Milankovitch cycles (orbital periods of the earth)

Range Table - link years
Organism Biosphere
Reference Duursma EK, Boisson MPRM, Global oceanic and atmospheric oxygen stability considered in relation to the carbon-cycle and to different time scales. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 2 , P. 117-141 link p.137 figure 15
Primary Source Degens E. T. (1989). Perspectives on Biogeochemistry. Springer Verlag, Heidelberg, Germany, 423 pp AND de Boer P.L. (1990/1991 ). Astronomical cycles reflected in sediments. Zentbl. Geol. Palaont., 1, 8, 911-930 and please see ref beneath figure
Comments P.136 right column bottom paragraph: "It appears that the main factors influencing climate within a time frame of 10,000 to 100,000 years are the orbital periods of the earth. These so-called Milankovitch cycles (Fig. 15) are related to the periods in the precession of the earth's axis (21,000 years), the tilt angle or obliquity of the rotation axis of the earth (41,000 years), and the eccentricity of its orbit (100,000 years, primary sources). The result is that the present average solar radiation, which is for 50° N at the level of 35,500 kJ/m^2/day, can fluctuate between 34,000 and 38,000 kJ/m^2/day. The range between maximum and minimum solar radiation is 10 % of the present-day radiation."
Entered by Uri M
ID 116127