File:Longwave Absorption Coefficients of H2O and CO2.svg
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Summary
| Description |
English: This chart plots the absorption coefficient of water vapor and carbon dioxide, for electromagnetic radiation with wavenumber values (i.e., frequency divided by the speed of light) in the range 200-1600 cm-1 (wavelengths in the range 6.25-50 microns).
Note that, in the vicinity of its 15-micron absorption band, CO2 is a much stronger absorber than is water vapor. This is relevant to the greenhouse effect because Earth strongly emits thermal radiation in this range. Water vapor is a stronger absorber than CO2 for radiation with wavenumbers/frequencies at the left or right side of the plot. Results are for sea-level atmospheric pressure, a water vapor concentration of 0.25%, and a CO2 concentration of 420 ppm. The figure was generated using calculations done by the HAPI 1.2.2.0 software package available at http://hitran.org/hapi (Reference: R.V. Kochanov, I.E. Gordon, L.S. Rothman, P. Wcislo, C. Hill, J.S. Wilzewski, "HITRAN Application Programming Interface (HAPI): A comprehensive approach to working with spectroscopic data," J. Quant. Spectrosc. Radiat. Transfer 177, 15-30 (2016) DOI: 10.1016/j.jqsrt.2016.03.005), using spectroscopic data from the HITRAN database. |
| Date | |
| Source | Own work |
| Author | Rhwentworth |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:42, 2 June 2023 | | 576 × 432 (262 KB) | wikimediacommons>Rhwentworth | Technical update |
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