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

KEY BISCAYNE

Trends

The sampling site at Key Biscayne, Florida, is operated in cooperation with the NOAA Atlantic Oceanographic and Meteorological Laboratory. The NOAA/CMDL flask data from Key Biscayne show an increase in the annual mixing ratio from 330.8 parts per million (ppm) in 1973 to 357.4 ppm in 1992 or 1.4 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 Key Biscayne show a seasonal pattern: the annual minimum occurs in the late northern summer or early fall; the annual maximum, in April-May. Conway et al. (1994) found that the peak-to-trough amplitude for the seasonal cycle at Key Biscayne was 8.0 ppm during 1981-92.

Key Biscayne, Florida, U.S.A.
Coastal island seashore
24°40' N, 80°12' W
3 m above MSL

Key Biscayne Graph

Monthly atmospheric CO₂ mixing ratios at Key Biscayne.

Key Biscayne Table

CO₂ mixing ratios at Key Biscayne (ppm)

Access to Digital Data

Mace Head 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)