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Title:LINE SHAPE PARAMETERS FOR NEAR INFRARED CO2 BANDS IN THE 1.61 AND 2.06 MICRON SPECTRAL REGIONS
Author(s):Devi, V. Malathy
Contributor(s):Mantz, Arlan; Smith, Mary Ann H.; Crawford, Timothy J; Brown, Linda; Sung, Keeyoon; Benner, D. Chris
Subject(s):Linelists
Abstract:Accurate spectroscopic measurements of self- and air-broadened Lorentz half-width and pressure-shift coefficients and their temperature dependence exponents are crucial for the Orbiting Carbon Observatory (OCO-2) mission.footnote {D. Crisp, B.M. Fisher, C. O�Dell, et.al., Atmos. Meas. Tech. Discuss 4 (2011) 1-59.} We therefore analyzed 73 high-resolution high signal-to-noise spectra of CO$_2$ and CO$_2$+air for OCO-2 channels at 1.61 and 2.06 $mu m$. These spectra were recorded at various spectral resolutions (0.004-0.013 cm$^{-1}$) using two spectrometers (the Kitt Peak FTS in Arizona and the Bruker 125HR FTS at the Jet Propulsion Laboratory in Pasadena, California). Six different absorption cells with path lengths between 0.2 and 121 m were used with gas samples at a range of temperatures (170-297 K). The gas pressures ranged from (0.3-898 Torr for pure sample and 26-924 Torr for mixtures of CO$_2$ and air with CO$_2$ volume mixing ratios between 0.01 and 0.4. The cold sample spectra were acquired using a short 0.2038 m straight pass celland a multipass Herriott cell having a 20.941 m total path A multispectrum fitting technique was employed to fit all the spectra simultaneously with a non-Voigt line shape profile including speed dependence and full line mixing. Examples of fitted spectra and retrieved parameters in both CO$_2$ band regions will be shown. Comparisons of some of the results with other published values will be provided.footnote {Research described in this paper are performed at the College of William and Mary, Jet Propulsion Laboratory, California Institute of Technology, NASA Langley Research Center and Connecticut College under contracts and cooperative agreements with the National Aeronautics and Space Administration.}
Issue Date:22-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79445
Date Available in IDEALS:2016-01-05


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