Atmospheric carbon dioxide records from sites in the NOAA/CMDL air
sampling network
ASCENSION ISLAND
Trends
The sampling site on Ascension Island is operated in cooperation
with the U.S. Air Force and Pan American World Airways. The
NOAA/CMDL flask data from Ascension Island show an increase in the
annual value from 338.8 parts per million (ppm) in 1980 to
355.2 ppm in 1992, or 1.37 ppm per year. Conway et al. (1994)
reported a 1.43-ppm per year mean annual growth rate during 1981?92
for all NOAA/CMDL flask sampling sites.
Atmospheric CO
mixing ratios at Ascension Island show a seasonal
pattern. Conway et al. (1994) found that the seasonality at
Ascension Island does not appear to be affected by transport of
northern air and reported the peak-to-trough seasonal amplitude for
Ascension Island was 2.0 ppm for 1981?92.
Ascension Island, U.K. Territory
South Atlantic Ocean
Island seashore
7°55' S, 14°25' W
54 m above MSL
Ascension Island Graph
Monthly atmospheric CO mixing ratios at Ascension Island.
Ascension Island Table
CO mixing ratios at Ascension Island (ppm)
Access to Digital Data
Azores Trends
References
Methods
CITE AS: Conway, T.J., P.P. Tans, and L.S. Waterman.
1994. Atmospheric CO 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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Date revised 4/10/95 (gg)
