『Abstract
Using the average nitrogen/carbon ratio (N/C) of sedimentary
organic matter, coal, and volcanic/metamorphic gases, existing
models of the carbon cycle have been used to calculate the fluxes
of nitrogen to and from the atmosphere via the weathering, burial,
and metamorphic/volcanic decomposition of organic matter. Results
indicate no appreciable change, less than one percent of that
present, in the mass of atmospheric N2 over
Phanerozoic time. This is in sharp contrast to atmospheric O2, which shows notable variations. Variation of
the mass of O2, but not that of N2,
must have led to variation in total atmospheric pressure with
time. Results are not altered by considering N/C ratios ten times
higher than the average for sedimentary rocks nor by considering
nitrogen release from silicate weathering. The residence time
of N2 in the atmosphere, relative to exchange
with and storage in crust rocks, is estimated to be about one
billion years.
Keywords: atmospheric N2; atmospheric pressure;
nitrogen cycle; Phanerozoic.』
Introduction
Method of calculation
Results
Discussion and conclusions
Acknowledgments
References cited