This wandering may affect the positioning of the North African Summer Monsoon Front and thus impact the perceived strength of the North African Monsoon. [3][4], The idea that changes in insolation caused by shifts in the Earth's orbital parameters are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century,[5] The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. Like obliquity, eccentricity is not considered to be a primary driver of the strength of the North African Monsoon. Then it goes into cellular respiration and back into the atmosphere. [2] The precession of the equinoxes is regarded as the most important orbital parameter in the formation of the "green Sahara" and "desert Sahara" cycle. Large rivers in the region included the Senegal River, Nile River, Sahabi River, and Kufra River. When the North African Monsoon is at its strongest, annual precipitation and consequently vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green … Carbon is also in the process of photosynthesis. Plants take up phosphorus through their roots only when it is dissolved in water. [2][7][8] The relationship between the precession cycle and the strength of the North African Monsoon exists because procession affects the amount of insolation received in a given hemisphere. PHOTO: http://travelandtourismtoday.blogspot.com/2011/05/sahara-desert-hottest-desert-in-world.html, The Nitrogen Cycle describes the routes that nitrogen atoms take through the environment.The nitrogen cycle relies on bacteria that make nitrogen useful to organisms and bacteria that can return it to the atmosphere. [5], Sapropels are dark organic rich marine sediments that contain greater than 2% organic carbon by weight. So to account for these rapid shifts in the climate of the Sahara, several nonlinear feedback mechanisms have been proposed. [5], Modulation of the precession driven insolation cycle is the primary impact of obliquity on the North African Monsoon. For example, when the orbit of the Earth is highly elliptical one hemisphere will have hot summers and cold winters, corresponding to a larger than average yearly insolation gradient. [16] The proof that this pattern of periodic weakening of the eastern equatorial Atlantic upwelling exists is found in deposits of surface dwelling planktic organisms in ocean sediment cores. When the North African Monsoon is at its strongest, annual precipitation and consequently vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green Sahara". In this cycle soil has phosphorus and it is uptake and it goes into the land plants and then into the consumers and then to the decomposers and keeps doing that. Shares. The amount of insolation is maximized for the northern hemisphere when the precession cycle is aligned such that the northern hemisphere points toward the sun at perihelion. One of the most common sets of nonlinear feedback mechanisms considered, are vegetation-atmosphere interactions. Geologic evidence from the beginning and end of the African Humid Period suggests that both the onset and termination of the African Humid Period were abrupt. Therefore, the formation of sapropels must be linked to fresh water discharge from the Nile River and not melt water from dissipating ice sheets. North African climate cycles have a unique history that can be traced back millions of years. If you go to a desert, it is very rare to find a cloud. The majority of the Sahara region for instance was characterized by expansive grasslands, also known as steppe. As a result of this gradient the strength of the North African Monsoon increases. Values of summer insolation are more important for a region's climate than winter values.

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