1. ATOC 4720 class27 Radiative transfer in global energy balance
The globally averaged atmospheric energy balance

2. 1. Radiative transfer in global energy balance
Planck’s law:
Stefan-Boltzmann’s law:
Wien’s displacement law:
Kirchhoff’s law:

5. Effect of atmosphere on radiation
Scattering:

6. Reflection

7. Longwave emission

8. Processes important for energy balance
Scattering of solar radiation by clouds (albedo);
Absorption of solar radiation by gases (O3 upper atmosphere and H2O lower atmosphere);[photodissociation]
Absorption of terrestrial radiation by gaseous constituents (CO2, H2O, O3): green house effect;
Absorption of terrestrial radiation by clouds, enhance green house effects; [example]

9. 2. The globally averaged atmospheric energy balance
Blackboard demonstration: see class notes for detail.