1 tropical savanna climate cause: controlled by the rotation of the equatorial low-pressure belt and the mesmeric belt. The tropical savanna climate is affected by non-zonal factors in a variety of types, with different specific causes。
2. Monsoon
(1) at summer festivals, in low latitudes (especially on the mainland), a western equatorial wind circulation is often inserted in the northern and southern hemispheres of the wind. It was formed as a result of seasonal movement of the bands, on the one hand, and of the heating of the continent, on the other, which contributed to the strengthening of the continent when the equatorial low-pressure tanks moved。
(2) in the summer of the northern hemisphere (july), the south-east monsoon of the southern hemisphere turns north across the equator to the right, forming the south-west monsoon, while in the summer of the southern hemisphere (january), the north-east wind turns southward across the equator to the left, forming the north-west monsoon. This phenomenon is most pronounced in the western pacific, from africa to the indian ocean. Characteristics: high temperatures, dry and wet seasons, dry seasons, and wet seasons. Mainly in sub-saharan africa。
(3) africa 10° n to 20° n and southern north america and northern australia. In the summer, the two sites were controlled by warm, wet monsoons that ran above warm currents and were elevated by the terrain; and the dry season was formed by rising south-west monsoons and north-east monsoon irradiations, with many pairs of rain and abundant precipitation; and winter, by a single dry north-east linson wind。
3. Tropical vanguard
(1) in summer, in the vast eastern tropical pacific, the western equatorial wind is not significant, and the warm and wet monsoons from the pacific have little impact on the savanna climate in south america due to the obstruction of the high andes. However, the south-west monsoon and north-west monsoons from land-based sources corresponded to the north-east monsoon and south-east monsoons from the tropical atlantic and over warm currents, respectively, which rose, forming a tropical stride, with many pairs of rain and humid heat。
(2) the guyana plateau to the north of the equator, the orinoco river basin and the northern part of colombia were humidly wet from june to october, and the interior of the brazilian plateau to the south of the equator was rich in precipitation and wet seasons from october to march. In the winter, the two areas are controlled by a single north-east monsoon and a south-east monsoon, which are dry and rain-free and form a dry season。
4. Sub-high
(1) the southern highlands of south africa (20°s-30°s); the southern hemisphere in january is summer, with a wide range of heat and low pressures within the continent, warm, wet south-east monsoons over the warm currents blowing to the mainland, bringing more precipitation and wet seasons to the south african highlands; and the southern hemisphere in july is winter with an average elevation of over 1,000 metres above sea level, with high terrain, lower temperatures and high pressures in the southern part of the continent, linked to high ocean pressure in the east. The subtropical high-pressure belts control the prevailing downflow. Combined with the presence of high pressure on land, monsoon impacts from the sea are reduced to dry seasons。
(2) southern australia (30°s to 32°s); as a result of the seasonal movement of the global air-pressure belt and wind belt, in the summer (january), the area is controlled by the sub-highs of the southern movement, with a high prevalence of downing and drying, which forms a dry season; and winter (july), which is controlled by wet western wind from the north。
