Impact of information updating of the atmospheric gases absorption line parameters on the results of simulation of the IR radiative fluxes in the atmosphere
T.Yu. Chesnokova1, K.M. Firsov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Volgograd State University, Volgograd, Russia
Keywords: atmospheric radiative transfer, IR radiative flux, spectroscopic database
Abstract
An impact of uncertainties of the atmospheric gases absorption line parameters in the modern spectroscopic databases on the longwave fluxes simulation in the atmosphere is estimated. The mass calculations of downward and upward IR fluxes are carried out for meteorological conditions observed in summer months in the Lower Volga Region and winter months in Novosibirsk and for average zonal meteorological models. The radiative fluxes and cooling rates at different levels of the atmosphere calculated with use of new versions of HITRAN and GEISA spectroscopic databases and its previous versions are compared. It is shown that the difference in absorption line parameters in the spectroscopic databases leads to an error less than 0.7 W/m2 (0.3%) in the simulated integral fluxes in the 0-3000 cm-1 region, at that the relative differences in the spectral fluxes calculated with moderate spectral resolution (20 cm-1) are up to 10%. The atmospheric gases and spectral intervals contributing more to the errors in the IR fluxes simulations due to uncertainties of initial spectroscopic information are revealed.
|
