14globalclim.big

14globalclim.big - Global Climate Change Radiative...

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1 Global Climate Change Radiative Equilibrium, Solar and Earth Radiation Atmospheric Greenhouse Effect Greenhouse Gases Global Climate Change Predictions: Temperature, Sea Level Feedback Effects Alternative Causes Historical Climate Trends Remediation: Greenhouse Gas Emission Reduction
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2 Radiative Equilibrium Absorption Emission Radiative Equilibrium: amount of EMR absorbed equals amount of EMR emitted
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3 Sun and Earth are both near-blackbodies I λ Sunlight Terrestrial radiation Sun, 6000K: emits mostly visible light Earth, 255K: emits mostly infrared radiation
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4 Atmospheric Absorption Earth’s atmosphere is a selective absorber (not a BB) Transmits visible light (such as sunlight) Absorbs infrared radiation (such as terrestrial radiation)
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5 S E A
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6 Greenhouse Gases These are gases that are transparent to visible light, partially opaque to infrared radiation Earth’s major greenhouse gases: Water vapor Carbon dioxide CFCs Methane Nitrous oxide Ozone
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7 Global Warming Potential (GWP) —related to amount of predicted warming (“radiative forcing”) from a unit increase in gas concentration GWPs relative to carbon dioxide: Carbon dioxide 1 Methane 21 Nitrous oxide 310 Chlorofluorocarbons 4000–20000
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8 Water Vapor (H 2 O) Sources Evaporation of oceans, land surface water Anthropogenic emissions (insignificant) Sinks Condensation, precipitation Largely out of the control of humans; at higher air temperatures, water vapor content is often higher than at lower temperatures
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This document was uploaded on 09/03/2009.

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14globalclim.big - Global Climate Change Radiative...

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