Why does the equatorial depression control the prevailing updraft and form a tropical rainforest climate?

Controlled by the equatorial low pressure zone, updraft prevails and air convection forms convective rain; Because it is hot and rainy all the year round, a tropical rainforest climate has been formed.

Tropical rain forest climate is also called "equatorial rainy climate". Mainly distributed between latitudes 10 on both sides of the equator (near the equator). It is hot and rainy all year round, with an average monthly temperature of 25-28℃ and an annual precipitation of over 2000 mm, with even seasonal distribution and no dry season. It mainly appears in Amazon Plain in South America, Congo Basin and Gulf of Guinea in Africa, most parts of Malay Archipelago in Asia and southern Malay Peninsula.

The general trend is mainly influenced by solar radiation in the range of north-south latitude 10 degrees in the equatorial region. (The amount of solar radiation in tropical rain forest climate is generally 10 ~ 180 kcal ~ 2) In the equatorial low-pressure area, the trade winds gather and converge and rise near the equator, and the water vapor contained in them is easy to form clouds and cause rainfall. Climate change is monotonous, and it is summer all year round. It is usually sunny in the morning, hot before noon, rainy in the afternoon, and a little cold in the yellow rain. However, in the same type of region in the world, the tropical evergreen rainforest in the Amazon Plain is not only the most extensive, but also the most fully developed and typical.