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Atmospheric and Oceanic Optics

2019 year, number 2

Effect of the internal structure of particles on optical properties of stratospheric aerosol, its radiative forcing, and average global mean surface temperature

V.A. Frolkis1,2, A.M. Kokorin3
1The Voeikov Main Geophysical Observatory, 7, Karbyshev street, 194021, St Petersburg
2Saint-Petersburg State University of Economics, 21, Sadovaya street, 191023, St. Petersburg
3Saint Petersburg State University of Architecture and Civil Engineering, 4, Vtoraya Krasnoarmeiskaya ul., Saint Petersburg, Russia, 190005
Keywords: стратосферный сульфатный аэрозоль, двухслойные, просветленные, квазиоднородные и однородные частицы, оптические свойства, мгновенный радиационный форсинг, парниковый и антипарниковый эффекты, радиационная температура поверхности, компенсация парникового потепления, геоэнжиниринг, stratospheric sulphate aerosol, two-layer, enlightened, quasi-homogeneous and homogeneous aerosol particles, optical property, instantaneous radiative forcing, greenhouse and anti-greenhouse effects, greenhouse gas compensation, geo-engineering


Single-phase and two-phase aerosol particles are considered. The influence of their structure and size distribution parameters on the optical characteristics of the stratospheric sulphate aerosol layer is simulated. The single-phase aerosol includes homogeneous particles, which are a liquid drop of 75% sulphuric acid, and the two-phase aerosol are drops of sulphuric acid with dissolved inorganic impurities. It is assumed that the latter can be two-layer, enlightened, and quasi-homogeneous. The dependence of instantaneous radiative forcing and radiative changes of surface temperature on the internal structure of stratospheric sulphate aerosol particles and the parameters of their size distribution is simulated. An aerosol layer with an optical thickness equal to 0.05 in the visible range is considered. Its particles can lead to the greenhouse and anti-greenhouse effects. Ensembles of two-layer particles with narrow size distributions, and ensembles with wider distributions and average radii not exceeding 0.25 ¸ 0.40 mm, create the anti-greenhouse effect on the order of 4 ¸ 8 W/m2, whereas for large average radii and wide distributions, occurring greenhouse effect (2 ¸ 6 W/m2) occurs.