Posted by **donna** on Sunday, November 22, 2009 at 4:33pm.

The current magnitude of the greenhouse effect is measured by the

difference between the emission from the surface and the emission from the top of the

atmosphere,

€

G =σTs

4 −σTe

4 ≈ 150 W m-2. What would be the required magnitude of

the greenhouse effect to maintain the surface temperature at 288 K if the solar constant

were reduced by 30%? By what distance would the effective emission level of the

atmosphere need to rise if the lapse rate is approximately 6 K km-1?

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