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Air Pressure and Air Density One Atmospheric Pressure
Air Pressure and Air Density One Atmospheric Pressure

... The Orbital Monsoon Hypothesis ‰ The 23,000-year cycle of orbital procession increases (decreases) summer insolation and at the same time decreases (increases) winter insolation at low and middle latitudes. ‰ Departures from the modern seasonal cycle of solar radiation have driven stronger monsoon c ...
Name:__________________ Date: Pre
Name:__________________ Date: Pre

... Sun’s apparent paths as viewed by an observer located at 50° N latitude on June 21 and March 21. The data table shows the Sun’s maximum altitude for the same two dates of the year. The Sun’s maximum altitude for December 21 has been left blank. ...
Tectonic Control of CO2
Tectonic Control of CO2

Figure 3
Figure 3

... Changes are related to variations in the orbit of the Earth about the Sun ...
1

North African climate cycles

North African Climate Cycles have a unique history that can be traced back millions of years. The cyclic climate pattern of the Sahara is characterized by significant shifts in the strength of the North African Monsoon. When the North African Monsoon is at its strongest annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the ""green Sahara"". For a relatively weak North African Monsoon the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the ""desert Sahara"".Variations in the climate of the Sahara region can at the simplest level be attributed to the changes in insolation due to slow shifts in Earth’s orbital parameters. These parameters include the precession of the equinoxes, obliquity, and eccentricity as put forth by Milankovitch theory. The precession of the equinoxes is regarded as the most important orbital parameter in the formation of the ""green Sahara"" and ""desert Sahara"" cycle.
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