Monthly atmospheric CO2 record from Alert, Nunavut, Canada

Graphics Digital Data

Pieter P. Tans and Thomas J. Conway

NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, Colorado 80305, U.S.A.

Period of Record


Alert, Northwest Territories, Canada
Tundra (snow covered for almost
three quarters of the year)
82°45' N, 62°52' W
210 m above MSL


The NOAA/CMDL sampling site at Alert is operated in cooperation with Environment Canada and the Meteorological Service of Canada. The NOAA/CMDL flask data from Alert show an increase in the annual mixing ratio from 348.35 parts per million (ppm) in 1986 to 373.88 ppm in 2002.

CITE AS: Tans, Pieter P. and T.J. Conway, 2005. Monthly Atmospheric CO2 Mixing Ratios from the NOAA CMDL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2002. In Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A.

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