What effect does ocean current have on the climate in South America?

The east and west sides of the South American continent are respectively affected by the Brazilian warm current and the Peruvian cold current.

The Guyana Warm Current, which diverges from the northern part of the east coast, flows northwest along the coast, making the weather near the mouth of the Amazon River and the coastal areas of Guyana and Venezuela hot and humid. The Brazilian warm current from the southern branch of the east coast flows southward to the mouth of the La Plata River, which raises the coastal temperature and produces abundant precipitation.

On the west coast, there is a strong Peruvian cold current flowing northward, almost reaching the equator, causing the coastal temperature to drop, resulting in inversion and low-level fog, making it difficult to form convective rain. Therefore, there is a lack of precipitation, and an arid Atacama desert is formed between 20 and 30 degrees south latitude. The west coast north of 6 south latitude is affected by warm and humid equatorial countercurrent, and the water temperature is high. When this high warm current meets the cold current in southern Peru, it is easy to cause airflow convergence.