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Title:
Helium concentration in the earth's lower atmosphere
Authors:
Oliver, B. M.; Bradley, James G.; Farrar, Harry
Affiliation:
AA(Rockwell International Corp., Canoga Park, CA), AB(Rockwell International Corp., Canoga Park, CA), AC(California Institute of Technology, Jet Propulsion Laboratory, Pasadena; Rockwell International Corp., Canoga Park, CA)
Publication:
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, Sept. 1984, p. 1759-1767. (GeCoA Homepage)
Publication Date:
09/1984
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
Atmospheric Composition, Helium Isotopes, Lower Atmosphere, Air Sampling, Mass Spectroscopy
DOI:
10.1016/0016-7037(84)90030-9
Bibliographic Code:
1984GeCoA..48.1759O

Abstract

A helium content of 5.222 + or - 0.017 ppm by volume has been established by measurements during 1981 of the earth's lower atmosphere, using isotope dilution mass spectrometry. This compares well with the currently accepted value of 5.239 + or - 0.004 ppm determined by Gluekhauf (1946) on the basis of measurements conducted in the 1930s. While processes that could have altered helium concentrations since the 1930s imply a significant increase in concentration, due to helium release during natural gas production, possible net helium losses from the atmosphere are not easily quantifiable.
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Physics
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