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Study of aerosol in near-surface layer of the marine and coastal atmosphere by the methods of microphysical and optical measurements, analysis, and simulation
Author(s): G. A. Kaloshin
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Paper Abstract

MaexPro model of aerosol of near-surface layer of the marine and coastal atmosphere is presented, which is based on long-term observations of particle distribution in the size range 0.01-100 μm. A key feature of the model is that the amplitudes and widths of aerosol modes of the particle size distribution functions (PSDF) are simulated as functions of fetch (X) and wind speed (U). The shape of PSDF and its dependence on the altitude above sea level (H) and relative humidity (RH) are studied. A formula is derived for the altitude profile of aerosol extinction coefficient ε(λ), related to altitude profile of growth function. The ε(λ) spectra are shown to strongly vary for different H, with the largest ε(λ) change occurring in the altitude range H=0-10 m, which is a consequence of gravity effect on the medium-sized and coarse fractions of SSA particles. The model makes it possible to obtain quantitative data on the complex refractive indices of SSA particles for different RH in the wavelength range from 0.2 to 16 μm. The model applicability region was found to be in the following altitude, wind speed, fetch, and relative humidity ranges respectively: H = 0-25 m, U = 3-18 km s-1, X ≤ 120 km, and RH = 40-98%.

Paper Details

Date Published: 13 December 2018
PDF: 6 pages
Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 1083348 (13 December 2018); doi: 10.1117/12.2504175
Show Author Affiliations
G. A. Kaloshin, V.E. Zuev Institute of Atmospheric Optics (Russian Federation)


Published in SPIE Proceedings Vol. 10833:
24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics
Gennadii G. Matvienko; Oleg A. Romanovskii, Editor(s)

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