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Proceedings Paper

Minimization of systematic errors at lidar profile restitution of atmospheric gas concentrations by the differential absorption method
Author(s): O. A. Romanovskii
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Paper Abstract

This work aims at studying the sources of the errors in restitution of atmospheric gas concentration profiles and the methods to minimize them. It is seen that the water vapor absorption line contour is significantly distorted by the apparatus function of the laser source positioned at the altitudes above 5 km. the results of performed numerical calculations with the model absorption lines show that it is more efficient to use the less intensive absorption lines. The studies of temperature sensitivity show that it is more reasonable to use the less intensive absorption lines. It is seen that the use in sensing of intensive lines of water vapor absorption at S0= 0.5 cm-1/g cm-2 leads to significant errors in a priori calculations of the absorption coefficient profile due to the influence of humidity variations at ΔVe> 0.03 cm-1 in winter and especially in summer. At S0= 0.1 cm-1 /g cm-2 and Δυe < 0.03 cm-1, errors practically do not exceed 1 percent for almost the entire altitudinal interval of 0-10 km. We have established that disregard to the measured line shift of water vapor absorption, which equals 694.38 nm, and calculated CO absorption line shift, 2086.322 cm-1, at the system tuned into the centre of the Lorentz contour of H20 and CO absorption lines, results in the errors that reach 20% at the altitude of 15 km. At the tuning into the Doppler contour, errors are largest in the ground layer (2-3%) and become smaller with the altitude.

Paper Details

Date Published: 21 April 2006
PDF: 7 pages
Proc. SPIE 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 61602Q (21 April 2006); doi: 10.1117/12.675902
Show Author Affiliations
O. A. Romanovskii, Institute of Atmospheric Optics (Russia)

Published in SPIE Proceedings Vol. 6160:
Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics
Gelii A. Zherebtsov; Gennadii G. Matvienko, Editor(s)

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