Aeronomy by P. M. Banks and G. Kockarts (Auth.)
By P. M. Banks and G. Kockarts (Auth.)
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56. G. A. Lane and M. Dole, Science 123, 574 (1956). 1 Introduction Thirty years ago it was generally accepted that the composition of the stratospheric air varied with altitude because it was believed that helium and oxygen samples taken above 20 km showed departures from a mixing distribution toward partial diffusive separation. Today one must conclude that the relative helium content is the same in the stratosphere as at ground level. Furthermore, it seems safe to conclude that gases which are sufficiently inert chemically do not exhibit changes in relative abundance below the thermosphère.
8 The net uncertainty in these quantities is probably of the order of ± 5 0 % . in deep sea regions where mantle convection occurs. Recent data  indicate substantial increases in seawater 3He concentrations near crust upwellings which presumably expose 3He accumulated during primeval periods. 5 is correct. It follows, however, that in some manner the atmospheric 3 He content is renewed every 400,000 years. The solar spectrum indicates that the 13C molecule is sufficiently abundant to be detected in the infrared 2 μνη band of 1 3 C0 2 .
32 2 The Composition of the Homosphere 23. R. H. Bieri, M. Koide, E. A. Martell, and T. G. Scholz, / . Geophys. Res. 75, 6731 (1970). 24. D. Q. Wark and D. T. Hilleary, Science 165, 1256 (1969). 25. B. J. Conrath, R. A. Hanel, V. G. Kunde, and C. Prabhakara, / . Geophys. Res. 75, 5831 (1970). 26. C. D. Keeling, Tellus 12, 200 (1960). 27. B. Bolin and C. D. Keeling, / . Geophys. Res. 68, 3899 (1963). 28. L. Goldberg, in The Solar System, Vol. II, The Earth as a Planet (G. P. ), pp. 434-490. Univ.