A Japanese scientist who analyzed ocean temperatures stretching back more than five decades has predicted that the climate in the Northern Hemisphere may enter a cooling period around 2015.
Mototaka Nakamura, a senior scientist at the Japan Agency for Marine-Earth Science and Technology, analyzed surface temperatures of the Greenland Sea from 1957 to the present and how they affect climate change.
He said Greenland Sea temperatures could serve as a leading indicator of cooling and warming cycles in North Atlantic waters, which are believed to alternate on about 70-year cycles.
He added that the waters in the Greenland Sea appear to be near the tail end of a warming cycle.
The climate in the Northern Hemisphere had cooled from the 1940s to the 1970s, but began a warming trend in the 1980s.
Nakamura said when predicting climate change, the effects of global warming caused by man-made greenhouse gases also need to be taken into consideration.
His findings were published in a U.S. science journal on June 28.