A first, rudimentary climate model

Who proposed had this idea first ?

Click here if you are curious

Assumptions

  1. a = 0.3 = fraction of incoming sun light reflected back to earth Earth's atmosphere does not hinder any sun light impinging on earth's surface
  2. Circulation of atmosphere ( wind ) and ocoan currents equalize temperature across the globe.
    Mean temperature
    Equator+27°C = 300°K
    North Pole-34°C = 239.1°K
    Antartic−57°C = 216.2°K
    Overall14.6° C = 287.7°K
  3. Gases in the atmosphere transmit sun light without any absorption
  4. Gases in the atmosphere transmit outgoing infra-red without any absorption

Energy received from sun

Earth, total energy received from sun
= π * R2 * ( 1 - a ) * L
a = 0.3 = fraction of incoming sun light reflected back to space (satellite)

Energy lost to space

Earth, total energy emitted
= 4 * π * R2 * σ* T4

Equilibrium

Gains equal losses in the long term.

>>>>>> T = 255°K = -18°C = 0°F Snow Ball Earth

What are we missing ?

  1. Heat from inside earth
  2. Tidal friction
  3. Variation of energy produced by sun (11-year sun spot cycle, any long term variation ?)
  4. Variation of earth's orbit around sun ( ice ages )
  5. Ideas from the audience ....

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Zig Herzog; hgnherzog@yahoo.com

Last revised: 08/23/13