METO 621 - ATMOSPHERIC RADIATION
HOMEWORK #1
DUE FEBRUARY 11, 2010
(1) ALambertian
disk of radius a emits an isotropic intensity I.
Show that the outwardflux at a point lying on the
axis of the disk, a distance z from the center ofthe
disk, is given by:
(2) The effect of thevarious
greenhouse gases on the radiative forcing may be crudely estimated bysetting the effective transmission as where
is
the opacity due to the
species,
Suppose that the concentration of a single species(say
CO2) were increased from
to
:
(a)Show that the radiative forcing
is given by
(b) Show that for a CO2 doubling (forwhich ),
the required percentage change in opacity is only 3.4%.What factors tend to
reduce the radiative effectiveness of a doubling of CO2
(3) Explain the following terms:
(A)Climate sensitivity.
(B)Climate feedback.
(C)The
gain of a climate system