The relationship between absorption coefficient and temperature and their effect on the atmospheric cooling rate |
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Authors: | Guangyu Shi |
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Institution: | a State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, The Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China b Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China |
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Abstract: | Several approaches are considered to determine the temperature effect on the absorption coefficient within a correlated k-distribution method. Taking in the 610- region for example, the absorption coefficients and atmospheric cooling rates calculated using these approaches are compared with line-by-line integration. It is emphasized in this paper by numerical calculation that the effect of pressure on absorption coefficient is related to temperature and vise versa; the larger the pressure, the larger the effect of temperature on absorption coefficient. Results show that the temperature effect must be considered in radiative calculations although its effect on the absorption coefficient is much smaller than that of pressure. |
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Keywords: | Absorption coefficient Cooling rate Correlated k-distribution Temperature effect |
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