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

MAUNA LOA

Trends

The NOAA/CMDL flask data from Mauna Loa show an increase in the annual value from 325.3 parts per million (ppm) in 1970 to 356.4 ppm in 1992, or 1.41 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 Mauna Loa show a seasonal pattern: the annual minimum occurs in September-October, and the annual maximum occurs in May. Conway et al. (1994) reported that the peak-to-peak seasonal amplitude for Mauna Loa was 6.9 ppm during 1981-92.

Mauna Loa, Hawaii, U.S.A.
Barren volcanic slope
19°32' N, 155°35' W
3397 m above MSL

Mauna Loa Graph

Monthly atmospheric CO₂ mixing ratios at Mauna Loa.

Mauna Loa Table

CO₂ mixing ratios at Mauna Loa (ppm)

Access to Digital Data

Midway Islands 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)