Vol. 29, issue 12, article # 5

Abstract:

Lidar polarization measurements of stratospheric (10–40 km) aerosol parameters were fulfilled over Obninsk in 2012–2015. Over 300 altitude profiles of the aerosol backscattering coefficient at 532 nm wavelength were obtained. Parameters of aerosol backscattering measured are generally close to known background values. An increased content of spherical aerosol near tropopause was revealed in spring 2013; it was probably caused by sedimentation of Chelyabinsk meteorite aerosol. Layers of increased aerosol backscattering were observed at 10–15 km levels in July 2014 and July 2015, appeared as a result of transcontinental aerosol transfer from Canadian forest fires. Estimates of integral parameters of backscattering and extinction were made for the lower (from tropopause level to 15 km) and middle (from 15 to 30 km) aerosol layers. It is shown that the contributions of the lower layer in the above optical parameters are 1.8 and 1.6 times higher than those of the middle layer.

Keywords:

stratosphere, lidar, aerosol, backscattering, optical depth, Chelyabinsk meteorite

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