1. Prepare yourself to prove your understanding of Solstices, Equinoxes, and Four Spheres
(if you weren’t here yesterday, you won’t be held responsible for the Four Spheres).

2. Label Pages 18 and 19 in your ISNs, “Factors Affecting Climate”
Understand the difference between weather and climate.
Understand how LACEMOPS affect climate

3. What’s the difference?
Weather: the daily condition of the atmosphere which includes temperature and precipitation. (think: weather or not to wear a coat today).
Climate: average weather over an extended period of time.
Precipitation: Moisture that falls from the sky (rain, snow, sleet, hail)

4. Factors Affecting CLimate
Latitude
Air Masses
Continentality
Elevation
Mountain Barriers
Ocean Currents
Pressure and Prevailing Winds
Storms

5. LACEMOPS: Latitude The most important factor.
Low latitude: high temperature.
Middle latitude: temperate
High latitude: low temperature

6. LACEMOPS: Air Masses
Cold air from the polar regions, warm air from the tropics.
Air takes on the characteristics of the land or water it passes over.

7. LACEMOPS: Continentality
Water moderates climate.
Water takes longer to cool/heat than land.
Farther inland = winter & summer extremes.

8. LACEMOPS: Elevation
The higher the elevation, the colder and drier the air.
Think: peaks of mountains have snow.

9. LACEMOPS: Warm Up
Each member of your table pick one of the four factors affecting climate you’ve learned so far (LACE)
On your whiteboard, write a small paragraph explaining that factor as if your audience was a third grader.
Use pictures if you want.
You might be picked to share your answer with the class.

10. LACEMOPS: Mountain Barriers
Mountains stop storms & air masses
Orographic effect:
Windward side gets precipitation.
Leeward side is dry.
Dry side is called a “rain shadow.”

11. Orographic Effect mountain o c e a n VERY cold air Windward side
Leeward side
warm / dry air
cool / wet air
Rain Shadow
#’s 3 and 4 can be explained using this slide and the next slide.
mountain
cool / wet air
desert
o c e a n

12. LACEMOPS: Ocean Currents
Move heat back and forth between the tropics and the polar regions.

14. LACEMOPS: Pressure & Prevailing Winds
High pressure comes from heavy, cold air; low pressure from warm, light air
HILO
Prevailing winds:
Trade winds (EW)
Westerlies (WE)
Doldrums (calm areas around equator)

16. LACEMOPS: Storms
Where cold & hot air masses collide, there are storms.
Where Westerlies meet polar winds, there are storms.
N. Hemi: counter-clockwise
S. Hemi: clockwise

18. LACEMOPS: Storms Types of storms:
Tornadoes: form quickly; relatively small diameter; usually in middle latitudes
Hurricanes: ocean storms that cover large areas and take days to form
Typhoon: hurricanes in the western Pacific Ocean

20. Warm Up: Greenhouse Effect and Global Warming
Title Pages 24 and 25 in your ISN: Greenhouse Effect and Global Warming.
Use p. 41 of your book to define “greenhouse effect” and “global warming”
Write your group’s Climate Regions (from yesterday) on the board. Copy those of other groups, finishing your CR Chart.

21. Greenhouse effect:

22. Greenhouse Effect: Caused by greenhouse gases:
Water Vapor (up to 79%)
Carbon Dioxide (up to 26%)
Methane (up to 9%)
Ozone (up to 7%)
Burning fossil fuels causes more CO2 in the air.
Evidence from ice core samples shows a distinct increase in greenhouse gasses in the atmosphere since the mid 20th century.

23. Case Study: The Poles
Read pages in your textbook. Also look at the satellite images on p. 77 and the atlas p. 31.
Make a Venn Diagram comparing and contrasting the North Pole and Antarctica (top of 25 in your ISN, below warm up).
Answer the questions on the board thoroughly and in complete sentences (page 25 in your ISN).