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

GUAM

Trends

The NOAA/CMDL sampling site at Guam, in the Mariana Islands, is operated in cooperation with the University of Guam. The NOAA/CMDL flask data from Guam show an increase in the annual mixing ratio from 340.0 parts per million (ppm) in 1980 to 356.3 ppm in 1992, or 1.36 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 mixing ratios at Guam show a seasonal pattern: the annual drawdown typically occurs in September–October, and the annual maximum, in May. Conway et al. (1994) found that the average peak-to-peak amplitude for Guam from 1981-92 was 6.9 ppm.

Guam, Mariana Islands
U.S. Territory
Pacific Ocean island seashore
13°26' N, 144°47' E
2 m above MSL

Guam Graph

Monthly atmospheric CO₂ mixing ratios at Guam.

Guam Table

CO₂ mixing ratios at Guam (ppm)

Access to Digital Data

Halley Bay 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)