Monthly atmospheric CO2 record from Shemya Island, Alaska, U.S.A.

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


Shemya Island, Alaska, U.S.A.
Island seashore
52°72' N, 174°10' E
40 m above MSL


The monitoring site at Shemya Island, Alaska, is operated in cooperation with the PIQUNIQ Management Corporation. Annual atmospheric CO2 mixing ratios at Shemya Island have risen from 349.22 parts per million (ppm) in 1986 to 374.15 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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