The NOAA/CMDL sampling site in the Azores is located on Terceira Islands and is operated in cooperation with the 7th Weather Wing of the U.S. Air Force. The NOAA/CMDL flask data from the Azores show an increase in the annual mixing ratio from 339.0 parts per million (ppm) in 1980 to 355.9 ppm in 1991, or 1.54 ppm per year. Conway et al. (1994) reported a global growth rate of 1.43 ppm per year during 1981-92 for all NOAA/CMDL flask-sampling sites. Conway et al. (1988) found that the average peak-to-peak amplitude at the Terceira Islands sampling site during 1981-84 was 10.15 ppm. Unlike the majority of stations in the NOAA/CMDL flask-sampling network during 1981-84, the data from the Azores did not show a growth rate minimum in 1982 and a growth rate maximum in 1983. Instead, the data from the Terceira Islands sampling site exhibited large oscillations in growth rate throughout the data record.
Date revised 4/10/95 (gg)
records from sites in the NOAA/CMDL air
sampling network. In
T.A. Boden, D.P. Kaiser, R.J. Sepanski, and F.W. Stoss (eds.),
Trends '93: A Compendium of Data on Global Change. ORNL/CDIAC-65.
Carbon Dioxide Information Analysis Center, Oak Ridge National
Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A.
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