Other
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3113101l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 13, CiteID L13101
Other
5
Geochemistry: Isotopic Composition/Chemistry, Meteorology And Atmospheric Dynamics: General Or Miscellaneous, Information Related To Geographic Region: Europe, General Or Miscellaneous: Instruments Useful In Three Or More Fields
Scientific paper
We have compared the helium isotope ratio of samples of Pacific marine air collected over the 30-year period from 1973 to 2003 against a secondary geothermal gas standard and also against a running air standard. The results are consistent with zero rate of change for atmospheric 3He/4He. When the errors are taken into account, the rate of change in the air 3He/4He ratio is between -0.0102 and +0.0019 %/year. At the most this corresponds to a 0.3% change in the air 3He/4He ratio over the past 3 decades, which is at or below the detection limit of most laboratories. While there may be a small decrease in air 3He/4He due to anthropogenic release of 4He associated with use of fossil fuels, this decrease is not large enough to prevent the use of air helium as an isotopic standard.
Evans Leigh
Lupton John
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