a set of changes in the weather system near the coast of northern Peru and Ecuador that happens every few years, causing the surface of the Pacific Ocean there to become warmer and having severe effects on the weather in many parts of the world compare La Niña (1)厄尔尼诺现象,圣婴现象(南美洲西海岸每隔数年一次的海温升高现象,导致太平洋水温上升,严重影响全球多处气候)