We present an experiment investigating the physics of the atmospheric greenhouse effect that can be performed by undergraduate physics students. The students construct a three-channel spectral photometer to observe the infrared heat flux in the atmosphere. With this spectral photometer, the students observe the difference in heat flux between the portion of the IR spectrum that is absorbed by water vapor and carbon dioxide and the portion that is not absorbed by atmospheric constituents. The students discover that Earth's surface is warmed by radiation from the greenhouse gas absorption bands, and the radiation of heat to space is retarded by the absorption bands. One component of the experiment is performed on the ground and the other component is performed in the atmosphere using a high-altitude balloon. The students then compare their results to a simulation of infrared radiation transport in the atmosphere.
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1 September 2023
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September 01 2023
Improved spectral photometer for undergraduate observations of atmospheric infrared heat flux and greenhouse gas absorption bandsa)
Special Collection:
Teaching about the environment, sustainability, and climate change
Gerard T. Blanchard;
Gerard T. Blanchard
b)
Department of Chemistry and Physics, Southeastern Louisiana University
, Hammond, Louisiana 70402
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Bryce A. Bowlsbey;
Bryce A. Bowlsbey
c)
Department of Chemistry and Physics, Southeastern Louisiana University
, Hammond, Louisiana 70402
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James R. Dyess;
James R. Dyess
d)
Department of Chemistry and Physics, Southeastern Louisiana University
, Hammond, Louisiana 70402
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Ryan D. Rumsey;
Ryan D. Rumsey
Department of Chemistry and Physics, Southeastern Louisiana University
, Hammond, Louisiana 70402
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Justin B. Woodring
Justin B. Woodring
e)
Department of Chemistry and Physics, Southeastern Louisiana University
, Hammond, Louisiana 70402
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Am. J. Phys. 91, 708–713 (2023)
Article history
Received:
November 15 2022
Accepted:
June 09 2023
Citation
Gerard T. Blanchard, Bryce A. Bowlsbey, James R. Dyess, Ryan D. Rumsey, Justin B. Woodring; Improved spectral photometer for undergraduate observations of atmospheric infrared heat flux and greenhouse gas absorption bands. Am. J. Phys. 1 September 2023; 91 (9): 708–713. https://doi.org/10.1119/5.0135029
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