Estimation Of The Most Probable Values Of The Aerosol Extinction Of Radiation In The Near-Ground Atmosphere Of The City Of Tomsk

The results of twenty-year-long round-the-clock measurements of the spectral transmittance of the atmosphere on a 1 km long horizontal near-ground path are discussed. The measurements were carried out in the suburb of Tomsk from March to October in 1997 - 2017. More than 10000 hourly average spectral aerosol extinction coefficients beta(lambda) were obtained in the wavelength range from 0.45 to 3.9 mu m. The interannual and interseasonal variability of the components of the aerosol extinction is studied. The most probable values of the coefficients beta(lambda), which can be characterized as background for this region, are estimated. These values at the wavelengths of 0.45, 0.55, 1.06 and 3.9 mu m are: 150, 100, 65 and 45 Mm(-1), respectively. The interannual differences of the most probable and annual average values of the aerosol extinction coefficients are shown.