For example, absorption coefficients in the band centered at 71 μ m increases from 0.3 to 1.2 m − 1 at the tropopause and 0.6 to 3.1 m − 1 at the Earth's surface as mole fraction of water vapor increases from 0.005 to 0.02. The results show that absorption coefficients are strongly affected by water vapor concentration. Solving one-dimensional unsteady heat conduction-radiation equation with the COMSOL computer code, the predicted temperature together with water vapor density for different optical path lengths can be used to interpret in details absorption coefficient or the ratio between band intensity and effective band width by using the exponential wide band model. Extending the previous work for predicting absorption coefficient of carbon dioxide through the troposphere, this work further determines absorption coefficients of water vapor in different wavelength bands centered at 71, 6.3, 2.7, 1.87 and 1.38 μ m across the temperature, pressure and concentration-dependent troposphere layer. The difference in solar irradiation and energy escaped to the space from the atmosphere results in the atmosphere acting as the glass of a greenhouse and increase atmospheric temperature. Radiative within high wavelength range from the Earth's surface can be absorbed by atmospheric water vapor, carbon dioxide and other gases. Solar irradiation within short wavelength range can be extinguished from absorption and scattering by the atmosphere, and absorbed and reflected by the Earth's surface. Since global warming plays an important role in affecting the human life, a confirmative and detailed study of global warming is essentially need. Absorption coefficient of water vapor proposed to be responsible for an increase in temperature in the troposphere layer with altitude less than 10 km is systematically presented in this work.
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