Monthly atmospheric CO2 record from Ascension Island, United Kingdom

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


Ascension Island, U.K. Territory
South Atlantic Ocean
Island seashore
7°92' S, 14°42' W
54 m above MSL


The sampling site on Ascension Island is operated in cooperation with the U.S. Air Force and Computer Science Raytheon. The NOAA/CMDL flask data from Ascension Island show an increase in the annual value from 338.83 parts per million (ppm) in 1980 to 371.75 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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