The sampling site at Mould Bay is operated in cooperation with the Atmospheric Environment Service of Environment Canada. The NOAA/CMDL flask data from Mould Bay show an increase in the annual value from 341.9 parts per million (ppm) in 1981 to 357.4 ppm in 1992, or 1.41 ppm per year. A notable feature of the Mould Bay record is the slight decline in the annual atmospheric CO2 mixing ratio from 1991 to 1992. Conway et al. (1994) reported a growth rate of 1.43 ppm per year for all the NOAA/CMDL flask sampling sites during 1981-92. The Mould Bay record supports Conway et al. (1988, 1994) finding that global measurements of CO2 at remote locations have shown that during the winter in the Northern Hemisphere, mixing ratios of CO2 are highest at high latitudes, and they decrease toward the equator. Atmospheric CO2 concentrations at Mould Bay show a seasonal pattern, with the annual minimum occurring in August and the annual maximum occurring in March-May. Conway et al. (1994) reported that the peak-to-peak seasonal amplitude for Mould Bay was 15.9 ppm during 1981-92.
Date revised 4/10/95 (gg)
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