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

MIDWAY ISLANDS

Trends

Annual averages derived from individual flask samples collected at the NOAA/CMDL sampling site on Sand Island, in the Midway Islands, have shown an increase in atmospheric CO₂ mixing ratios from 348.0 parts per million (ppm) in 1986 to 356.8 ppm in 1992, or 1.47 ppm per year. Monthly atmospheric CO₂ mixing ratios from Sand Island exhibit a seasonal pattern: annual minima occur in September; annual maxima, in April or May.

Midway Islands (Sand Island)
Pacific Ocean island seashore
28°13' N, 177°22' W
4 m above MSL

Midway Islands Graph

Monthly atmospheric CO₂ mixing ratios at Midway Islands.

Midway Islands Table

CO₂ mixing ratios at Midway Islands (ppm)

Access to Digital Data

Mould 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)