Are there four seasons at the equator? What is the equatorial countercurrent?

The equator is the longest circular line in the trajectory of points on the earth's surface as the earth rotates. It is a large circle where a plane perpendicular to the earth's axis through the center of the earth intersects the earth's surface. It is the longest latitude circle on the earth. Do you know that there are four seasons at the equator?

Contents of this article

1. Are there four seasons at the equator?

2. What is the equatorial countercurrent?

3. How many kilometers does it take for the Earth to orbit the equator?

Are there four seasons at the equator?

1. There is an angle between the planes of the Earth's orbits of revolution and rotation.

2. The Earth's orbit is approximately an ellipse, and the Sun is roughly near one of its foci.

Therefore, the distance from the sun is different at different times of the earth's revolution. And because of the angle, the intensity of the sun's rays and the angle of the sun's rays in the north and south of the earth are different at different times (the smaller the angle of the sun's rays, the less heat. In this way, there will be different climates in different time periods. The four seasons of the year will also alternate with each other. For the same reason, there is only summer in the tropics because the equator is always under direct sunlight. And the two poles of the earth also have the phenomenon of polar day and polar night for the same reason.

What is the equatorial countercurrent?

The equatorial countercurrent, also known as the anti-equatorial current, refers to the reverse current between the South and North equatorial currents.

The equatorial countercurrent flows from west to east to replenish the seawater carried away by the equatorial current in the eastern ocean, so it has the characteristics of compensatory current and oblique current.

Since it undergoes intense warming and freshening processes throughout the year, the surface water of the equatorial countercurrent has the characteristics of high temperature and low salinity.

The reason for the formation of the equatorial countercurrent: In the northern Indian Ocean, due to the narrow sea area, the northeast trade wind is not very developed, so the seasonal movement of the pressure belt and wind belt, as well as the difference in thermal properties between land and sea, has a dominant position in the tropical monsoon. From October to March and April of the following year, the Asian continent is shrouded in strong high pressure. In the northern Indian Ocean, the northeast monsoon prevails. The seawater in the Bay of Bengal flows southwest, south around Sri Lanka, and together with the seawater flowing southwest in the Arabian Sea, it forms the northeast monsoon ocean current. Subsequently, it flows south along the coast of the Somali Peninsula, forming the Somali Warm Current, and merges with the North Equatorial Warm Current, turning near the equator, and flowing east along the equator to Sumatra, forming a fairly obvious equatorial countercurrent.

How many kilometers does the earth go around the equator?

The equator is the longest circular line in the trajectory of points on the earth's surface as the earth rotates. It is a large circle where a plane perpendicular to the earth's axis passes through the center of the earth and intersects the earth's surface. It is the longest latitude circle on the earth. The equatorial radius is 6378.2 kilometers, the polar radius is 6356.8 kilometers, and the average radius is 6371 kilometers. According to the circumference calculation formula, the circumference is approximately equal to 40075.7 kilometers.