Near-sea breeze refers to the wind blowing from land to water in coastal areas. Offshore wind easily causes seawater to leave the coast, causing seawater to flow out of the passing waters and flood the deep water. In addition, offshore winds will cause upwelling. The strong prevailing wind blows from land to sea, driving the surface of seawater offshore, and the upper seawater is missing. In addition to the replenishment of the surrounding seawater, seabed seawater often overflows (rises). The cold current (upwelling) in Peru is formed under the influence of southeast wind (offshore wind). The prevailing wind blows the sea surface and pushes the sea water to drift with the wind, which is the most important form of ocean current. Moreover, it is to let the upper seawater drive the lower seawater to flow and form a large-scale ocean current, which is called wind ocean current.
The Peruvian cold current belongs to the upwelling caused by offshore wind.