Final answer:
La Niña is the global weather phenomenon characterized by unusually cold ocean temperatures in the Equatorial Pacific. It is characterized by an intensification of the normal trade winds and affects weather patterns worldwide.
Step-by-step explanation:
The global weather phenomenon characterized by unusually cold ocean temperatures in the Equatorial Pacific is called La Niña. During La Niña, there is an intensification of the normal trade winds, which leads to an increase in upwelling of cold water along the coast of South America. This cold water affects weather patterns worldwide.
Learn more about La Niña and its impact on global weather patterns