California scientists are warning that a developing El Niño is heating the Pacific and highlighting a deeper problem in the world’s seas: declining oxygen levels. Their concern, as outlined in the report, is that climate change is reducing a resource marine life depends on to survive.
The warning links this summer’s warmer Pacific conditions to a broader pattern affecting oceans far beyond California. As temperatures rise, researchers say the global ocean is losing oxygen, adding another layer of stress to waters already changing because of the climate.
That matters for coastal ecosystems as well as open water. In California, habitats such as kelp forests — including those near Channel Islands National Park, featured with the story — show what is at stake when ocean conditions shift. Lower oxygen can make already-warming marine environments harder for sea life to tolerate.
With El Niño expected to intensify Pacific heat, scientists are treating this season as a visible sign of a longer-term trend. Their message is that ocean warming is not only about higher temperatures at the surface, but also about a shrinking oxygen supply below it.
