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Proceedings Paper

A direct detection 1.6μm DIAL with three wavelengths for high accuracy measurements of vertical CO2 concentration and temperature profiles
Author(s): Yasukuni Shibata; Chikao Nagasawa; Makoto Abo
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Paper Abstract

The accurate vertical CO2 profiles in the troposphere are highly desirable in the inverse techniques to improve quantification and understanding of the global budget of CO2 and also global climate changes. Moreover, wind information is an important parameter for transport simulations and inverse estimation of surface CO2 flux. A differential absorption lidar (DIAL) is an attractive method for obtaining vertical CO2 profiles and we have developed an 1.6μm DIAL system to perform simultaneous measurements of CO2 concentration, atmospheric temperature profile and wind profile. The absorption cross sections of gas and air density depends on atmospheric temperature and pressure. Then precise temperature and pressure profiles are necessary for accurate CO2 mixing ratio measurement by DIAL. Laser beams of three wavelengths around a CO2 absorption line are transmitted alternately to the atmosphere for simultaneous measurements of CO2 concentration and temperature. The receiving optics include the near-infrared photomultiplier tube and a fiber Bragg grating (FBG) filter to detect a Doppler shift.

Paper Details

Date Published: 22 October 2013
PDF: 7 pages
Proc. SPIE 8894, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing IX, 889406 (22 October 2013); doi: 10.1117/12.2029359
Show Author Affiliations
Yasukuni Shibata, Tokyo Metropolitan Univ. (Japan)
Chikao Nagasawa, Tokyo Metropolitan Univ. (Japan)
Makoto Abo, Tokyo Metropolitan Univ. (Japan)

Published in SPIE Proceedings Vol. 8894:
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing IX
Upendra N. Singh; Gelsomina Pappalardo, Editor(s)

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