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Coastal Station: Adrigole
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The CSIRO archive of the Atmospheric Life Experiment (ALE) datasets which was designed to determine accurately the atmospheric concentrations of the four halocarbons CFCl3, CF2Cl2, CH3CCl3, and CCl4, and also of N2O with emphasis on measurement of their long-term trends in the atmosphere. Comparison of these concentrations and trends for the four halocarbons with estimates of their industrial emission rates then enabled calculations of their global circulation rates and globally averaged atmospheric lifetimes. The ALE project was the precursor of the GAGE (Global Atmospheric Gases Experiment) and thereafter AGAGE (Advanced Global Atmospheric Gases Experiment) global observing system that has been continuously measuring the composition of the atmosphere since. This particular dataset represents measurements taken utilizing automated dual-column electron-capture gas chromatographs which sample the background air about 4 times daily at the following globally distributed sites: Adrigole, Ireland; Cape Meares, Oregon; Ragged Point, Barbados; Cape Matatula, American Samoa; and Cape Grim, Tasmania. Officially ALE ran for the time period from 1978-1981, although data was continued to be logged until 1986 and is available in yearly files either in Ascii (.txt), Ascii decimal date(.dat) or binary file decimal date format(.dat.bin).