Radiation balance: Greenhouse effect in the cup
Radiation balance for two experiment setups related to the greenhouse effect: an open plastic container as well as a plastic container with a lid and black paper.
In the closed container with the absorber (on the right), the light shining into the container is mostly absorbed by the black cardboard. The heated cardboard emits radiation of longer wavelengths. This long-wave radiation is absorbed by the container’s wall and emitted as radiation: The container’s interior warms up.
1 Reflection at the container’s wall
2 Absorption by the probe
3 Absorption by the black cardboard
4 Long-wave radiation from the black cardboard
5 Absorption and reradiation by the container’s wall
6 Radiation by the container’s wall to the surroundings