 Posted: Tue 21:10, 19 Nov 2013 Post subject: human-produced |
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| British scientific expedition of more than a century ago studied
PASADENA, Calif., May 28 () -- Data from a British scientific expedition more than a century ago has confirmed human activities have warmed our planet over the past century,[url=http://www.christianslouboutinsales.com]Christian Louboutin Men[/url], researchers say.Researchers from the University of Tasmania in Australia and NASA's Jet Propulsion Laboratory in Pasadena, Calif., have analyzed ocean data collected by the crew of the HMS Challenger from 1872 to 1876 in the world's first global scientific survey of the oceans.Scientists with the expedition measured ocean temperatures by lowering thermometers hundreds of feet deep on ropes.The ship's measurements of ocean temperatures have been combined with modern observations from an international array of ocean profiling floats to create state-of-the-art climate models, a JPL release reported.Uncertainties in Challenger's measurements were caused by the limited areas measured during the voyage, the actual depths the thermometers descended to and the likely natural variation in temperature that could occur in each region during the voyage, researchers said.But analysis showed the usefulness of the Challenger data, the researchers said."After we had taken all these uncertainties into account, it became apparent that the rate of warming we saw across the oceans far exceeded the degree of uncertainty around the measurements," JPL climate scientist Josh Willis said. "So, while the uncertainty was large, the warming signal detected was far greater."The data confirmed the warming trend of more than a century, researchers said."Our research revealed warming of the planet can be clearly detected since 1873 and that our oceans continue to absorb the great majority of this heat," Will Hobbs of the University of Tasmania said."Currently,[url=http://www.christianslouboutinsales.com]Christian Louboutin Black[/url], scientists estimate the oceans absorb more than 90 percent of the heat trapped by greenhouse gases, and we attribute the global warming to anthropogenic (human-produced) causes." |
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