Analysis on characteristics of optical turbulence under different stability conditions above the sea surface

Feifei Wang; Kun Zhang; Tao Luo; Xuebin Li

doi:10.1117/12.2625824

27 March 2022 Analysis on characteristics of optical turbulence under different stability conditions above the sea surface

Feifei Wang, Kun Zhang, Tao Luo, Xuebin Li

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Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169A4 (2022) https://doi.org/10.1117/12.2625824
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Atmospheric stability characterizes the intensity of vertical movement near the ground. Monin- Obukhov length is the most commonly used also most important stability parameter in boundary layer theory, which can be calculated by the dimensional analysis method on the basis of the similarity theory of the near-surface layer. The M-O parameter ζ is often used to characterize the stability (the ratio of height to M-O length). When the atmospheric stratification is neutral, ζ=0; when the atmospheric stratification is stable, ζ>0, and the larger the value, the more stable the atmosphere; When the atmosphere stratification is unstable, ζ<0, and the smaller the value, the more unstable the atmosphere. Using the three-dimensional wind speed data of the ship-borne three-dimensional ultrasonic anemometer and the meteorological data observed by the automatic weather station, combined with similar theory, to analyze the atmospheric stability parameter ζ above the sea surface. The results show that the atmospheric stability has an obvious diurnal variation trend, the night atmosphere is mostly stable, and the atmospheric turbulence is vigorous at noon. Besides, using three-dimensional ultrasonic wind speed data combined with virtual temperature correction, the atmospheric refractive index structure constant is calculated and compared with the measured value of the micro-thermal meter. This paper also analyzes the values of friction velocity 𝒖𝒖∗, characteristic temperature 𝑻𝑻∗ , characteristic humidity 𝑸𝑸∗ and atmospheric refractive index structure constant C_n² under different stability conditions to understand the changing characteristics of optical turbulence on the underlying surface of the ocean.

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Feifei Wang, Kun Zhang, Tao Luo, and Xuebin Li "Analysis on characteristics of optical turbulence under different stability conditions above the sea surface", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169A4 (27 March 2022); https://doi.org/10.1117/12.2625824

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KEYWORDS

Ultrasonics

Temperature metrology

Optical turbulence

Turbulence

Refractive index

Atmospheric corrections

Atmospheric optics

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