Daisyworld & Feedback Effects Kump Chapter 2 Tark Hamilton.

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Presentation transcript:

Daisyworld & Feedback Effects Kump Chapter 2 Tark Hamilton

Average Climate Response of the 5 Largest Volcanic Eruptions ( ) Krakatau (1883), Santa Maria (1902), Agung (1963), El Chichón (1982), Pinatubo (1991)

Mt. Pinatubo Luzon, Philippines June 12, days VEI=6 Event 10 km 3 of tephra 20 Mtons of SO °C cooling O 3 depletion

SO2 Aerosols block sunlight Arc Volcanoes with subducted or sediment contamination are worst

Negative Feedback: Equilibrium is Some Daisys & Some Dirt!

Designing Graphs: Data Display (measurements points, details) versus Concepts (general trends) (both are auto-scaled to show the range of variation) Daily Temperature Variation

Systems Diagram Graphic for how Surface Temperature Affects Daisy Coverage

Two Forcing Functions: Surface Temperature on Daisies (Curve) vs Daisys on Surface Temperature (line) & Equilibrium Diagram: P 1 stable versus P 2 unstable

Negative Feedback is Stable Equilibrium Positive Feedback is unstable, runaway heating

Increased Solar Luminosity increases heat at constant Daisy Coverage

Increasing Solar Luminosity Shifts Equilibria, while White Daisys still reflect heat the same way: i.e. Just different stable % coverage

Response of Daisyworld to Luminosity ΔT eq = ΔT 0 + ΔT f Where: ΔT 0 w/o feedback ΔT eq < ΔT 0 and ΔT f < 0

P 1 shifts because of negative feedback

a) Daisyworld’s response to Increased Luminosity (neg. feedback on T°C) b) Lifeless Planet with fixed albedo

Captain Kirk would never have expected the blue curve!