Climate models had predicted that ocean circulation would accelerate with unmitigated climate change, but the changes had not been expected until much later this century.
For the new study, the researchers tapped into a network of free-drifting instruments, known as Argo floats, to measure the movement of water up to a depth of 2,000 meters.
Scientists have observed an increase in the intensity of surface winds, combined with a steady rise in greenhouse gas emissions, since the 1990s. But McPhaden said the exact links between increased greenhouse gases and faster ocean currents are still unknown. "Warmer water will generate hurricanes and extreme weather like that, so there are definitely implications from our work," she said."Warming oceans are causing a mass migration, because fish are moving to areas where they can thrive," said Lisa Suatoni, deputy director of the oceans division of the Natural Resources Defense Council, a nonprofit environmental advocacy group.
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