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The major monsoon systems of the world consist of the West African, Asian–Australian, the North American, and South American monsoons. The term was first used in English in British India and neighboring countries to refer to the big seasonal winds blowing from the Bay of Bengal and Arabian Sea in the southwest bringing heavy rainfall to the area.
The African humid period was caused by a stronger West African Monsoon [125] directed by changes in solar irradiance and in albedo feedbacks. [17] These led to increased moisture import from both the equatorial Atlantic into West Africa, as well as from the North Atlantic and the Mediterranean Sea towards the Mediterranean coasts of Africa. [126]
In doing so, they leave East Africa unusually dry for its latitude. [19] Low-level southwesterlies emanating from the Gulf of Guinea are the key moisture source for the West African monsoon in northern hemisphere summer. [20] The Tropical Easterly Jet, which forms high up in the atmosphere, 15–17 km above the surface, is another important factor.
A monsoon is a shift in seasonal wind pattern that brings on a very rainy period. ... And by the fall, winds will start shifting out of the west, which brings drier conditions to the region.
Rainfall north of the equator in Africa typically increases from July through September as the West African Monsoon kicks into gear. ... normal conditions in the wet portions of West and Central ...
The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. [1] Generally, the season lasts at least one month. [ 2 ]
Klutse studies climate dynamics of West Africa. Her work focuses on climate science and development specifically on the African monsoon. [3] [4] She is Professor and the Head of the Department of Physics, University of Ghana. [5] In the past, she managed the Remote Sensing and Climate Centre. [6]
In 15,000 BP, the West African Monsoon transformed the landscape of Africa and began the Green Sahara period; greater rainfall during the summer season resulted in the growth of humid conditions (e.g., lakes, wetlands) and the savanna (e.g., grassland, shrubland) in North Africa. [22] Between 5500 BP and 4000 BP, the Green Sahara period ended. [22]