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Planetary Engineering 1

Planetary Engineering 1. Climate Modeling Class Exercise. Zero-Dimensional GEBM. Global energy balance: Radiative equilibrium (in = out). Goal: Planets ’ Temperatures. Important Fact: Sun heats less the farther it is. Important Factor: How does S change with orbit?.

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Planetary Engineering 1

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  1. Planetary Engineering 1 Climate Modeling Class Exercise

  2. Zero-Dimensional GEBM Global energy balance: Radiative equilibrium (in = out)

  3. Goal: Planets’ Temperatures Important Fact: Sun heats less the farther it is. Important Factor: How does S change with orbit?

  4. Recall from Topic 1: Change in solar flux: sun  earth At photosphere surface, solar flux ~ 6.2.107 W-m-2 At Earth’s orbit, solar flux ~ 1360 W-m-2

  5. Two Spheres Surrounding Sun Total energy flux the same through each sphere R2 = 2 x R1 R2 R1 The same area at R2 intercepts only 1/4 of energy it intercepts at R1  Flux decreases as R-2

  6. For Earth Global energy balance: Radiative equilibrium (in = out) Thus, TRAD= 255 K

  7. What about other planets? How does Trad change with orbit?

  8. What about other planets? How does Trad change with orbit? Planet Distance Albedo Outgoing IR Trad from sun [A.U.] [W-m2] [K] Mercury 0.39 0.06 Venus 0.72 0.76 Earth 1.00 0.30 238 255 Mars 1.52 0.16 Jupiter 5.20 0.51 Saturn 9.54 0.50 Uranus 19.18 0.66 Neptune 30.06 0.62

  9. For Mars Tsurface ≈ Trad. How warm can we make its surface?

  10. For Mercury Tsurface ≈ Trad. How cool can we make its surface?

  11. Venus? Why can’t we adjust Venus the same way?

  12. End Planetary Engineering 1

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