Modeling radiation absorption by water vapor in the atmosphere within the 0- to 20000-cm-1 spectral range

摘要

Our recent studies of the continuum absorption of radiation by pure water vapor has been extended to the case involving air-broadening. A specific nonlinear absorption dependence has been derive for inhomogeneous optical media. The computations are performed by an original information system AIRSENTRY. The absorption within the short-wave region is a linear function of the partial pressure of water and of the total pressure. The absorption by water vapor in the atmosphere and the Rayleigh scattering are taken into account in order to describe in situ experiments and a good coincidence with measurements is observed for the optical depth calculated up to the spectral region of 20000 cm$+$MIN@1$/. The discrepancies among experimental data of various authors may be explained by different path parameters used, since the latter are sensitive in the nonlinear absorption analysis. A solution of the enhancement problem is suggested for both transmission windows and absorption bands. The continuum conception used in the present studies suggests that all lines to be for all the absorbers and buffer gases in the WV, IR, and UV region contribute to the continua via either the pure absorption or the hypothetical nonlinear molecular absorption-scattering phenomenon.