venerdì 1 novembre 2013

Is global heating hiding out in the oceans? Parts of Pacific warming 15 times faster than in past 10,000 years

Is global heating hiding out in the oceans? Parts of Pacific warming 15 times faster than in past 10,000 years



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Is global heating hiding out in the oceans? Parts of Pacific warming 15 times faster than in past 10,000 years



In a reconstruction of Pacific Ocean temperatures in the last 10,000 years, researchers have found that its middle depths have warmed 15 times faster in the last 60 years than they did during apparent natural warming cycles in the previous 10,000.



via ScienceDaily: Top Science News:


Oct. 31, 2013 — A recent slowdown in global warming has led some skeptics to renew their claims that industrial carbon emissions are not causing a century-long rise in Earth’s surface temperatures. But rather than letting humans off the hook, a new study in the leading journal Science adds support to the idea that the oceans are taking up some of the excess heat, at least for the moment. In a reconstruction of Pacific Ocean temperatures in the last 10,000 years, researchers have found that its middle depths have warmed 15 times faster in the last 60 years than they did during apparent natural warming cycles in the previous 10,000.”We’re experimenting by putting all this heat in the ocean without quite knowing how it’s going to come back out and affect climate,” said study coauthor Braddock Linsley, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory. “It’s not so much the magnitude of the change, but the rate of change.”In its latest report, released in September, the UN’s Intergovernmental Panel on Climate Change (IPCC) noted the recent slowdown in the rate of global warming. While global temperatures rose by about one-fifth of a degree Fahrenheit per decade from the 1950s through 1990s, warming slowed to just half that rate after the record hot year of 1998. The IPCC has attributed the pause to natural climate fluctuations caused by volcanic eruptions, changes in solar intensity, and the movement of heat through the ocean. Many scientists note that 1998 was an exceptionally hot year even by modern standards, and so any average rise using it as a starting point would downplay the longer-term warming trend.The IPCC scientists agree that much of the heat that humans have put into the atmosphere since the 1970s through greenhouse gas emissions probably has been absorbed by the ocean. However, the findings in Science put this idea into a long-term context, and suggest that the oceans may be storing even more of the effects of human emissions than scientists have so far realized. “We may have underestimated the efficiency of the oceans as a storehouse for heat and energy,” said study lead author, Yair Rosenthal, a climate scientist at Rutgers University. …


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Is global heating hiding out in the oceans? Parts of Pacific warming 15 times faster than in past 10,000 years


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Is global heating hiding out in the oceans? Parts of Pacific warming 15 times faster than in past 10,000 years


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