(Phys.org) —Earth scientist Dennis Darby is arguing in a Letter article published in Nature Geoscience, that perennial sea ice existed as far back as 44 million years ago. He's developed a technique for dating perennial sea ice that involved analyzing grains of iron oxides found in ice core samples that he claims, date back 26 million more years that current estimates project. He suggests that such grain samples could only be where they are if sea ice existed year round. Catherine Stickley, offers a News & Views Piece in the same journal edition, suggesting that Darby's work could help to more accurately forecast what conditions might be like over the next century as sea ice melts completely every summer.
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