Elevation & impact on weather & climate

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2.6 Elevation & Climate
• Understand the relationship between
elevation & climate
• Chapter 4 p. 71
2.6.1 Define Elevation p. 71
• Elevation = height of a region above sea level
• Figure 1.6 p. 8 shows cross section of Canada
4000 m
Sea Level
Winnipeg
239 m
DID YOU KNOW?
• Air temperature decreases 2oC for every
300m increase in elevation
• IT’S TRUE!! In fact, the higher up we go; the
colder it gets; hence snow on mountain tops
2.6.2 Describe the relationship between the
elevation of a point and its temperature and
precipitation.
See Figure 4.19 – Textbook…what is the relationship between
temperatures and elevation???? Stop
La Paz & Rio de Janeiro
have similar dist. from ocean
& similar latitude. La Paz is
much colder because of
higher elevation .
•La Paz, Bolivia
•Rio de Janeiro, Brazil
•Elevation = 3600m
•Elevation = 61m
•Coldest month = 9oC
•Coldest month= 25oC
2.6.2 Describe the relationship between the
elevation of a point and its temperature and
precipitation.
•
•
•
•
Relief Rainfall
Windward Side of mountain
Leeward Side of Mountain
Rain shadow – What side?
Relief Rainfall – Recap!!!
Elevation and Precipitation
• Windward = side of a
mountain wind blows toward
• Leeward = side of
mountain opposite from
windward
• Rain shadow = region on
leeward side of mountain
that receives little
precipitation because
most rain dropped on
2.6.3 Analyze the relationship between
temperature and precipitation of a point and its
location relative to a mountain system.
• Cities higher up in a mountain have colder temperatures
• Cities on leeward side have little rain (rain shadow)
• Cities on windward side have more rain
Match the city to the data
Vancouver
wind
•1113mm rain & 0oC coldest month
Prince George
•628mm rain & -12oC coldest month
2.6.3 Practice
• #37
• #40 a & b
• #41 a & b
p. 71
p. 72
p. 72
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