CO2 Absorption of Infrared Radiation Around 14.9 Micrometers

Plot of the spectral lines of absorption by carbon dioxide for the main absorption peak around 15 micrometers.

Carbon dioxide (CO2) absorbs radiant energy primarily in 4 major bands shown below (Rohde, 2013). The details of absorption for the major band around 15 micrometers are shown above based on extensive laboratory measurements (Rothman et al., 2013). Absorption is along very narrow spectral lines determined by oscillations about each degree of freedom within the structure of the molecule.

Note that CO2 absorbs a very tiny percentage of total radiation from Earth.

Plot of absorption by greenhouse gases of radiation from the sun and from Earth.

Last updated 05-Dec-2015    © 2015 Peter L. Ward. All Rights Reserved