Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326..577g&link_type=abstract
Nature (ISSN 0028-0836), vol. 326, April 9, 1987, p. 577-580. FNRS-supported research.
Astronomy and Astrophysics
Astronomy
6
Astronomical Models, Climatology, Formations, Planetary Evolution, Solar Activity Effects, Solar Cycles, Atmospheric Temperature, Precambrian Period, Solar Terrestrial Interactions, Temperature Distribution
Scientific paper
A radiative-convective-photochemical model is used to investigate the sensitivity of the global surface temperature to change in the UV solar irradiance, and the implications of the results for the Elatina Formation are considered. It is shown that the response maximizes for an O2 atmospheric content of 0.003, the present atmospheric level. Two alternative hypotheses about the UV variability are examined. In the first, the solar-cycle variation is restricted to wavelengths below 200 nm. The induced surface temperature fluctuation Delta Ts is very small, except that the amplitude of the UV modulation is enhanced with respect to average values for solar cycle 21. The second hypothesis assumes that the UV variability extends up to 300 nm. In this case, a Delta Ts perturbation of several tenths of kelvin is predicted.
François Louis M.
Gerard J.-Cl.
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