Computer Science
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320...27h&link_type=abstract
Nature (ISSN 0028-0836), vol. 320, March 6, 1986, p. 27-33.
Computer Science
24
Atmospheric Chemistry, Chemical Evolution, Earth Atmosphere, Marine Chemistry, Oceans, Atmospheric Composition, Carbon Dioxide, Geochemistry, Schist, Sea Water, Shales, Sodium Chlorides
Scientific paper
The ocean-atmosphere system of the present and distant past are compared. The reservoirs and residence times of atmospheric and oceanic constituents and their input, output, and control mechanisms are discussed, showing that the residence times are small fractions of the age of the earth and that the rate of output is generally nearly equal to the rate of input. A number of these dynamic equilibria are being disturbed quite severely, especially the partial pressure of CO2. The major components of sea water, the isotopic composition of solutes in sea water, trace elements in sea water, and the atmospheric oxygen and CO2 through the earth's history are discussed. No drastic changes have occurred in the composition of sea water during the last 900 Myr. The chemistry of soils formed more than 1000 Myr ago suggests that the atmosphere then contained significantly more CO2 and less O2 than at present. Hydrogen peroxide may have been the principal oxidant and formaldehyde the main reductant in rain water between 3000 and 1000 Myr ago.
Holland Heineich D.
Lazar Brian
McCaffrey M.
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