Problems Related to Interplanetary Matter (1961) / Chapter Skim
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SECULAR CHANGES IN THE CONCENTRATION OF ATMOSPHERIC RADIOCARBON
SECULAR CHANGES IN THE CONCENTRATION OF ATMOSPHERIC RADIOCARBON
Pages 90-95
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From page 90... ...
Further observations by European workers were discussed during the last radiocarbon conference in Groningen in 1959. These observations were made on tree rings of the sequoia gigantea from the British Museum dating back about 1500 years.
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From page 91... ...
Theoretically one can expect that the average climate of the Earth will affect the Cl4 activity in two different ways which will tend to cancel each other. One is the increased downward mixing of surface ocean water because of a weaker thermocline in higher latitudes during periods of cold weather.
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From page 92... ...
Straight line represents decay line of Cl4 assuming 5568 years half-life. The changes in the cosmic ray flux can be due to changes in (1)
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From page 93... ...
Solid circles show values by Broecker et al. for comparison.
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From page 94... ...
and by other investigators as 11, 350 years old, may actually be some 12, 500 years old; or the maximum extent of the North American ice sheet during the last glaciation measured by the author (Suess 1954) to have occurred between eighteen and nineteen thousand radiocarbon years ago may actually have been reached twenty to twenty-one thousand years ago.
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From page 95... ...
(1955) Radiocarbon Dating (University of Chicago Press, Chicago)
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