Atmospheric carbon dioxide records from sites in the NOAA/CMDL air sampling network

CAPE KUMUKAHI

Trends

The NOAA/CMDL flask data from Cape Kumukahi show an increase in the annual value from 334.3 parts per million (ppm) in 1977 to 356.3 ppm in 1992 or 1.47 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.

Atmospheric CO₂ concentrations at Cape Kumukahi show a seasonal pattern: the annual minimum mixing ratios are recorded in September, and the annual buildup occurs in the spring. Conway et al. (1994) reported that the peak-to-trough seasonal amplitude for Cape Kumukahi was 8.5 ppm during 1981-92.

Cape Kumukahi, Hawaii, U.S.A.
Island seashore
19°31' N, 154°49' W
3 m above MSL

Cape Kumukahi Graph

Monthly atmospheric CO₂ mixing ratios at Cape Kumukahi.

Cape Kumukahi Table

CO₂ mixing ratios at Cape Kumukahi (ppm)

Access to Digital Data

Cape Meares Trends

References

Methods

CITE AS: Conway, T.J., P.P. Tans, and L.S. Waterman. 1994. Atmospheric CO₂ 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)