climate. day 1 objective: objective: – i can describe climate and the factors affecting it
TRANSCRIPT
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Climate
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Day 1•Objective:Objective:–I can describe climate and the factors affecting it
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What is Climate?
• Yearlong average of weather patterns over an area; determined by temperature and precipitation
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Factors that Affect Climate
• Latitude
• Elevation
• Topography
• Water Bodies
• Global Winds
• Vegetation
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Factor #1: Latitude
• As latitude increases, the intensity of solar energy decreases
• Three Zones–Tropical
–Temperate
–Polar
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The Zones
• Zone 1: Tropical Zone–Region between the
Tropic of Cancer (23.5ºN) and the Tropic of Capricorn (23.5ºS)
–Warm Year Round
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• Zone 2: Temperate Zone– Region between 23.5ºN/S
and 66.5ºN/s of the equator
– Hot Summers
– Cold Winters• Zone 3: Polar Zone– Region from 66.5ºN/S of
the equator to the poles
– Very cold temperature year round
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Factor #2: Elevation
• Higher the elevation is, the colder the climate
• Elevation determines amount of precipitation area receives
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Factor #3: Topography
• Land features affect amount of precipitation that falls over an area
• Mountains cause a rain shadow event– One side has cool, wet
air
– One side has warm, dry air
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Factor #4: Water Bodies
• Large bodies of water (lakes & oceans) have an important effect on the temperature of an area.
• Temperature of the water body influences the temperature of the air above (land areas near warm water currents have warm temperatures; ocean currents traveling away from equator are warm water currents)
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Factor #5: Global Winds
• Winds distribute heat and moisture around the Earth
• Warm air moves to the poles)
• Cold air moves to the equator
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Factor #6: Vegetation• Affects both temperature
and precipitation
• Temperature– Influence how much of the
sun’s energy is absorbed and how quickly it is released
• Precipitation– When plants release water
vapor from its leaves into the air (transpiration)
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Day 2• Objective:Objective:–I can describe how climates are
classified using the Köppen System.
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Köppen Climate Classification System
• Most commonly used system
• Uses mean monthly and annual values of temperature and precipitation
• Five Principal Groups– Humid Tropical
– Humid Mid-Latitude
– Dry
– Highland
– Polar
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Humid Tropical Climate
• No Winters
• Monthly average temperature above 18ºC (64.4ºF)
• Precipitation can exceed 200-cm
• Two Types– Wet Tropical
– Tropical Wet and Dry
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• Wet Tropical– High Temperature
– High annual precipitation
• Tropical Wet & Dry– High Temperature
– High annual precipitation
– Experiences distinct periods of low precipitation
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Humid Mid-Latitude Climate with Mild Winters
• Mild winters with an average temperature in the coldest month that is below 18ºC (64.4ºF) but above -3ºC (26.6ºF)
• Three Types– Humid Subtropical
– Marine West Coast
– Dry Summer Subtropical
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• Humid Subtropical– Between 25º and 40º
latitude on the eastern side of the continent
– Summer = hot, sultry
– Winter = wild
– NC climate
• Dry-Summer Subtropical – Between 30º & 45º latitude
– Strong winter rainfall
– Only found in California
• Marine West Coast – Between 40º and 65º N/S
on the coastal area
– Summer = cool
– Winter = mild
– Northern California to Southern Alaska
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Humid Mid-Latitude with Severe Winters
• Severe winters have an average temperature in the coldest month that is below -3ºC (26.6ºF)
• Two Types– Humid Continental
– Subarctic
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• Humid Continental– Not in the Southern
Hemisphere
– Between 40º and 50º N latitude
–Winters = Severe
– Summer = warm and great precipitation
• Subarctic–Winters are long and
bitterly cold
– Summers are warm and very short
– The highest annual temperature range on Earth
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Dry Climate• Yearly precipitation is
not as great as the potential loss of water by evaporation
• Two Types– Arid or Desert
– Semi-arid or Steppe• Transition zone that
surrounds the desert and separates it from humid climates
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Highland Climate
• Cooler and wetter than nearby areas at lower elevations
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Polar Climate• Average temperature of the
warmest month is below 10ºC (50ºF)
• Little precipitation falls
• Winters = extremely cold
• Summer = cool
• Two Types– Tundra
– Ice Caps
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• Tundra– Treeless region found
almost exclusively in the Northern Hemisphere
– Plant life of mosses, shrubs and flowering herbs
• Ice Caps–Monthly average
temperature below 0ºC (32ºF)
– Covered with permanent ice and snow
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Day 3• Objective:Objective:–I can explain the causes of changes
in climate locally and world wide
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Natural Process that Change Climate
• Volcanic Eruption
• Ocean Circulation
• Solar Activity
• Earth’s Motions
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Volcanic Eruption
• The presence of volcanic ash, dust and aerosols in the air increase the amount of solar radiation that is reflected back into space.
• Causes Earth’s lower atmosphere to cool
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Ocean Circulation
• EL NINO– Causes parts of the eastern
tropical Pacific Ocean to become warmer than usual
– Arid places receive large amounts of rain
– Places that receive lots of rain may experience dry periods
– HERE? We have wet summers
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• LA NINA– Surface temperatures
in the Eastern Pacific are colder than average
– Hurricanes damage greater in La Nina times
– HERE? We have dry summers
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Solar Activity
• Formation of sunspots appear to correspond with warm periods in Europe and North America
• 11 year cycle
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Earth’s Motion
• Orbit and Tilt– Earth’s tilt causes the
seasons
– Change in the degree of tilt or shape of orbit could cause global climate changes
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Human Impact on Climate Change
• The Greenhouse Effect– Is a natural warming of
both Earth’s lower atmosphere and surface
– Makes life as we know it possible
– Major Gases: Water Vapor and Carbon Dioxide
– Humans have added more greenhouse gases to the atmosphere in the past 200 years by burning fossil fuels
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Global Warming
• As a result of increases in Carbon Dioxide (CO2) as well as other greenhouse gases, global temperatures have increased
• Affects weather and climates
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Temperatures Rising due to Global Warming
• Effects– Glaciers melting
– Greenland—If all of the ice melts, oceans will rise 23 feet
– Antarctic—major reduction in ice coverage
– Permafrost in Tundra is releasing CO2 that is stored under the ice
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Hottest Years• Since 1980, the Earth has had 19 of its 20 hottest years on
record1. 2010
2. 2005
3. 2009
4. 2007
5. 2006
6. 1998
7. 2002
8. 2003
9. 2001
10. 1997
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Antarctica Melting
• If all of the ice in the glaciers of Antarctica melts, the oceans will rise
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Word bank• cool
• cooled
• decreases
• decreases
• dry
• dry climates
• heavy precipitation
• higher
• low ranges
• lower
• precipitation
• temperatures• warmed
• warmed
• wind