The increase of greenhouses gases in the atmosphere is causing changes in our climate. Perhaps nowhere on Earth is that being felt stronger than the Pacific Ocean. First of all, the ocean is massive -- more than twice the size of the next largest ocean (the Atlantic). It's actually larger than all the land mass of the earth combined. We're talking a big area, folks.
As the temperatures of the air and then consequently the water begin to rise, it creates small changes in a small area. However combine all the small areas into one as large as the Pacific Ocean and you've got a big challenge on your hands.
Climate patterns such as El Niño and La Niña start to become more extreme.
And they start to impact larger areas of the globe. In some cases they stretch all the way across the world in just a matter of days.
as the Pacific warms due to human-driven climate change and temperature gradients across the ocean widen, scientists warn that El Niño and La Niña periods are becoming longer, more extreme, and more frequent.
https://www.popsci.com/environment/pacific-ocean-weather-patterns-climate-change/