Download Climate Change Notes I

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Transcript 
Greenhouse Effect
Mechanisms Affecting the Greenhouse
Evidence for Climate Change
1. Radiation from Sun enters atmosphere
a. Reflection (clouds, ice, water)
b. Absorption by Surface
2. Earth’s surface creates infrared radiation
a. Greenhouse gases trap infrared radiation
b. CO2, H20, CH4
1. Increased Solar Reflection
a. Volcanic ash, impact ash, glaciers
b. Plate tectonics /ocean currents/ice caps
2. Less solar radiation from Sun (orbit/tilt)
3. Less greenhouse gases (cycles)
1. More greenhouse gases
a. Changes in cycles that recycle gases
b. Burning of fossil fuels
c. Volcanic gases
2. More solar radiation
a. Changes in Earth’s tilt and orbit
b. Positive feedback loops
Evidence for Climate Change
PAST
PRESENT
North America Ice Age • Retreating Glaciers (melting)
Glacial material & landforms,
lakes, sea levels, extinctions
• North pole ice sheet shrinking
Eocene Thermal Maximum • Changing migrations
Sea levels, ocean core samples, • Species moving northward
extinctions
• Average global temps
• Ocean temps
• Sea Levels
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