Retrieval of the vertical distribution of aerosol microphysical characteristics from lidar measurements in Tomsk

S. V. Samoilova; I. E. Penner; G. P. Kokhanenko

doi:10.1117/12.2504469

13 December 2018 Retrieval of the vertical distribution of aerosol microphysical characteristics from lidar measurements in Tomsk

S. V. Samoilova, I. E. Penner, G. P. Kokhanenko

Author Affiliations +

Proceedings Volume 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 1083358 (2018) https://doi.org/10.1117/12.2504469
Event: XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2018, Tomsk, Russian Federation

Abstract

Regular lidar measurements of the vertical distribution of aerosol optical parameters are carried out in Tomsk (56°N, 85°E) since April, 2006. A method is proposed for joint determination of two aerosol microphysical characteristics: the complex refractive index m=m_real + i*m_image and the spherical-particle size distribution function U(r) from the data of the nighttime vertical lidar sensing at the wavelengths 355-1064 nm. Section 2 is devoted to the theoretical aspects of retrieving the size distribution function U(r) assuming a known complex refractive index m. It is shown that the coarse fraction cannot be retrieved unambiguously. The statistical regularization method offers an unambiguous estimation of U(r) for the mean radius up to 3 μm, and gives an admissible estimate for larger radii. When estimating U(r) and m together (section 3), the retrieved refractive index is non-linearly related to the optical coefficients and the distribution function, which leads to appearance of different, including false values of m. A simultaneous use of several functionals gives a better estimate of m due to different sets of the respective optical characteristics.

Citation Download Citation

S. V. Samoilova, I. E. Penner, and G. P. Kokhanenko "Retrieval of the vertical distribution of aerosol microphysical characteristics from lidar measurements in Tomsk", Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 1083358 (13 December 2018); https://doi.org/10.1117/12.2504469

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