Parameterization of carbon dioxide 15-micron band absorption and emission

Physics

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Atmospheric Models, Carbon Dioxide, Emission Spectra, Infrared Absorption, Parameterization, Stratosphere, Absorption Spectra, Atmospheric Temperature, Error Analysis, Root-Mean-Square Errors, Transmittance

Scientific paper

A parameterization scheme for carbon dioxide 15-micron band absorption and emission is developed based on the line-by-line transmittance data presented by Fels and Schwarzkopf (1981). Two polynomial equations are derived to represent the broadband emissivity as functions of the temperature and pressure corrected path length. A detailed error analysis has been performed, and the root mean square errors are shown to be on the order of 5 and 7.5 percent for the lower and upper atmosphere cases, respectively. Cooling rates calculated from the emissivity parameterization approach show errors within about 5 percent when they are compared with those computed from exact line-by-line integrations.

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