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Atmospheric CO2 From Continuous Air Samples at La Jolla Pier, California, U.S.A.

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

November 1972 - October 1975


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 six hours of continuous sampling. Data are available from most weeks during the 3-year period of record.

Map showing location of La Jolla Pier, California, U.S.A.

La Jolla Pier, California, U.S.A.
32°9' N, 117°3' W
10 m above MSL


The annual range of about 10-12 ppmv, and the shape of the annual wave, are well defined by these weekly data. While an upward trend is evident, three years of data do not show it as well as 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.