climate and biomes an abrupt climate change scenario and its implications for united states national...
TRANSCRIPT
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CLIMATE and BIOMES
An Abrupt Climate Change Scenario and Its Implications for United States National Security (Pentagon Report, 2003). Global warming “should be elevated beyond a scientific debate to a US national security concern... future wars will be fought over the issue of survival rather than religion, ideology or national honour.”
Understanding climate matters...
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CLIMATE
I. Large Scale Determinants
A. Solar Radiation1. Average Radiation Budget
- Solar Constant = 2 calories/cm2/min
- 50% is reflected, absorbed, reradiated (Most ultraviolet light is reflected/absorbed) by the atmosphere
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- 50% is reflected, absorbed, reradiated (Most ultraviolet light is reflected/absorbed)
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Greenhouse effect
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A. Solar Radiation1. Average Radiation Budget 2. Local Radiation Budget – Angle of incidence (latitude and season)
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A. Solar Radiation1. Average Radiation Budget 2. Local Radiation Budget – Angle of incidence (latitude and season)
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HIG
H E
NER
GY
LOW
EN
ERG
Y
LOW ENERGY
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HIG
H E
NER
GY
LOW
EN
ERG
Y
LOW ENERGY
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As air rises: - decrease pressure - increase volume - decrease energy/unit volume - decrease temperature
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As air rises: - decrease pressure - increase volume - decrease energy/unit volume - decrease temperature
Decrease temp, increase tendancy of water vapor to condense
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