However, a recent study found that heat absorbed by Earths oceans has increased significantly over the same period, prompting the studys co-authors to say the warming has been diverted and is heating the oceans instead of the atmosphere. The study was published in the journal Geophysical Research Letters, a publication of the American Geophysical Union. The current hiatus in atmospheric warming is temporary, said study co-author Kevin Trenberth of the National Center for Atmospheric Research in Boulder, Colo. Global warming is continuing but manifesting itself differently.
Heres how scientists say global warming works: Increasing amounts of carbon dioxide and other gases caused by the burning of the oil, gas and coal that power our world are enhancing the natural greenhouse effect, causing the temperature of the atmosphere and oceans to warm to levels that climate scientists say cannot be linked to natural forces. Over 90 percent of the heat trapped by greenhouse gases winds up warming the oceans, said Josh Willis, a scientist with NASAs Jet Propulsion Laboratory. Oceans cover two-thirds of the Earths surface, so its expected that theyll play a large role in how climate change and global warming play out.
A large chunk of the warmth appears to be settling far down in the ocean, about a half-mile beneath the surface, Trenberth said. New technology over the past decade or so has allowed scientists to better measure the temperature of the deep oceans, Willis said. Although Earths excess heat comes from climate change, the amount thats absorbed into the oceans (as opposed to staying in the atmosphere) appears to be because of natural changes in climatic wind and ocean patterns, according to the study. Temporary pauses and restarts in atmospheric temperature shouldnt detract from the main story, Willis said. The planet is warming, climate change is happening, and the primary cause is greenhouse gases released by human activities, he added.
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