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The Warmer the Object, the More Heat Emitted Objects above absolute zero emit EM radiation (usually IR) Stefan-Boltzmann Law tells how much energy emitted

Stefan-Boltzmann Law in LSOP Activity

Stefan-Boltzmann Law in LSOP Activity

Modeling Planetary Energy Balance Calculate theoretical temperature of a planet with some simple math Discover that Earth would be frozen without the greenhouse effect Science Topics Blackbody Radiator and the Stefan-Boltzman Law Conservation of Energy (Energy In = Energy Out) Albedo

Let’s add some atmosphere… How will this change the behavior of our model?

LSOP Model - Atmosphere

Turn 1 – Radiate Phase

Turn 1 – Absorb Phase

Change – Initial State to Turn 1

Net Energy Budget: Energy In – Energy Out

Change from Initial State to Turn 1 Energy In – Energy Out = 3 – 1 = +2 +2 -1 +1

Turn 1 – Radiate, then Absorb

Turn 2 – Radiate, then Absorb

Turn 3 – Radiate, then Absorb

Graph of Spinup to Equilibrium

What is “wrong” with this model?

Turn 4 – Radiate, then Absorb

Turn 5 – Radiate, then Absorb

Net Energy Budget?

Net Change After 2 Turns of Night

Spinup to Dynamic Equilibrium

Show Movies Model Spinup Equilibrium Spinup – with day/night cycle Dynamic Equilibrium

LSOP Model – No Atmosphere

Turn 1 – Radiate Phase

Turn 1 – Absorb Phase

Turn 2 – Radiate Phase

Turn 2 – Absorb Phase

Turn 3 – Radiate Phase

Turn 3 – Absorb Phase

Turn 4 – Radiate Phase

Turn 4 – Absorb Phase

Graph of “data” from model run “experiment”

Turn 4 – Radiate Phase - Night

Turn 4 – Absorb Phase - Night

No Atmosphere Spinup to Equilibrium