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Heat is transported through the ocean by a deep-ocean circulation system, known as the global heat conveyor belt, which constantly circulates water around the globe and helps to balance the earth's climate.
One of the upper branches of this conveyor belt, known as the Indonesian Throughflow (ITF), is an ocean current that flows through various channels between Borneo and New Guinea, more than 9,000 miles from Delaware.
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While many of these channels have been known to researchers for years, the University of Delaware's Xiao-Hai Yan research team has uncovered a previously unaccounted for pathway transporting heat from the Pacific Ocean to the Indian Ocean, and even further to the Southern Ocean, which surrounds Antarctica.
A recent study, using models and data from 2003-2012 by Yan and colleagues at Princeton University, Xiamen University and University of Texas at Austin, revealed the warm water may be taking a shortcut in the Eastern Indian Ocean along the western coast of Australia. This warm water makes its way to the Southern Ocean more quickly than previously known or reported—revealing an important link between the Indo-Pacific Ocean and the Southern Ocean during a La Ninã weather pattern, which is the cooling down of the Pacific Ocean along the equator.
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"When heat flows from the Pacific into the Indian Ocean, we expect that heat to follow the south equatorial current from the Indonesian Throughflow down to the eastern coast of Africa," said Yan, the Mary A.S. Lighthipe Professor in Marine Studies and director of UD's Center for Remote Sensing in the College of Earth, Ocean, and Environment. "Instead, the data and model results showed that the abnormally warm water traveled closer to Western Australia, suggesting that other processes were driving the water southward."
This increased transfer of warm water to the south has important climate consequences, Liao, a co-author from Princeton...
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