Wednesday, December 19th, 2018

New study clears up Greenland climate puzzle

A boat skims through the melting ice in the Ilulissat fjord, on the western coast of Greenland, on August 28, 2008Greenland began heating up around 19,000 years ago at the end of the last ice age, just like the rest of the northern hemisphere, researchers said in a report that resolves a paradox over when that warming happened. Then, changes in the Earth's orbit around the sun increased solar energy reaching Greenland beginning some 19,000 years ago, causing the release of carbon from the deep ocean. This led to a gradual rise in atmospheric carbon dioxide (CO2). In the past, studies of ice cores from Greenland did not show any warming response as would be expected from an increase in CO2 and solar energy flux, said lead author Christo Buizert of Oregon State University.

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