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Atmosphere Opacity<br />

1) Cloud model<br />

2) Molecular opacity<br />

O 3<br />

O 2<br />

H 2O<br />

3) Rayleigh scattering<br />

4) Aerosols<br />

Have complex spatial & temporal variation<br />

Local optical depth calculated for each ray<br />

segment<br />

Absorption is pressure-dependent and therefore<br />

height dependent

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