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Proceedings Paper

Long-path differential absorption measurements of tropospheric molecules
Author(s): Jerald W. Harder; George H. Mount
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Paper Abstract

The measurement of the important atmospheric molecules O3, NO2, CH2O, H2O, NO3, and HONO can be measured using long path differential absorption spectroscopy. The experiment is located at the Fritz Peak Observatory, 17 km west of Boulder, Colorado. This site permits both the measurement of clean continental air during times of westerly air flow, as well as polluted urban air during easterly up-slope episodes. The spectrograph used in this study is a low resolution double crossed Czerny-Turner, with a well matched receiving telescope. This spectrograph uses a 1 x 1024 element Reticon diode array detector to measure the molecular absorption spectra of these molecules in 40 nm bands in the near ultraviolet-visible region. The total optical path for this experiment is 20.6 km, and the path is folded by a 121 element retroreflector array thereby allowing the light source and spectrograph to be in the same location. Deduction of atmospheric concentrations these molecules over this path is accomplished by using a least squares procedure that employs the method of singular-value decomposition.

Paper Details

Date Published: 1 September 1991
PDF: 10 pages
Proc. SPIE 1491, Remote Sensing of Atmospheric Chemistry, (1 September 1991); doi: 10.1117/12.46644
Show Author Affiliations
Jerald W. Harder, CIRES/Univ. of Colorado and Aeronomy Lab./NOAA (United States)
George H. Mount, Aeronomy Lab./NOAA (United States)

Published in SPIE Proceedings Vol. 1491:
Remote Sensing of Atmospheric Chemistry
James L. McElroy; Robert J. McNeal, Editor(s)

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