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

SEYCHELLES

Trends

The Seychelles sampling site on Mahé Island is operated in cooperation with the Physical Science Laboratory at New Mexico State University. The NOAA/CMDL flask data from the Seychelles show an increase in the annual atmospheric CO mixing ratio from 339.4 parts per million (ppm) in 1980 to 354.8 ppm in 1992, or 1.28 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 COconcentrations at the Seychelles show a seasonal pattern: the annual minimum typically occurs in May or June, and the annual maximum occurs in February-March. Conway et al. (1994) reported that the peak-to-peak seasonal amplitude for the Seychelles site was 3.5 ppm for 1981-92.

Seychelles (Mahé Island)
Indian Ocean island seashore
4°40' S, 55°10' E
3 m above MSL

Seychelles Graph

Monthly atmospheric CO mixing ratios at the Seychelles.

Seychelles Table

CO mixing ratios at Seychelles (ppm)

Access to Digital Data

Shemya Island 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)