Atmospheric carbon dioxide records from sites in the NOAA/CMDL air
sampling network
ALERT
Trends
The NOAA/CMDL sampling site at Alert is operated in cooperation
with the Atmospheric Environment Service (AES) of Environment
Canada. The NOAA/CMDL flask data from Alert show an increase in the
annual mixing ratio from 348.4 parts per million (ppm) in 1986 to
357.6 ppm in 1992. Conway et al. (1994) reported a mean global
growth rate of 1.4 ppm per year based on the NOAA/CMDL flask
network data from 1981 to 1992. Trivett and Higuchi (1989) reported
an annual growth rate of 1.49 ppm based on the AES flask sampling
program at Alert. Alert is the northernmost site in the NOAA/CMDL
network. The Alert data are consistent with previous results
(Komhyr et al. 1985a; Conway et al. 1988) showing that annual mean
CO
mixing ratios are highest at high northern latitudes and
decrease toward the equator.
Alert, Northwest Territories, Canada
Tundra
82°27' N, 62°31'W
210 m above MSL
Alert Graph
Monthy atmospheric CO mixing ratios at Alert.
Alert Table
CO mixing ratios at Alert (ppm)
Access to Digital Data
Amsterdam 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)
