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. In this paper we assessed the influence of biomass burningduring forest fires throughout summer (1 June–31 August) 2010 on aerosolabundance, dynamics, and its properties over Ukraine. We also consideredinfluences and effects over neighboring countries: EuropeanRussia, Estonia, Belarus, Poland, Moldova, and Romania. We used MODIS satellite instrument data to study fire distribution. We alsoused ground-based remote measurements from the international sun photometernetwork AERONET plus MODIS and CALIOP satellite instrument data todetermine the aerosol content and optical properties in the atmosphere overEastern Europe. We applied the HYSPLIT model to investigate atmospheric dynamicsand model pathways of particle transport. As with previous studies, we found that the highest aerosol content wasobserved over Moscow in the first half of August 2010 due to the proximity ofthe most active fires. Large temporal variability of the aerosol content withpronounced pollution peaks during 7–17 August was observed at the Ukrainian(Kyiv and Sevastopol), Belarusian (Minsk), Estonian (Toravere), and Romanian(Bucharest) AERONET sites. We analyzed aerosol spatiotemporal distribution over Ukraine using MODIS AOD550 nm and further compared with the Kyiv AERONET site sun photometermeasurements; we also compared CALIOP AOD 532 nm with MODIS AOD data. Weanalyzed vertical distribution of aerosol extinction at 532 nm, retrievedfrom CALIOP measurements, for the territory of Ukraine at locations wherehigh AOD values were observed during intense fires. We estimated theinfluence of fires on the spectral single scattering albedo, size distribution, and complexrefractive indices using Kyiv AERONET measurements performed during summer2010. In this study we showed that the maximum AOD in the atmosphere over Ukrainerecorded in summer 2010 was caused by particle transport from the forestfires in Russia. Those fires caused the highest AOD 500 nm over the Kyivsite, which in August 2010 exceeded multiannual monthly mean for the entireobservational period (2008–2016, excluding 2010) by a factor of 2.2. Also,the influence of fires resulted in a change of the particle microphysics inthe polluted regions.

Increased aerosol content in the atmosphere over Ukraine during summer 2010