Climate Change in the African Prairie

The climate of savanna in Africa has obvious dry season and rainy season in a year, and the annual rainfall is between 500 ~ 1 000 mm, mostly concentrated in the rainy season. In dry season, the temperature is higher than that in tropical rain forest area, and the daily average temperature is between 24℃ and 30℃. Generally, the continental depression moves northward from May to 10 every year. At this time, the southwest monsoon blowing from the Gulf of Guinea (also known as Guinea monsoon) prevailed in the tropical grassland in the northern hemisphere, bringing abundant precipitation and forming the rainy season. From June 165438+ 10 to April of the following year, the continental depression moved southward, and the trade winds (Hamadan winds) from the subtropical high area prevailed in the tropical grasslands in the northern hemisphere, which was very dry and formed a dry season. The wet and dry seasons of savanna in the southern hemisphere are just the opposite to those in the northern hemisphere.

East African Plateau, with high altitude. Because of the high terrain and low temperature, the air pressure will not be too low, but the updraft is weak and it is not easy to cause rainfall. At the same time, the low temperature makes the water vapor content in the air less, so the temperature and precipitation can't meet the standards of tropical rain forest, so it becomes a savanna climate. The East African Plateau is alternately controlled by the equatorial low pressure zone and the trade winds. It is not controlled by equatorial low all the year round, so from June to June every year, 10, the pressure belt and wind belt move northward, and the rainy season in some parts of the East African Plateau in the northern hemisphere is controlled by equatorial low, while the rainy season in some parts of the southern hemisphere is affected by trade winds. 1 1 By May of the following year, it was just the opposite.