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Atmospheric CO2 from Continuous Air Samples at the South Pole

graphics Graphics   data Data

C.D. Keeling and T.P. Whorf

Carbon Dioxide Research Group, Scripps Institution of Oceanography, University of California, La Jolla, California 92093-0444, U.S.A.

Period of Record

June 1960 - October 1963


An Applied Physics Corporation (APC) nondispersive infrared gas analyzer was used in the field to obtain atmospheric CO2 concentrations, based on continuous data for 6-hour steady periods. Weekly averages were calculated from those daily averages meeting the requirement for at least 6 hours of continuous sampling. Data are available from most weeks during the 3-year period of record.

Map showing location of the South Pole, Antarctica

South Pole, Antarctica
Ice- and snow-covered plateau
89°59' S, 24°48' W
2810 m above MSL


The annual range of about 1.5 ppmv, and an increase of roughly 1 ppmv/year are evident over the period of record. The upward trend is better displayed by SIO's PDF monthly averaged data.


CITE AS: Keeling, C.D. and T.P. Whorf. 2004. Atmospheric CO2 concentrations derived from flask air samples at sites in the SIO network. 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, Tennessee, U.S.A.