Changes in the atmospheric helium isotope ratio over the past 40 years
作者： J. Lupton , L. Evans
DOI: 10.1002/2013GL057681
关键词:
摘要: [1] We have compared the helium isotope ratio in five samples of Pacific marine air spanning 40 year period between 1973 and 2013 against a secondary gas standard. In separate experiment we directly 3He/4He collected at same location La Jolla, California, eliminating any geographical bias. Both experiments are consistent with zero time rate change for atmospheric 3He/4He. Our best estimate is −0.0014 ± 0.0045%/yr (2σ), indicating that still valid standard terrestrial measurements.
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