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GEOPHYSICAL RESEARCH LETTERS,
VOL. 29, NO. 9,
1339,
doi:10.1029/2001GL014537,
2002
Atmospheric CO2 retrieved from ground-based near IR solar spectra
Zhonghua Yang
Division of Geological and Planetary Sciences,
California Institute of Technology,
Pasadena,
CA,
USA
Geoffrey C. Toon
Jet Propulsion Laboratory,
California Institute of Technology,
Pasadena,
CA,
USA
Jack S. Margolis
Jet Propulsion Laboratory,
California Institute of Technology,
Pasadena,
CA,
USA
Paul O. Wennberg
Division of Geological and Planetary Sciences,
California Institute of Technology,
Pasadena,
CA,
USA Division of Engineering and Applied Science,
California Institute of Technology,
Pasadena,
CA,
USA
Abstract
The column-averaged volume mixing ratio (VMR) of CO2 over Kitt Peak, Arizona, has been retrieved from high-resolution solar absorption spectra obtained with the Fourier transform
spectrometer on the McMath telescope. Simultaneous column measurements of CO2 at ∼6300 cm−1 and O2 at ∼7900 cm−1 were ratioed to minimize systematic errors. These column ratios were then scaled by the mean O2 VMR (0.2095) to yield column-averaged vmrs of CO2. These display similar behavior to the Mauna Loa in situ surface measurements. During the period 1977–1995, the column-averaged
mixing ratio of CO2 increased at an average rate of 1.49 ± 0.04 ppmv/yr with seasonal variations of ∼7 ppmv peak-to-peak. Our retrievals demonstrate
that this remote technique is capable of precisions better than 0.5%.
Published 14
May
2002.
Index Terms: 0330 Atmospheric Composition and Structure: Geochemical cycles; 0394 Atmospheric Composition and Structure: Instruments and techniques; 1610 Global Change: Atmosphere (0315, 0325).
Read Full Article (file size: 2035229 bytes) Cited by
Citation: Yang, Z., G. C. Toon, J. S. Margolis, and P. O. Wennberg
(2002),
Atmospheric CO2 retrieved from ground-based near IR solar spectra,
Geophys. Res. Lett.,
29(9),
1339,
doi:10.1029/2001GL014537.
Copyright 2002 by the American Geophysical Union.
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