Why does the Amazon basin have a tropical rainforest climate and a lot of rainfall?

Climatic reasons: Amazon basin is located in the low-pressure control area on both sides of the equator, with large solar elevation angle, strong solar radiation on the ground and more convective rainfall.

Tropical rain forest is affected by many factors, and its dominant factors are still different. 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, the tropical evergreen rainforest in the Amazon Plain is not only the most extensive in the world, but also the most fully developed and typical. This is because the geographical location of the Amazon Plain is that the equator passes through it, and the topographical structure is that there are Guiana Plateau in the north, Brazil Plateau in the south and Andes in the west, just like a chair, which is low in the east and high in the west, and is open to receive the abundant warm and humid airflow of the Amazon rainforest brought by the northeast and southeast trade winds and the warm current of the north and south equator. On the other hand, it has a long history of development and relatively stable natural geographical conditions during its formation. The Amazon River is the second longest river in the world. It runs through South America from west to east, with a drainage area of 6 million square kilometers and covered with dense jungle. The mainstream of the Amazon River sometimes floods and floods thousands of square kilometers of forest land. It is the river with the largest runoff in the world, and its comprehensive characteristics are very obvious.

Rainfall reason: The main feature of tropical rain forest climate is high temperature all the year round, and the temperature changes little. The sun shines directly on the ground twice a year, with strong radiation, and there is little difference between day and night. The average temperature of each month in a year is between 24-28℃, the average temperature in Leng Yue is not lower than 18℃, and the absolute maximum temperature rarely exceeds 35℃. The annual temperature difference is generally less than 5℃, and the daily temperature difference can reach 10- 15℃. It rains all year round.

The trade winds in the northern and southern hemispheres converge and rise in the equatorial region, and the ground wind is weak, so the humid airflow is easy to form clouds and cause rainfall. It is humid all year round, and the relative humidity is relatively high. The annual precipitation is generally1500-3000mm. Climate change is monotonous. Under the control of equatorial air mass, 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.

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