Mathematics – Logic
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72..327b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 72, no. 4, March 1985, p. 327-340.
Mathematics
Logic
31
Climate, Geochemistry, Geochronology, Orbital Elements, Sediments, Atmospheric Circulation, Calcium Carbonates, Earth Planetary Structure, Insolation, Limestone, Precipitation (Meteorology), Solar Radiation
Scientific paper
Studies of cretaceous rhythmic bedding sequences, indicating a plausible link between orbital variations and climate, are considered. It is shown that during warm geologic periods the nature of the link is problematic. Climate model studies show that the intensity of continental margin precipitation in specific regions at low latitudes, is a function of land-sea thermal contrast which is sensitive to orbital variations. Cretaceous climate model simulations are characterized by geographically controlled regions of high precipitation and show that the northern margin of the Tethyan Ocean is characterized by greater sensitivity to orbital variations. Studies of the sediments, geochemistry, and biota of the Greenhorn Cyclothem in the Western Interior Seaway of North America are interpreted as due to variations in rainfall runoff, and stable stratification of the seaway. The proposed link between orbital variability, climate (particularly precipitation regimes), and the geologic record has important implications for the sensitivity of the earth-atmosphere system.
Arthur Michael A.
Barron Eric J.
Kauffman Erle G.
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