THE PROGRAM FOR CALCULATING THE ASYMMETRY COEFFICIENTS OF AEROSOL SCATTERING IN THE RED AND NEAR IR REGIONS OF THE SPECTRUM

V.V. Pashnev, Yu.Ya. Matyuschenko, V.V. Belozerskikh, A.V. Kalachev
 DOI: 10.25699/SSSB.2021.36.2.008 Download PDF
Abstract: In this paper, software is presented that implements the method for determining the aerosol asymmetry coefficient from the results of observations of the integral coefficient of scattered light fluxes, optical depth and albedo of the terrain by interpolation without using an apparatus for solving inverse problems. The data of measurements of the angular variation of the brightness of the daytime cloudless sky in the solar almucantar with different spectral transparency of the atmosphere and the albedo of the underlying surface are used as the initial data. Observations are carried out at wavelengths of 675, 870 and 1020 nm at zenith angles of the Sun 65 ÷ 750 , while the brightness can be measured in any unit, including directly the readings of the photometer. When processing the results of monitoring observations, even at one wavelength, it is required to perform a significant number of calculations of the same type, which makes the task of automating the calculations of atmospheric parameters, in particular, the asymmetry coefficients, undoubtedly relevant. Requirements for the input data are stated, a block diagram of the algorithm and a description of the user interface of the program are presented. The calculation results are displayed in tabular form. The program provides an acceptable error in determining the asymmetry coefficients and can be used in geophysics and climatology when calculating the arrival of scattered solar radiation on the earth's surface in order to further estimate the particle size.
Index terms: coefficient of asymmetry of scattered light fluxes, absolute indicatrix of brightness, albedo of the underlying surface, aerosol optical depth, linear interpolation.

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