The evaluation of the contribution of numerous H2O absorption lines to the atmospheric transmission in the 8-12 μm transparency window is presented based on different spectroscopic databases of water vapor absorption lines, including the new theoretical data sets POKAZATEL and VoTe, as well as the H2O data from the popular spectroscopic databases HITRAN and GEISA. Comparison of the atmospheric transmittance calculated using different databases is presented. The contribution of the weak lines is investigated and shown to be important for very long absorption paths.
The work done on the systematization of water molecule absorption cross-sections in W@DIS information system is reviewed. The collection of the water molecule spectral functions, GrafOnto system for working with collections of spectral function plots, and basic plot properties are briefly described. Examples of representations of different plot types for water vapor spectral functions are given.
The atmospheric transmission has been calculated using different spectroscopic data in the 400–700 nm region. The new absorption cross sections of O3 and NO2 are considered. The H2O absorption lines from modern spectroscopic databases are taken into account and the solar radiative fluxes, measured by ground-based photometers with filters in the visible wavelength bands, are simulated.
Estimations of the effect of modern ozone absorption cros-ssections data on calculation of the atmospheric transmission and fluxes, measured using Sun photometers in the UV spectral region, are made. The ozone absorption cross-sections, often used in radiative codes, and new data of Serdyuchenko et al. are considered.
This paper presents study results of the technical features of Cr2+:ZnSe laser, which performs differential absorption LIDAR measurements for atmospheric constituents and pollutants. Simulation of atmospheric optical depth was carried out using HITRAN2012 for a Cr2+:ZnSe laser spectral wavelength tunability range on the line-by-line basis. The best wavelengths pairs of λON and λOFF and suitable gases to be detected in DIAL measurements of several molecular species were chosen.
KEYWORDS: Absorption, Spectroscopy, Molecules, Data modeling, Databases, Atmospheric chemistry, Temperature metrology, Thermodynamics, Data acquisition, Oxygen
Our research into generation of a set of absorption cross sections of atmospheric molecules is reviewed briefly. Particular emphasis is placed on a description of a software toolkit for building information objects that characterize molecules and weakly bound molecular complexes, an application that provides the import and export of the absorption cross sections and representation of metadata and ontolology of information resources collected in a set.
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