ИСТИНА

The study of cloud and aerosol effects on radiative fluxes and meteorological parameters has been fulfilled using the numerical weather prediction COSMO-Ru system and accurate aerosol and cloud optical and microphysical measurements as well as radiative and meteorological datasets. We analyze different geographical regions of Northern Eurasia including the Moscow State University Meteorological Observatory (Russia) and Lindenberg Meteorological Observatory (Germany), Bet-Dagan-Nes-Ziona and Eilat-Yotvata sites (Israel), the International Hydrometeorological Observatory of Tiksi (Russia) and Pyeongchang (Republic of Korea). The analysis was performed for clear-sky and cloudy conditions. For clear sky conditions the main objective was to evaluate the efficacy of the application of the new aerosol MACv2 climatology (Kinne et al., 2013), which has been recently implemented in the COSMO model. In general, an average uncertainty in solar irradiance due to application of the Macv2 climatology is less than 25 W/m2. Over northern pristine areas the Macv2 aerosol characteristics are similar to the old Tegen climatology, that results in negligible radiative and temperature differences. However, meaningful difference in aerosol parameters is observed over European part of Russia, southern Europe, Asia and Israel, especially, over desert/semi desert areas with prevailing mineral dust aerosol. Over these areas Macv2 climatology provides a better agreement with AERONET observations, while Tegen climatology significantly overestimates them. Usually, higher aerosol loading in the old Tegen climatology is compensated by the existing 4-5 % radiative flux overestimation in the COSMO RT code (Poliukhov et al., 2017). However, over desert areas this mechanism does not work and the difference between the modelled (with Macv2 dataset) and the observed radiative fluxes significantly increases. We also discuss the comparisons of the new ICON-ART simulations over this desert/semi desert area with ground-based observations and COSMO-Ru model runs. For cloudy conditions the comparisons were made between simulations with the standard and the new COSMO cloud/aerosol scheme, which accounts for aerosol/cloud interaction (Blahak, Muskatel, Khain, 2018) over Moscow, Lindenberg and Pyeongchang. We discussed some noticeable radiative feedbacks, temperature and precipitation effects due to the application of the new algorithm. Over Lindenberg we made also the comparisons of physical cloud parameters retrieved by the CLOUDNET project methods (Illingworth et al, 2007). The research was fulfilled under the umbrella of the T2(RC)2 COSMO priority project. The analysis of data over different sites in clear sky and cloudy conditions was made by Russian team from Moscow State University and Hydrometeorological Center with the support of the Russian Science Foundation, grant # 18-17-00149.