One-layer atmosphere model for Venus surface and atmospheric temperatures

[Sunshin3]

1. Homework Statement
Consider a one layer atmosphere for the planet Venus. 19% of incoming solar radiation is absorbed by the atmosphere. 99% of the outgoing radiation is absorbed by the atmosphere. The incoming radiation, E, as measured by satellite is 615 Wm-2.

1) Derive two equations, one for the top of the atmosphere and the other for the Venusian surface in terms of x, y and E. Solve for the surface and atmospheric temperatures.

Homework Equations

None we need to create the equations but i do not know where to start.

The Attempt at a Solution

Please help! i have no clue where to start

 

[Andrew Mason]

If 19% of the incoming radiation from the sun is absorbed, what happens to the other 81%? If the whole atmosphere is in thermal equilibrium, what must the lower atmosphere radiate back out?

AM