Evolution of Life (Cyanobacteria creating O2 in the atmosphere)
Extrinsic Factors of Global Change
Effects of Global Change
1. Sea Level Change
2. Change in Oceanic & Atmospheric Circulation and Carbon Cycle leading to Climate Change
3. Evolutionary Change
Hadley Cell Circulation
A natural phenomenon occurring at the equator in which warm moist air rises during the day, cools and expands, descending as cool, dry air at the tropic lines. It shapes the wet and dry regions, and creates equatorial rainforests and deserts!
- created by winds
- continents get in the way, causing cold and warm water to be deflected into other seas
- position of the continents makes a BIG DIFFERENCE
- Think of the Gulf Stream
Water circulation produced by differences in temperature and/or salinity (and therefore density).
Ex: Freshwater in Antarctica
Details about Climate Change can be found in...
Fossils (Ratio of 016 to O18)
Vostok Ice Core
Longest ice core drilled.
Went back 420,000 years and revealed 4 past glacier cycles.
last 10,000 years reveal the beginning of the archeological record of human settlement
Cyclic climate changes
-Orbital Variations (spinning wobble, tilt, changes in eccentricity [circular vs. elliptical])
-what we are currently in
-Permian-Carboniferous & Late Cenozoic
carbon dioxide, water vapor, methane
Late Cenozoic Glaciation
Low CO2 and CH4 levels
organic carbon burial
formation of carbonate rocks
Continental configuration conducive to glaciation
Warming Climate since...
Industrial Revolution triggered?
Consequences of global warming
sea level rise
tropical storms & wildfires
ecosystems will be disrupted
Ecosystems in the Last Ice Age
forests shifted with temperature
tropical diseases and pests move North
Oysters are losers
Scallops are winners
Cotton in Canada
Wheat along the Hudson Bay
Temperature projections for 2080
All hot, little rainfall
What can be done to reduce warming?
CO2 Sequestration - remove from atmosphere and bury it/force a reaction to produce limestone
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