A modernization of the analysis method for vertical structure of aerosol component in giant planet atmospheres

1Ovsak, AS
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2013, 29(6):53-67
Start Page: Dynamics and Physics of Solar System Bodies
Language: Russian

We developed a program package to determine the nature of the depth change of aerosol optical thickness or the optical thickness ratio for aerosolic and gas components for spectral absorption bands of atmospheric gases. Structurally, the program package consists of the following units: the calculation program of M. I. Mischenko to determine coefficients xi of the scattering function expansion in a series of Legendre polynomials and volumetric scattering coefficient σ0 for the polydisperse media with a specified refractive index and function for the particle size distribution N(r); the formation of the interpolative array of calculated values for single scattering albedo ω and geometric albedo Ag in the case of a semi-infinite homogeneous layer with the parameters determined in the previous unit; determining the values of the single scattering albedo ω by comparing calculated and observed values of geometric albedo for each measuring points of the investigated absorption band of methane (including changes of scattering function due to the Rayleigh scattering); the calculation of spectral values of the effective optical depth τeff which forms the intensity field of light diffusely reflected by upper atmosphere gas-aerosol layer; finding the scattering (τseff) and absorbing (τveff) components of effective optical depth on the basis of and τeff data; the determination of the amount of methane NL (in km-amagat) on the line of sight with the use of τveff data and then an atmospheric pressure p(NL) and gas scattering component τg0) of full optical depth at the wavelength λ0 = 887.2 nm; finding an aerosol component τa(λ,NL) according to the data on τseff (λ) and τg(λ,NL); building a graphical relationship between pressure p and values τa(λ) converted at λ0 = 887.2 nm or τa(λ)/τg(λ). The program package was validated to perform an analysis of spectrophotometric measurements of Jupiter’s integrated disk in strong absorption bands of methane centered at 841.6 nm, 864.0 nm, and 887.2 nm. This analysis was carried out for two versions of function of particle size distribution (the modified gamma distribution and normal-logarithmic one). We found that the analysis in the gamma distribution model is performed several times faster for the same environment and with close results.

Keywords: aerosol, planet-giants

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