(This March 13 story has been corrected to fix how much the oceans have warmed up by in paragraph 7)
(Reuters) - Heatwaves unfolding on the bottom of the ocean can be more intense and last longer than those on the sea surface, new research suggests, but such extremes in the deep ocean are often overlooked.
A team of scientists with the U.S. National Oceanic and Atmospheric Administration have conducted the first assessment of marine heatwaves along North America's continental shelves.
