Perform the indicated operations and simplify the expression. 
Definitions:
Seasonal Change
The variation in environmental conditions that occurs over regular periods due to Earth's orbit around the Sun, influencing temperature, weather, and ecosystems.
Sea-Surface Temperatures
The temperature of the ocean's surface, which influences climate and weather patterns.
El Niño
A climatic phenomenon occurring in the Pacific Ocean, characterized by unusually warm ocean temperatures in the Equatorial Pacific, affecting global weather patterns.
Eastern Pacific
A region of the Pacific Ocean bounded by the Americas to the east and the central and western parts of the ocean to the west, known for significant meteorological and oceanographic phenomena.
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