Two-Component Optical Model of Stratospheric Aerosol and Its Application to Interpretation of Lidar Measurements
摘要
Biomass burning aerosol has a significant effect on radiation properties of the stratosphere. Some known data about this aerosol type pertain to the cases of dense and altitudinally localized aerosol layers. Optical properties of its background component remain unknown. The processing of two-wavelength (355 and 532 nm) lidar measurements in Obninsk over 2012–2023 was performed to determine them. Lidar data interpretation is based on a two-component model of stratospheric aerosol proposed in this work. Along with the main component (sulfuric acid aerosol), biomass burning aerosol (brown carbon) is considered. As a result, the optical thickness of brown carbon aerosol in the 10–30 km layer is estimated at ∼0.012 and 0.0013 for attenuation at 355 and 532 nm and ∼7.1 × 10−3 and 3.5 × 10−4 for absorption at the same wavelengths. The results can be used in the development of advanced radiation models of the stratosphere.