Abstract
Different microphysical, optical and radiative properties of aerosol were analyzed according to the 10 years of measurements (2001–2010) at the Meteorological Observatory of Moscow State University within the framework of international AERONET program. Volume aerosol size distribution was shown to have a bimodal character with dominating the fine mode aerosol particles at effective radius of r eff-fine =0.15 µm. In smoke conditions reff-fine was shown to increase to 0.25 µm at extremely large aerosol optical thickness (AOT). Real and imaginary parts of refractive index are characterized by REFR=1.45, REFI=0.01 respectively, changing to REFR=1.49, REFI=0.006 for smoke aerosol. AOT seasonal changes are characterized by the increase towards warm period with a local minimum in June. The joint analysis of aerosol characteristics with the NOAA_NCEP_CPC_CAMS_OPI climatology shows the nature of these changes. For typical conditions aerosol single scattering albedo (SSA) is about 0.9 at 675 nm and is characterized by a distinct decrease with wavelength while in forest fires conditions it is significantly higher (SSA=0.95). The interaction between volume aerosol concentration of different aerosol fractions was obtained with a distinct decrease of variation towards large aerosol content.
Highlights
Atmospheric aerosols are one of the important factors influencing net radiative balance of the atmosphere and the whole climate system
Accurate multi-channel measurements by CIMEL sun/sky photometer through UV to near-infrared spectral region provide the data for evaluating a spectral dependence of aerosol optical thickness as well as many other inversion products including size distribution, effective radii, aerosol phase function, and different optical and radiative aerosol properties – refractive index, aerosol optical thickness, single scattering albedo, gi111.indd 19
Meteorological Observatory of Moscow State University (MSU MO) joined the AERONET program in 2001, and since that time regular high quality spectral measurements of aerosol characteristics have been in operation with the instruments calibrated according to the international standards
Summary
Atmospheric aerosols are one of the important factors influencing net radiative balance of the atmosphere and the whole climate system. Still there is not enough information on microphysical, optical and radiative aerosol properties which can cause different climate impact even in sign. Accurate multi-channel measurements by CIMEL sun/sky photometer through UV to near-infrared spectral region provide the data for evaluating a spectral dependence of aerosol optical thickness as well as many other inversion products including size distribution, effective radii, aerosol phase function, and different optical and radiative aerosol properties – refractive index, aerosol optical thickness, single scattering albedo, gi111.indd 19. Meteorological Observatory of Moscow State University (MSU MO) joined the AERONET program in 2001, and since that time regular high quality spectral measurements of aerosol characteristics have been in operation with the instruments calibrated according to the international standards. The 10-year period of continuous measurements provides an excellent dataset for the analysis of different aerosol properties in Moscow. In this paper we analyze typical features of main aerosol parameters, its climatology and some aspects of aerosol characteristics during the severe fire events
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