Anand, N and Sunilkumar, K and Adithya Kaushik, YA and Satheesh, SK and Krishna Moorthy, K (2021) Statistics of optical turbulence from multi-year sonic anemometer-thermometer observations at a semi-arid region: Effects of aerosols and atmospheric boundary layer dynamics. In: Laser Communication and Propagation through the Atmosphere and Oceans X 2021, 1-5 AUG 2021, San Diego.
Full text not available from this repository.Abstract
Accurate characterization of atmospheric refractive index fluctuations (optical turbulence) is important in applications such as Free-Space Optical (FSO) communication and laser remote sensing, where atmospheric optical propagation is involved. In this paper, we present the statistics of near-surface optical turbulence derived from three-year sonic anemometer-thermometer observations at a semi-arid, flat terrain in peninsular India. Using concurrent and collocated measurements of meteorological fields and atmospheric aerosols (both scattering and absorbing type), the role of atmospheric boundary layer dynamics and aerosols in modulating the magnitude, evolution, and temporal variations (over diurnal and seasonal scales) of refractive index structure parameter (Cn2) are discussed. Absorption of solar radiation and the resulting atmospheric heating by aerosol particles will modify the land-atmosphere temperature gradient that regulates the near-surface Cn2. We discuss such a scenario using aerosol black carbon measurements close to the surface of the Earth and highlight the crucial role of ABL dynamics in controlling the influence of such aerosol radiative heating effects on Cn2. These results will be helpful in improving the weather model simulations of optical turbulence over semi-arid regions. © 2021 SPIE.
| Item Type: | Conference Paper |
|---|---|
| Publication: | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher: | SPIE |
| Additional Information: | The copyright for this article belongs to SPIE |
| Keywords: | Anemometers; Arid regions; Atmospheric aerosols; Atmospheric boundary layer; Atmospheric turbulence; Optical communication; Refractive index; Remote sensing; Thermometers, Atmospheric refractive index; Boundary layer dynamics; Free Space Optical communication; Near surfaces; Optical lasers; Optical turbulence; Refractive index fluctuations; Semi-arid region; Sonic anemometer; Sonic anemometer-thermometer, Atmospheric thermodynamics |
| Department/Centre: | Division of Mechanical Sciences > Divecha Centre for Climate Change Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences |
| Date Deposited: | 26 Nov 2021 10:59 |
| Last Modified: | 26 Nov 2021 10:59 |
| URI: | http://eprints.iisc.ac.in/id/eprint/70461 |
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