5. Forcing - Climate Forcing Forcing Climate System...

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Unformatted text preview: Climate Forcing Forcing Climate System Geologic Record “Proxies” Input Output Climate Forcing • What processes cause climate change? • What are the forcing mechanisms? – External forcing – Internal feedbacks Climate Forcing • Forcing = long term disturbance (S/4) (1 -α29 = σ T e 4 Earth’s incoming = outgoing radiation • Limited variables to alter to produce global climate change Climate Forcing • (S/4) (1 -α29 = σ T e 4 • Variables that can be altered: – Solar insolation (S) – total or distribution – Albedo ( α )- total or distribution – Atmospheric composition – quantity and composition of greenhouse gases Climate Forcing • Redistribution of solar insolation • Leads to climate change through feedbacks – Albedo – Greenhouse gas effects • Example- orbital forcing warming at high lats – Melt back ice lower albedo warming – Melt wetlands methane release warming Forcing Mechanisms Internal vs. External • External Mechanisms – Outside of the climate system – Forcing affects the climate, but is unaffected by the climate state Forcing Mechanisms Internal vs. External • Internal mechanisms- feedback effects within the climate system – Generally initiated by an external event – Forcing causes a change in climate that in turn affects the forcing mechanism (climate feedback) Forcing Mechanism • External Forcing Mechanisms: * Solar radiation* – Sunspot variations and irradiance variations – Solar diameter – Magnetic variations * Earth's Orbital changes (Milankovitch Forcing) • Eccentricity • Tilt • Precession * Asteroid impacts Sun spots Forcing Mechanism • External Forcing Mechanisms: * Solar radiation – Sunspot variations and irradiance variations – Solar diameter – Magnetic variations * Earth's Orbital changes (Milankovitch Forcing)* • Eccentricity • Tilt • Precession * Asteroid impacts Orbital Forcing...
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This note was uploaded on 07/08/2011 for the course GLY 3074 taught by Professor Ellenmartin during the Spring '09 term at University of Florida.

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5. Forcing - Climate Forcing Forcing Climate System...

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