Monthly atmospheric CO2 record from Sand Island, Midway, 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


Sand Island, Midway, U.S.A.
Pacific Ocean island seashore
28°21' N, 177°38' W
7.7 m above MSL


The sampling site on Sand Island, Midway, U.S.A. is operated in cooperation with the U.S. Fish and Wildlife Service. The NOAA/CMDL flask data from Sand Island show an increase in atmospheric CO2 mixing ratios from 348.0 parts per million (ppm) in 1986 to 373.25 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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