Publication Date:
2019-07-13
Description:
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 approx.6300/cm and O2 at approx.7900/cm 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 avenge rate of 1.49 +/- 0.04 ppmv/yr with seasonal variations of approx.7 ppmv peak-to-peak. Our retrievals demonstrate that this remote technique is capable of precisions better than 0.5%.
Keywords:
Solar Physics
Type:
Geophysical Research Letters (ISSN 0094-8276); 29; 9; 53-1
Format:
text
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