Atmospheric carbon dioxide records from sites in the NOAA/CMDL air sampling network

SHEMYA ISLAND

Trends

The monitoring site at Shemya Island, Alaska, is operated in cooperation with the U.S. Air Force. Annual atmospheric CO₂ mixing ratios at Shemya Island have risen from 349.3 parts per million (ppm) in 1986 to 357.2 ppm in 1992, or 1.32 ppm per year. The record from Shemya Island exhibits a seasonal cycle: the yearly minimum occurs in August; the yearly maximum, between the late winter and spring.

Shemya Island, Alaska, U.S.A.
Island seashore
52°43' N, 174°06' E
40 m above MSL

Shemya Island Graph

Monthly atmospheric CO₂ mixing ratios at Shemya Island.

Shemya Island Table

CO₂ mixing ratios at Shemya Island (ppm)

Access to Digital Data

South Pole Trends

References

Methods

CITE AS: Conway, T.J., P.P. Tans, and L.S. Waterman. 1994. Atmospheric CO₂ 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) .