Explanation:

The Humboldt Current System (HCS), also called the Peru Current, is a major Eastern
Boundary Upwelling Ecosystem that flows north along the western coast of South America.
The Humboldt has a considerable cooling influence on the climate of Chile, Peru and
Ecuador. It is also largely responsible for the aridity of Atacama Desert in northern Chile and
coastal areas of Peru and also of the aridity of southern Ecuador. Marine air is cooled by the
current and thus is not conducive to generating precipitation (although clouds and fog are
produced).