Atmospheric CO2 retrieved from ground-based near IR solar spectra

Details Atmospheric CO2 retrieved from ground-based near IR solar spectra Atmospheric CO2 retrieved from ground-based near IR solar spectra

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29i..53y&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 9, pp. 53-1, CiteID 1339, DOI 10.1029/2001GL014537

Physics

17

Atmospheric Composition And Structure: Geochemical Cycles, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Atmosphere (0315, 0325)

Scientific paper

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%.

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