Application of the CHIMERE-WRF model complex to study the radiative effects of Siberian biomass burning aerosol in the eastern Arctic
I.B. Konovalov1, N.A. Golovushkin1, T.B. Zhuravleva2, I.M. Nasrtdinov2, V.N. Uzhegov2, M. Beekmann3
1Федеральный Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), Nizhny Novgorod, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
3Laboratoire Interuniversitaire des SystГЁmes AtmosphГ©riques, Creteil Cedex, France
Keywords: aerosol, smoke, chemistry-transport model, aerosol-radiation interaction
Abstract
A computational technology for studying aerosol-radiation interactions and calculating regional estimates of the direct and semi-direct radiative effects of biomass burning (BB) aerosol based on calculations with the CHIMERE chemistry-transport model coupled to the WRF meteorological model is described. The technology was applied to the numerical study of the radiative effects of Siberian BB aerosol in the eastern Arctic in the period of July 16-31, 2016. The simulation results show that Siberian BB aerosol had a significant cooling effect on the atmosphere in the eastern Arctic in that period due to the direct radiative effect (DRE), the value of which at top of the atmosphere was, on average, -6.0 W × m-2, being minimal over the snow-ice cover of the ocean (-1.2 W × m-2). At the same time, it is found that the contribution of the Siberian BB aerosol DRE to the radiative balance of the Arctic atmosphere is compensated to a certain extent by the semi-direct radiative effect (SDRE), which is positive on average (2.0 W × m-2). The SDRE is formed as a result of the aerosol feedback on meteorology during many hours of the evolution of the atmosphere and plays the most important role over the snow-ice cover, where it exceeds the DRE in absolute value. It has been shown that the SDRE of Siberian BB aerosol in the performed numerical experiments is mainly due to the process of scattering (rather than absorption) of radiation by aerosol particles.
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