We used a global chemical transport model GEOS-Chem to compute monthly mean fine, coarse, and total aerosol volume concentration for Minsk and Kyiv in the period from 2010 to 2015. We compared results of the model simulation with sun-photometer observations at the ground-based AERONET network sites. We obtained that the aerosol volume concentrations retrieved from observations are in reasonably good agreement with model-simulated ones. However, the agreement is not good enough for the validation of the satellite measurements in the future space mission Aerosol-UA by the GEOS-Chem model simulation. To improve the accuracy of estimating the spatial-temporal distribution of the aerosol volume concentration we decided to apply the optimal interpolation method for assimilating AERONET data in GEOS-Chem model. The temporal correlation function for fine aerosol volume concentration is obtained on the basis of measurements at AERONET Minsk site over the 2002-2015 period and Kyiv site over the 2008-2015 period. We describe the analyzed values of fine aerosol volume concentration at all temporal grid points over the period of 2002 to 2015 for Minsk site and of 2008 to 2015 for Kyiv site, which were determined on the basis of the optimal interpolation method. We propose to use the optimal averaging method for AERONET data on the basis of the temporal optimization interpolation method.
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Miatselskaya et al. (2017) studied this question.
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