves  Radiation can be harmless or even dangerous

21. What is Radiation?  Radiation is energy in the form of Electromagnetic____  Ex: Radio waves, Infrared, Light, X-rays, _____waves, Answer Bank Bump equator 30 unequally Higher 50 Flow Ultraviolet weather Lower poles 20 waves

22. Solar Radiation  Some solar radiation is reflected by our atmosphere and some is absorbed as heat

23. 100% radiation from the sun 50% radiation Is absorbed by the Surface, land and sea & is converted to heat 20% radiation Is absorbed by the Atmosphere & Clouds & is converted to heat 30% is reflected back into space -10% by clouds & atmosphere -20% by land & sea

24. What happens to incoming solar Radiation from the sun? If 100 % is entering our atmosphere then: –__% is absorbed by land and sea –__% is absorbed by the atmosphere and clouds –__% is reflected back into space by our atmosphere(5%), clouds(20%), and the land sea surface(5%) Answer Bank Bump equator 30 unequally Higher 50 Flow Ultraviolet weather Lower poles 20

25. Unequal Heating  The sun heats up our earth unequally or uneven  Solar radiation is strongest or most intense at the equator  Solar Radiation is weakest and more spread out at the poles  This creates a temperature imbalance—hot equator and cold poles

26. Unequal Heating Flash light demo:

27. Where is Solar Radiation the Strongest? Where is Solar Radiation the Weakest? A B A

28. Heat Transfer  Our earth moves heat from the equator to the poles by means of convection and conduction  As a result, our wind and weather develops Convection

29.  The earth is heated ______ by radiation from the sun  Convection is the transfer of heat from the _____ (warm region) to the ____ (cold region)  Wind and ______develops as a result of this heat transfer How does earth transfer heat from the equator to the poles? Answer Bank Bump equator 30 unequally Higher 50 Flow Ultraviolet weather Lower poles 20

30. 30% is reflected Back into ____ Summary The earth is heated ____The earth is heated ____ As a result, convection transfers heat from the ______ to the_____As a result, convection transfers heat from the ______ to the_____ This drives our ____and weatherThis drives our ____and weather 50% is absorbed By ____ 30% is absorbed By ____ 100% solar radiation from the sun Answer Bank Land & sea Unequally Equator wind Atmosphere & clouds Space poles

31. Topic: Wind systems Topic: Wind systems  Objectives: –I will know the difference between sea and land breezes –I will understand the coriolis effect – I will know the difference between he global wind patterns

32. Daily Winds  Land and Water absorb heat differently  During the day land heats up faster than water through conduction, causing the air above it to rise  Cold air over the ocean fills in, creating a convection current  This creates a wind that flows from the Sea to Land – A sea Breeze

33. Sea Breeze  During the day a sea breeze develops due to Uneven heating of land and water during the day; wind moves from water to land

34. Land Breeze  During the night, the opposite happens, and a land breeze develops due to Uneven heating of land and water; wind moves from water to land

35. What is the difference between a Sea and Land breeze?  a Sea Breeze develops during the _____ due to uneven heating of land and water; wind moves from water to_____  A Land Breeze develops at ____due to uneven heating of land and water; wind moves from land to _____ Answer Bank day Land Uneven sea night

36. Free moving objects move in a straight line move in a straight line Non-Rotating Earth Free moving objects move in a curved line move in a curved line Rotating Earth In the northern hemisphere objects are deflected or curve to the right In the southern hemisphere objects are deflected or curve to the left

37. What is the Coriolis Effect?  The effect created by the ______earth that deflects all free moving objects such as air and water to the ____north of the equator (Northern Hemisphere) and to the ____ south of the equator (Southern Hemisphere) Answer Bank Rises west Left 60 East spinning Equator 30 Right 90

38. Global Wind Patterns  We just learned that earth transfers heat from the equator to the poles by convection  As it turn's out, our earth has predictable wind patterns that form convection cells, moving heat from the equator, all the way to the poles  These are the prevailing wind patterns!

39. Doldrums Hot air rises at the equator Tradewinds Between 0-30°latitude Blow from east to west Westerlies Between 30-60°latitude Blow from west to east Easterlies Between 60-90°latitude Blow from west to east

40. What are the Global winds?  _______ = hot air rises at the equator  _______ = between 0 - 30° blow from east to west  _______ =between 30 - 60° blow from ____ to east  _______ = between 60 - 90° blow from east to west Answer Bank Rises doldrums Left East tradewinds westerlies easterlies

41. Summarize:  Please Draw & label:  A ______develops during the day due to uneven heating of land and water; wind moves from water to_____  A _______develops at night due to uneven heating of land and water; wind moves from land to _____ Answer Bank Sea breeze easterlies Land westerlies Land breeze Uneven tradewinds ????

42. Topic: Atmosphere Issues Topic: Atmosphere Issues  Objectives: –I will know what smog and how it is caused – I will know the current state of our ozone layer –I will understand how our oxygen rich atmosphere formed

43. Smog  Smog is a type of pollutant that affects our atmosphere  What is smog made of?  Generally smog is made up of pollutants from our car exhaust and industry pollution  These are usually unburned hydrocarbons and nitrogen oxides  These pollutants mix with oxygen to and sunlight to create a brown L.A. type of smog

44. Causes of Smog

47. Smog: Getting worse or better?

48. What is Smog? Air pollutants from our ___ exhaust and industry pollutionAir pollutants from our ___ exhaust and industry pollution Answer Bank Car Thinner Ultraviolet photosynthesis

49. Smog and Ozone  Another component of smog is ozone  Ozone is generally considered a beneficial thing because it helps protect us from the sun’s deadly rays  However, ozone should be high in our atmosphere, in the stratosphere  Unfortunately, ozone makes up smog and is very damaging to our lungs and plants

50. Ozone (O 3 ) -- Good or Bad? Bad Ozone is found in smog Which can scar our lungs if we Breathe it Good Ozone is found up high in our atmosphere in the ozone layer Which protects us from the sun’s Harmful UV rays

51. Formation of Stratospheric Ozone

52. Holes in the Ozone Layer  Pollution and a chemical called CFC’s have created holes in the ozone layer  CFC’s are a chemical released from aerosol spray cans  This allows for more ultraviolet (UV) radiation to pass through our atmosphere  As a result skin cancer and other health problems have increased

53. What is the Ozone Layer?  layer made up of 3 oxygen atoms (O 3 ) is protects us from harmful _____ solar radiation (energy)  Pollution and CFC’s have created holes in the ozone layer Answer Bank Car Thinner Ultraviolet photosynthesis

54. Oxygen in our Atmosphere  (O 2 ) Oxygen is produced by Plants and microscopic algae called Phytoplankton  Through Photosynthesis, these organisms release free oxygen into our atmosphere 2.3 billion years ago  Phytoplankton and cynanobacteria released free oxygen into our atmosphere

55. Where does Oxygen in our Atmosphere come from?  (O 2 ) Oxygen is produced by microscopic algae called Phytoplankton and cyanobacteria  Through_____, these organisms release free oxygen into our atmosphere Answer Bank Car Thinner Ultraviolet photosynthesis

56. Summary Answer Bank oxygen 2.3 stratosphere Smog holes  Good ozone is found high up in the ______  Bad ozone is found in ____  ____ in our ozone layer are caused by air pollution  Our _____ rich atmosphere formed ___billion years ago through photosynthesis from phytoplankton and cyanobacteria 2.3 billion years